mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-07-03 02:10:50 +02:00
minor portability fixes; printf now uses double for floating point conversions by default in posix mode
This commit is contained in:
Chet Ramey
+203
-184
@@ -1,9 +1,9 @@
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This is bash.info, produced by makeinfo version 6.8 from bashref.texi.
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This text is a brief description of the features that are present in the
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Bash shell (version 5.2, 5 February 2022).
|
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Bash shell (version 5.2, 11 April 2022).
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||||
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This is Edition 5.2, last updated 5 February 2022, of 'The GNU Bash
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This is Edition 5.2, last updated 11 April 2022, of 'The GNU Bash
|
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Reference Manual', for 'Bash', Version 5.2.
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Copyright (C) 1988-2022 Free Software Foundation, Inc.
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@@ -26,10 +26,10 @@ Bash Features
|
||||
*************
|
||||
|
||||
This text is a brief description of the features that are present in the
|
||||
Bash shell (version 5.2, 5 February 2022). The Bash home page is
|
||||
Bash shell (version 5.2, 11 April 2022). The Bash home page is
|
||||
<http://www.gnu.org/software/bash/>.
|
||||
|
||||
This is Edition 5.2, last updated 5 February 2022, of 'The GNU Bash
|
||||
This is Edition 5.2, last updated 11 April 2022, of 'The GNU Bash
|
||||
Reference Manual', for 'Bash', Version 5.2.
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||||
|
||||
Bash contains features that appear in other popular shells, and some
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||||
@@ -1367,9 +1367,17 @@ status; otherwise the function's return status is the exit status of the
|
||||
last command executed before the 'return'.
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||||
|
||||
Variables local to the function may be declared with the 'local'
|
||||
builtin. These variables are visible only to the function and the
|
||||
commands it invokes. This is particularly important when a shell
|
||||
function calls other functions.
|
||||
builtin ("local variables"). Ordinarily, variables and their values are
|
||||
shared between a function and its caller. These variables are visible
|
||||
only to the function and the commands it invokes. This is particularly
|
||||
important when a shell function calls other functions.
|
||||
|
||||
In the following description, the "current scope" is a currently-
|
||||
executing function. Previous scopes consist of that function's caller
|
||||
and so on, back to the "global" scope, where the shell is not executing
|
||||
any shell function. Consequently, a local variable at the current local
|
||||
scope is a variable declared using the 'local' or 'declare' builtins in
|
||||
the function that is currently executing.
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||||
|
||||
Local variables "shadow" variables with the same name declared at
|
||||
previous scopes. For instance, a local variable declared in a function
|
||||
@@ -1414,11 +1422,12 @@ script displays
|
||||
variable is local to the current scope, 'unset' will unset it; otherwise
|
||||
the unset will refer to the variable found in any calling scope as
|
||||
described above. If a variable at the current local scope is unset, it
|
||||
will remain so until it is reset in that scope or until the function
|
||||
returns. Once the function returns, any instance of the variable at a
|
||||
previous scope will become visible. If the unset acts on a variable at
|
||||
a previous scope, any instance of a variable with that name that had
|
||||
been shadowed will become visible.
|
||||
will remain so (appearing as unset) until it is reset in that scope or
|
||||
until the function returns. Once the function returns, any instance of
|
||||
the variable at a previous scope will become visible. If the unset acts
|
||||
on a variable at a previous scope, any instance of a variable with that
|
||||
name that had been shadowed will become visible (see below how
|
||||
'localvar_unset'shell option changes this behavior).
|
||||
|
||||
Function names and definitions may be listed with the '-f' option to
|
||||
the 'declare' ('typeset') builtin command (*note Bash Builtins::). The
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||||
@@ -1867,11 +1876,11 @@ omitted, the operator tests only for existence.
|
||||
'${PARAMETER:OFFSET:LENGTH}'
|
||||
This is referred to as Substring Expansion. It expands to up to
|
||||
LENGTH characters of the value of PARAMETER starting at the
|
||||
character specified by OFFSET. If PARAMETER is '@', an indexed
|
||||
array subscripted by '@' or '*', or an associative array name, the
|
||||
results differ as described below. If LENGTH is omitted, it
|
||||
expands to the substring of the value of PARAMETER starting at the
|
||||
character specified by OFFSET and extending to the end of the
|
||||
character specified by OFFSET. If PARAMETER is '@' or '*', an
|
||||
indexed array subscripted by '@' or '*', or an associative array
|
||||
name, the results differ as described below. If LENGTH is omitted,
|
||||
it expands to the substring of the value of PARAMETER starting at
|
||||
the character specified by OFFSET and extending to the end of the
|
||||
value. LENGTH and OFFSET are arithmetic expressions (*note Shell
|
||||
Arithmetic::).
|
||||
|
||||
@@ -1939,11 +1948,11 @@ omitted, the operator tests only for existence.
|
||||
$ echo ${array[0]: -7:-2}
|
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bcdef
|
||||
|
||||
If PARAMETER is '@', the result is LENGTH positional parameters
|
||||
beginning at OFFSET. A negative OFFSET is taken relative to one
|
||||
greater than the greatest positional parameter, so an offset of -1
|
||||
evaluates to the last positional parameter. It is an expansion
|
||||
error if LENGTH evaluates to a number less than zero.
|
||||
If PARAMETER is '@' or '*', the result is LENGTH positional
|
||||
parameters beginning at OFFSET. A negative OFFSET is taken
|
||||
relative to one greater than the greatest positional parameter, so
|
||||
an offset of -1 evaluates to the last positional parameter. It is
|
||||
an expansion error if LENGTH evaluates to a number less than zero.
|
||||
|
||||
The following examples illustrate substring expansion using
|
||||
positional parameters:
|
||||
@@ -6660,6 +6669,10 @@ negative number, that number is interpreted as relative to one greater
|
||||
than the maximum index of NAME, so negative indices count back from the
|
||||
end of the array, and an index of -1 references the last element.
|
||||
|
||||
The '+=' operator will append to an array variable when assigning
|
||||
using the compound assignment syntax; see *note Shell Parameters::
|
||||
above.
|
||||
|
||||
Any element of an array may be referenced using '${NAME[SUBSCRIPT]}'.
|
||||
The braces are required to avoid conflicts with the shell's filename
|
||||
expansion operators. If the SUBSCRIPT is '@' or '*', the word expands
|
||||
@@ -7235,7 +7248,12 @@ startup files.
|
||||
'read', the trap handler executes and 'read' returns an exit status
|
||||
greater than 128.
|
||||
|
||||
60. Bash removes an exited background process's status from the list
|
||||
60. The 'printf' builting uses 'double' (via 'strtod') to convert
|
||||
arguments corresponding to floating point conversion specifiers,
|
||||
instead of 'long double' if it's available. The 'L' length
|
||||
modifier forces 'printf' to use 'long double' if it's available.
|
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|
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61. Bash removes an exited background process's status from the list
|
||||
of such statuses after the 'wait' builtin is used to obtain it.
|
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|
||||
There is other POSIX behavior that Bash does not implement by default
|
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@@ -8156,12 +8174,13 @@ Variable Settings
|
||||
non-incremental history searches. The default is 'On'.
|
||||
|
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'enable-bracketed-paste'
|
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When set to 'On', Readline will configure the terminal in a
|
||||
way that will enable it to insert each paste into the editing
|
||||
buffer as a single string of characters, instead of treating
|
||||
each character as if it had been read from the keyboard. This
|
||||
can prevent pasted characters from being interpreted as
|
||||
editing commands. The default is 'On'.
|
||||
When set to 'On', Readline configures the terminal to insert
|
||||
each paste into the editing buffer as a single string of
|
||||
characters, instead of treating each character as if it had
|
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been read from the keyboard. This is called putting the
|
||||
terminal into "bracketed paste mode"; it prevents Readline
|
||||
from executing any editing commands bound to key sequences
|
||||
appearing in the pasted text. The default is 'On'.
|
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|
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'enable-keypad'
|
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When set to 'on', Readline will try to enable the application
|
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@@ -11967,14 +11986,14 @@ D.3 Parameter and Variable Index
|
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* enable-bracketed-paste: Readline Init File Syntax.
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(line 185)
|
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* enable-keypad: Readline Init File Syntax.
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(line 193)
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(line 194)
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* ENV: Bash Variables. (line 279)
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* EPOCHREALTIME: Bash Variables. (line 284)
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* EPOCHSECONDS: Bash Variables. (line 292)
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* EUID: Bash Variables. (line 299)
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* EXECIGNORE: Bash Variables. (line 303)
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* expand-tilde: Readline Init File Syntax.
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(line 204)
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(line 205)
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* FCEDIT: Bash Variables. (line 316)
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* FIGNORE: Bash Variables. (line 320)
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* FUNCNAME: Bash Variables. (line 326)
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@@ -11988,15 +12007,15 @@ D.3 Parameter and Variable Index
|
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* HISTFILESIZE: Bash Variables. (line 402)
|
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* HISTIGNORE: Bash Variables. (line 413)
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* history-preserve-point: Readline Init File Syntax.
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(line 208)
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(line 209)
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* history-size: Readline Init File Syntax.
|
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(line 214)
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(line 215)
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* HISTSIZE: Bash Variables. (line 433)
|
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* HISTTIMEFORMAT: Bash Variables. (line 440)
|
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* HOME: Bourne Shell Variables.
|
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(line 13)
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* horizontal-scroll-mode: Readline Init File Syntax.
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(line 223)
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(line 224)
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* HOSTFILE: Bash Variables. (line 448)
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* HOSTNAME: Bash Variables. (line 459)
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* HOSTTYPE: Bash Variables. (line 462)
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@@ -12004,13 +12023,13 @@ D.3 Parameter and Variable Index
|
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(line 18)
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* IGNOREEOF: Bash Variables. (line 465)
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* input-meta: Readline Init File Syntax.
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(line 232)
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(line 233)
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* INPUTRC: Bash Variables. (line 475)
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* INSIDE_EMACS: Bash Variables. (line 479)
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* isearch-terminators: Readline Init File Syntax.
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(line 240)
|
||||
(line 241)
|
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* keymap: Readline Init File Syntax.
|
||||
(line 247)
|
||||
(line 248)
|
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* LANG: Creating Internationalized Scripts.
|
||||
(line 51)
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* LANG <1>: Bash Variables. (line 485)
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@@ -12032,15 +12051,15 @@ D.3 Parameter and Variable Index
|
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(line 27)
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* MAPFILE: Bash Variables. (line 540)
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* mark-modified-lines: Readline Init File Syntax.
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||||
(line 277)
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(line 278)
|
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* mark-symlinked-directories: Readline Init File Syntax.
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||||
(line 282)
|
||||
(line 283)
|
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* match-hidden-files: Readline Init File Syntax.
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(line 287)
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(line 288)
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* menu-complete-display-prefix: Readline Init File Syntax.
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(line 294)
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(line 295)
|
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* meta-flag: Readline Init File Syntax.
|
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(line 232)
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(line 233)
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* OLDPWD: Bash Variables. (line 544)
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* OPTARG: Bourne Shell Variables.
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(line 34)
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@@ -12049,9 +12068,9 @@ D.3 Parameter and Variable Index
|
||||
(line 38)
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* OSTYPE: Bash Variables. (line 551)
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* output-meta: Readline Init File Syntax.
|
||||
(line 299)
|
||||
(line 300)
|
||||
* page-completions: Readline Init File Syntax.
|
||||
(line 305)
|
||||
(line 306)
|
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* PATH: Bourne Shell Variables.
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(line 42)
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* PIPESTATUS: Bash Variables. (line 554)
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||||
@@ -12074,19 +12093,19 @@ D.3 Parameter and Variable Index
|
||||
* READLINE_POINT: Bash Variables. (line 626)
|
||||
* REPLY: Bash Variables. (line 630)
|
||||
* revert-all-at-newline: Readline Init File Syntax.
|
||||
(line 315)
|
||||
(line 316)
|
||||
* SECONDS: Bash Variables. (line 633)
|
||||
* SHELL: Bash Variables. (line 642)
|
||||
* SHELLOPTS: Bash Variables. (line 647)
|
||||
* SHLVL: Bash Variables. (line 656)
|
||||
* show-all-if-ambiguous: Readline Init File Syntax.
|
||||
(line 321)
|
||||
(line 322)
|
||||
* show-all-if-unmodified: Readline Init File Syntax.
|
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(line 327)
|
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(line 328)
|
||||
* show-mode-in-prompt: Readline Init File Syntax.
|
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(line 336)
|
||||
(line 337)
|
||||
* skip-completed-text: Readline Init File Syntax.
|
||||
(line 342)
|
||||
(line 343)
|
||||
* SRANDOM: Bash Variables. (line 661)
|
||||
* TEXTDOMAIN: Creating Internationalized Scripts.
|
||||
(line 51)
|
||||
@@ -12097,11 +12116,11 @@ D.3 Parameter and Variable Index
|
||||
* TMPDIR: Bash Variables. (line 720)
|
||||
* UID: Bash Variables. (line 724)
|
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* vi-cmd-mode-string: Readline Init File Syntax.
|
||||
(line 355)
|
||||
(line 356)
|
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* vi-ins-mode-string: Readline Init File Syntax.
|
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(line 366)
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(line 367)
|
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* visible-stats: Readline Init File Syntax.
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(line 377)
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(line 378)
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File: bash.info, Node: Function Index, Next: Concept Index, Prev: Variable Index, Up: Indexes
|
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@@ -12480,138 +12499,138 @@ D.5 Concept Index
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|
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Tag Table:
|
||||
Node: Top892
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||||
Node: Introduction2807
|
||||
Node: What is Bash?3020
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Node: What is a shell?4131
|
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Node: Definitions6666
|
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Node: Basic Shell Features9614
|
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Node: Shell Syntax10830
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Node: Shell Operation11853
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Node: Quoting13143
|
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Node: Escape Character14444
|
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Node: Single Quotes14926
|
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Node: Double Quotes15271
|
||||
Node: ANSI-C Quoting16546
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Node: Locale Translation17853
|
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Node: Creating Internationalized Scripts19161
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Node: Comments23275
|
||||
Node: Shell Commands23890
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||||
Node: Reserved Words24825
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Node: Simple Commands25578
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||||
Node: Pipelines26229
|
||||
Node: Lists29185
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||||
Node: Compound Commands30977
|
||||
Node: Looping Constructs31986
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||||
Node: Conditional Constructs34478
|
||||
Node: Command Grouping48819
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||||
Node: Coprocesses50294
|
||||
Node: GNU Parallel52954
|
||||
Node: Shell Functions53868
|
||||
Node: Shell Parameters61156
|
||||
Node: Positional Parameters65541
|
||||
Node: Special Parameters66440
|
||||
Node: Shell Expansions69651
|
||||
Node: Brace Expansion71775
|
||||
Node: Tilde Expansion74506
|
||||
Node: Shell Parameter Expansion77124
|
||||
Node: Command Substitution95458
|
||||
Node: Arithmetic Expansion96810
|
||||
Node: Process Substitution97775
|
||||
Node: Word Splitting98892
|
||||
Node: Filename Expansion100833
|
||||
Node: Pattern Matching103579
|
||||
Node: Quote Removal108184
|
||||
Node: Redirections108476
|
||||
Node: Executing Commands118133
|
||||
Node: Simple Command Expansion118800
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||||
Node: Command Search and Execution120907
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||||
Node: Command Execution Environment123282
|
||||
Node: Environment126314
|
||||
Node: Exit Status127974
|
||||
Node: Signals129755
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||||
Node: Shell Scripts133201
|
||||
Node: Shell Builtin Commands136225
|
||||
Node: Bourne Shell Builtins138260
|
||||
Node: Bash Builtins159718
|
||||
Node: Modifying Shell Behavior190571
|
||||
Node: The Set Builtin190913
|
||||
Node: The Shopt Builtin201511
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||||
Node: Special Builtins217420
|
||||
Node: Shell Variables218396
|
||||
Node: Bourne Shell Variables218830
|
||||
Node: Bash Variables220931
|
||||
Node: Bash Features253744
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||||
Node: Invoking Bash254754
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||||
Node: Bash Startup Files260764
|
||||
Node: Interactive Shells265864
|
||||
Node: What is an Interactive Shell?266271
|
||||
Node: Is this Shell Interactive?266917
|
||||
Node: Interactive Shell Behavior267729
|
||||
Node: Bash Conditional Expressions271355
|
||||
Node: Shell Arithmetic275994
|
||||
Node: Aliases278935
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||||
Node: Arrays281545
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||||
Node: The Directory Stack287789
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||||
Node: Directory Stack Builtins288570
|
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Node: Controlling the Prompt292827
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||||
Node: The Restricted Shell295789
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||||
Node: Bash POSIX Mode298396
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||||
Node: Shell Compatibility Mode310043
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Node: Job Control318069
|
||||
Node: Job Control Basics318526
|
||||
Node: Job Control Builtins323525
|
||||
Node: Job Control Variables328922
|
||||
Node: Command Line Editing330075
|
||||
Node: Introduction and Notation331743
|
||||
Node: Readline Interaction333363
|
||||
Node: Readline Bare Essentials334551
|
||||
Node: Readline Movement Commands336331
|
||||
Node: Readline Killing Commands337288
|
||||
Node: Readline Arguments339203
|
||||
Node: Searching340244
|
||||
Node: Readline Init File342427
|
||||
Node: Readline Init File Syntax343685
|
||||
Node: Conditional Init Constructs366808
|
||||
Node: Sample Init File371001
|
||||
Node: Bindable Readline Commands374122
|
||||
Node: Commands For Moving375323
|
||||
Node: Commands For History377371
|
||||
Node: Commands For Text382362
|
||||
Node: Commands For Killing386008
|
||||
Node: Numeric Arguments389038
|
||||
Node: Commands For Completion390174
|
||||
Node: Keyboard Macros394362
|
||||
Node: Miscellaneous Commands395046
|
||||
Node: Readline vi Mode400982
|
||||
Node: Programmable Completion401886
|
||||
Node: Programmable Completion Builtins409663
|
||||
Node: A Programmable Completion Example420355
|
||||
Node: Using History Interactively425599
|
||||
Node: Bash History Facilities426280
|
||||
Node: Bash History Builtins429282
|
||||
Node: History Interaction434287
|
||||
Node: Event Designators437904
|
||||
Node: Word Designators439255
|
||||
Node: Modifiers441012
|
||||
Node: Installing Bash442820
|
||||
Node: Basic Installation443954
|
||||
Node: Compilers and Options447673
|
||||
Node: Compiling For Multiple Architectures448411
|
||||
Node: Installation Names450101
|
||||
Node: Specifying the System Type452207
|
||||
Node: Sharing Defaults452920
|
||||
Node: Operation Controls453590
|
||||
Node: Optional Features454545
|
||||
Node: Reporting Bugs465760
|
||||
Node: Major Differences From The Bourne Shell467032
|
||||
Node: GNU Free Documentation License483879
|
||||
Node: Indexes509053
|
||||
Node: Builtin Index509504
|
||||
Node: Reserved Word Index516328
|
||||
Node: Variable Index518773
|
||||
Node: Function Index535544
|
||||
Node: Concept Index549325
|
||||
Node: Top888
|
||||
Node: Introduction2799
|
||||
Node: What is Bash?3012
|
||||
Node: What is a shell?4123
|
||||
Node: Definitions6658
|
||||
Node: Basic Shell Features9606
|
||||
Node: Shell Syntax10822
|
||||
Node: Shell Operation11845
|
||||
Node: Quoting13135
|
||||
Node: Escape Character14436
|
||||
Node: Single Quotes14918
|
||||
Node: Double Quotes15263
|
||||
Node: ANSI-C Quoting16538
|
||||
Node: Locale Translation17845
|
||||
Node: Creating Internationalized Scripts19153
|
||||
Node: Comments23267
|
||||
Node: Shell Commands23882
|
||||
Node: Reserved Words24817
|
||||
Node: Simple Commands25570
|
||||
Node: Pipelines26221
|
||||
Node: Lists29177
|
||||
Node: Compound Commands30969
|
||||
Node: Looping Constructs31978
|
||||
Node: Conditional Constructs34470
|
||||
Node: Command Grouping48811
|
||||
Node: Coprocesses50286
|
||||
Node: GNU Parallel52946
|
||||
Node: Shell Functions53860
|
||||
Node: Shell Parameters61742
|
||||
Node: Positional Parameters66127
|
||||
Node: Special Parameters67026
|
||||
Node: Shell Expansions70237
|
||||
Node: Brace Expansion72361
|
||||
Node: Tilde Expansion75092
|
||||
Node: Shell Parameter Expansion77710
|
||||
Node: Command Substitution96058
|
||||
Node: Arithmetic Expansion97410
|
||||
Node: Process Substitution98375
|
||||
Node: Word Splitting99492
|
||||
Node: Filename Expansion101433
|
||||
Node: Pattern Matching104179
|
||||
Node: Quote Removal108784
|
||||
Node: Redirections109076
|
||||
Node: Executing Commands118733
|
||||
Node: Simple Command Expansion119400
|
||||
Node: Command Search and Execution121507
|
||||
Node: Command Execution Environment123882
|
||||
Node: Environment126914
|
||||
Node: Exit Status128574
|
||||
Node: Signals130355
|
||||
Node: Shell Scripts133801
|
||||
Node: Shell Builtin Commands136825
|
||||
Node: Bourne Shell Builtins138860
|
||||
Node: Bash Builtins160318
|
||||
Node: Modifying Shell Behavior191171
|
||||
Node: The Set Builtin191513
|
||||
Node: The Shopt Builtin202111
|
||||
Node: Special Builtins218020
|
||||
Node: Shell Variables218996
|
||||
Node: Bourne Shell Variables219430
|
||||
Node: Bash Variables221531
|
||||
Node: Bash Features254344
|
||||
Node: Invoking Bash255354
|
||||
Node: Bash Startup Files261364
|
||||
Node: Interactive Shells266464
|
||||
Node: What is an Interactive Shell?266871
|
||||
Node: Is this Shell Interactive?267517
|
||||
Node: Interactive Shell Behavior268329
|
||||
Node: Bash Conditional Expressions271955
|
||||
Node: Shell Arithmetic276594
|
||||
Node: Aliases279535
|
||||
Node: Arrays282145
|
||||
Node: The Directory Stack288533
|
||||
Node: Directory Stack Builtins289314
|
||||
Node: Controlling the Prompt293571
|
||||
Node: The Restricted Shell296533
|
||||
Node: Bash POSIX Mode299140
|
||||
Node: Shell Compatibility Mode311061
|
||||
Node: Job Control319087
|
||||
Node: Job Control Basics319544
|
||||
Node: Job Control Builtins324543
|
||||
Node: Job Control Variables329940
|
||||
Node: Command Line Editing331093
|
||||
Node: Introduction and Notation332761
|
||||
Node: Readline Interaction334381
|
||||
Node: Readline Bare Essentials335569
|
||||
Node: Readline Movement Commands337349
|
||||
Node: Readline Killing Commands338306
|
||||
Node: Readline Arguments340221
|
||||
Node: Searching341262
|
||||
Node: Readline Init File343445
|
||||
Node: Readline Init File Syntax344703
|
||||
Node: Conditional Init Constructs367899
|
||||
Node: Sample Init File372092
|
||||
Node: Bindable Readline Commands375213
|
||||
Node: Commands For Moving376414
|
||||
Node: Commands For History378462
|
||||
Node: Commands For Text383453
|
||||
Node: Commands For Killing387099
|
||||
Node: Numeric Arguments390129
|
||||
Node: Commands For Completion391265
|
||||
Node: Keyboard Macros395453
|
||||
Node: Miscellaneous Commands396137
|
||||
Node: Readline vi Mode402073
|
||||
Node: Programmable Completion402977
|
||||
Node: Programmable Completion Builtins410754
|
||||
Node: A Programmable Completion Example421446
|
||||
Node: Using History Interactively426690
|
||||
Node: Bash History Facilities427371
|
||||
Node: Bash History Builtins430373
|
||||
Node: History Interaction435378
|
||||
Node: Event Designators438995
|
||||
Node: Word Designators440346
|
||||
Node: Modifiers442103
|
||||
Node: Installing Bash443911
|
||||
Node: Basic Installation445045
|
||||
Node: Compilers and Options448764
|
||||
Node: Compiling For Multiple Architectures449502
|
||||
Node: Installation Names451192
|
||||
Node: Specifying the System Type453298
|
||||
Node: Sharing Defaults454011
|
||||
Node: Operation Controls454681
|
||||
Node: Optional Features455636
|
||||
Node: Reporting Bugs466851
|
||||
Node: Major Differences From The Bourne Shell468123
|
||||
Node: GNU Free Documentation License484970
|
||||
Node: Indexes510144
|
||||
Node: Builtin Index510595
|
||||
Node: Reserved Word Index517419
|
||||
Node: Variable Index519864
|
||||
Node: Function Index536635
|
||||
Node: Concept Index550416
|
||||
|
||||
End Tag Table
|
||||
|
||||
|
||||
Reference in New Issue
Block a user