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fix for dequoting words in pretty-print mode; posix mode changes for readonly/export invalid identifier errors

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Chet Ramey
2024-01-02 10:42:34 -05:00
parent aa2d23cfac
commit fa0b002927
20 changed files with 1531 additions and 1361 deletions
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POSIX
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@@ -223,114 +223,119 @@ The following list is what's changed when 'POSIX mode' is in effect:
42. The 'export' and 'readonly' builtin commands display their output
in the format required by POSIX.
43. The 'trap' builtin displays signal names without the leading
43. If the 'export' and 'readonly' builtin commands get an argument
that is not a valid identifier, and they are not operating on shell
functions, they return an error. This will cause a non-interactive
shell to exit because these are special builtins.
44. The 'trap' builtin displays signal names without the leading
'SIG'.
44. The 'trap' builtin doesn't check the first argument for a possible
45. The 'trap' builtin doesn't check the first argument for a possible
signal specification and revert the signal handling to the original
disposition if it is, unless that argument consists solely of
digits and is a valid signal number. If users want to reset the
handler for a given signal to the original disposition, they should
use '-' as the first argument.
45. 'trap -p' without arguments displays signals whose dispositions
46. 'trap -p' without arguments displays signals whose dispositions
are set to SIG_DFL and those that were ignored when the shell
started, not just trapped signals.
46. The '.' and 'source' builtins do not search the current directory
47. The '.' and 'source' builtins do not search the current directory
for the filename argument if it is not found by searching 'PATH'.
47. Enabling POSIX mode has the effect of setting the
48. Enabling POSIX mode has the effect of setting the
'inherit_errexit' option, so subshells spawned to execute command
substitutions inherit the value of the '-e' option from the parent
shell. When the 'inherit_errexit' option is not enabled, Bash
clears the '-e' option in such subshells.
48. Enabling POSIX mode has the effect of setting the 'shift_verbose'
49. Enabling POSIX mode has the effect of setting the 'shift_verbose'
option, so numeric arguments to 'shift' that exceed the number of
positional parameters will result in an error message.
49. When the 'alias' builtin displays alias definitions, it does not
50. When the 'alias' builtin displays alias definitions, it does not
display them with a leading 'alias ' unless the '-p' option is
supplied.
50. When the 'set' builtin is invoked without options, it does not
51. When the 'set' builtin is invoked without options, it does not
display shell function names and definitions.
51. When the 'set' builtin is invoked without options, it displays
52. When the 'set' builtin is invoked without options, it displays
variable values without quotes, unless they contain shell
metacharacters, even if the result contains nonprinting characters.
52. When the 'cd' builtin is invoked in logical mode, and the pathname
53. When the 'cd' builtin is invoked in logical mode, and the pathname
constructed from '$PWD' and the directory name supplied as an
argument does not refer to an existing directory, 'cd' will fail
instead of falling back to physical mode.
53. When the 'cd' builtin cannot change a directory because the length
54. When the 'cd' builtin cannot change a directory because the length
of the pathname constructed from '$PWD' and the directory name
supplied as an argument exceeds 'PATH_MAX' when all symbolic links
are expanded, 'cd' will fail instead of attempting to use only the
supplied directory name.
54. The 'pwd' builtin verifies that the value it prints is the same as
55. The 'pwd' builtin verifies that the value it prints is the same as
the current directory, even if it is not asked to check the file
system with the '-P' option.
55. When listing the history, the 'fc' builtin does not include an
56. When listing the history, the 'fc' builtin does not include an
indication of whether or not a history entry has been modified.
56. The default editor used by 'fc' is 'ed'.
57. The default editor used by 'fc' is 'ed'.
57. If there are too many arguments supplied to 'fc -s', 'fc' prints
58. If there are too many arguments supplied to 'fc -s', 'fc' prints
an error message and returns failure.
58. The 'type' and 'command' builtins will not report a non-executable
59. The 'type' and 'command' builtins will not report a non-executable
file as having been found, though the shell will attempt to execute
such a file if it is the only so-named file found in '$PATH'.
59. The 'vi' editing mode will invoke the 'vi' editor directly when
60. The 'vi' editing mode will invoke the 'vi' editor directly when
the 'v' command is run, instead of checking '$VISUAL' and
'$EDITOR'.
60. When the 'xpg_echo' option is enabled, Bash does not attempt to
61. When the 'xpg_echo' option is enabled, Bash does not attempt to
interpret any arguments to 'echo' as options. Each argument is
displayed, after escape characters are converted.
61. The 'ulimit' builtin uses a block size of 512 bytes for the '-c'
62. The 'ulimit' builtin uses a block size of 512 bytes for the '-c'
and '-f' options.
62. The arrival of 'SIGCHLD' when a trap is set on 'SIGCHLD' does not
63. The arrival of 'SIGCHLD' when a trap is set on 'SIGCHLD' does not
interrupt the 'wait' builtin and cause it to return immediately.
The trap command is run once for each child that exits.
63. The 'read' builtin may be interrupted by a signal for which a trap
64. The 'read' builtin may be interrupted by a signal for which a trap
has been set. If Bash receives a trapped signal while executing
'read', the trap handler executes and 'read' returns an exit status
greater than 128.
64. The 'printf' builtin uses 'double' (via 'strtod') to convert
65. The 'printf' builtin 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.
65. Bash removes an exited background process's status from the list
66. Bash removes an exited background process's status from the list
of such statuses after the 'wait' builtin is used to obtain it.
66. A double quote character ('"') is treated specially when it
67. A double quote character ('"') is treated specially when it
appears in a backquoted command substitution in the body of a
here-document that undergoes expansion. That means, for example,
that a backslash preceding a double quote character will escape it
and the backslash will be removed.
67. The 'test' builtin compares strings using the current locale when
68. The 'test' builtin compares strings using the current locale when
processing the '<' and '>' binary operators.
68. The 'test' builtin's '-t' unary primary requires an argument.
69. The 'test' builtin's '-t' unary primary requires an argument.
Historical versions of 'test' made the argument optional in certain
cases, and Bash attempts to accommodate those for backwards
compatibility.
69. Command substitutions don't set the '?' special parameter. The
70. Command substitutions don't set the '?' special parameter. The
exit status of a simple command without a command word is still the
exit status of the last command substitution that occurred while
evaluating the variable assignments and redirections in that