portability and compatibility fixes

doc/bash.info

@@ -1,9 +1,9 @@
 This is bash.info, produced by makeinfo version 6.8 from bashref.texi.
 
 This text is a brief description of the features that are present in the
-Bash shell (version 5.2, 22 November 2021).
+Bash shell (version 5.2, 2 December 2021).
 
-   This is Edition 5.2, last updated 22 November 2021, of 'The GNU Bash
+   This is Edition 5.2, last updated 2 December 2021, of 'The GNU Bash
 Reference Manual', for 'Bash', Version 5.2.
 
    Copyright (C) 1988-2021 Free Software Foundation, Inc.
@@ -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, 22 November 2021).  The Bash home page is
+Bash shell (version 5.2, 2 December 2021).  The Bash home page is
 <http://www.gnu.org/software/bash/>.
 
-   This is Edition 5.2, last updated 22 November 2021, of 'The GNU Bash
+   This is Edition 5.2, last updated 2 December 2021, of 'The GNU Bash
 Reference Manual', for 'Bash', Version 5.2.
 
    Bash contains features that appear in other popular shells, and some
@@ -7349,10 +7349,28 @@ required for bash-5.1 and later versions.
           suppresses that message when the '-l' option is supplied.
 
 'compat51 (set using BASH_COMPAT)'
-        * The 'unset' builtin treats attempts to unset array subscripts
-          '@' and '*' differently depending on whether the array is
-          indexed or associative, and differently than in previous
-          versions.
+        * The 'unset' builtin will unset the array 'a' given an argument
+          like 'a[@]'.  Bash-5.2 will unset an element with key '@'
+          (associative arrays) or remove all the elements without
+          unsetting the array (indexed arrays)
+        * arithmetic commands ( ((...))  )  and the expressions in an
+          arithmetic for statement can be expanded more than once
+        * expressions used as arguments to arithmetic operators in the
+          '[[' conditional command can be expanded more than once
+        * the expressions in substring parameter brace expansion can be
+          expanded more than once
+        * the expressions in the $(( ...  ))  word expansion can be
+          expanded more than once
+        * arithmetic expressions used as indexed array subscripts can be
+          expanded more than once
+        * 'test -v', when given an argument of 'A[@]', where A is an
+          existing associative array, will return true if the array has
+          any set elements.  Bash-5.2 will look for and report on a key
+          named '@'
+        * the ${PARAMETER[:]=VALUE} word expansion will return VALUE,
+          before any variable-specific transformations have been
+          performed (e.g., converting to lowercase).  Bash-5.2 will
+          return the final value assigned to the variable.
 
 
 File: bash.info,  Node: Job Control,  Next: Command Line Editing,  Prev: Bash Features,  Up: Top
@@ -10719,6 +10737,10 @@ does not provide the necessary support.
 '--enable-strict-posix-default'
      Make Bash POSIX-conformant by default (*note Bash POSIX Mode::).
 
+'--enable-translatable-strings'
+     Enable support for '$"STRING"' translatable strings (*note Locale
+     Translation::).
+
 '--enable-usg-echo-default'
      A synonym for '--enable-xpg-echo-default'.
 
@@ -12392,138 +12414,138 @@ D.5 Concept Index
 
 
 Tag Table:
-Node: Top894
-Node: Introduction2811
-Node: What is Bash?3024
-Node: What is a shell?4135
-Node: Definitions6670
-Node: Basic Shell Features9618
-Node: Shell Syntax10834
-Node: Shell Operation11857
-Node: Quoting13147
-Node: Escape Character14448
-Node: Single Quotes14930
-Node: Double Quotes15275
-Node: ANSI-C Quoting16550
-Node: Locale Translation17857
-Node: Creating Internationalized Scripts19165
-Node: Comments23279
-Node: Shell Commands23894
-Node: Reserved Words24829
-Node: Simple Commands25582
-Node: Pipelines26233
-Node: Lists29189
-Node: Compound Commands30981
-Node: Looping Constructs31990
-Node: Conditional Constructs34482
-Node: Command Grouping48823
-Node: Coprocesses50298
-Node: GNU Parallel52958
-Node: Shell Functions53872
-Node: Shell Parameters61160
-Node: Positional Parameters65545
-Node: Special Parameters66444
-Node: Shell Expansions69655
-Node: Brace Expansion71779
-Node: Tilde Expansion74510
-Node: Shell Parameter Expansion77128
-Node: Command Substitution94991
-Node: Arithmetic Expansion96343
-Node: Process Substitution97308
-Node: Word Splitting98425
-Node: Filename Expansion100366
-Node: Pattern Matching102963
-Node: Quote Removal107568
-Node: Redirections107860
-Node: Executing Commands117517
-Node: Simple Command Expansion118184
-Node: Command Search and Execution120291
-Node: Command Execution Environment122666
-Node: Environment125698
-Node: Exit Status127358
-Node: Signals129139
-Node: Shell Scripts132585
-Node: Shell Builtin Commands135609
-Node: Bourne Shell Builtins137644
-Node: Bash Builtins159102
-Node: Modifying Shell Behavior189955
-Node: The Set Builtin190297
-Node: The Shopt Builtin200836
-Node: Special Builtins216547
-Node: Shell Variables217523
-Node: Bourne Shell Variables217957
-Node: Bash Variables220058
-Node: Bash Features252870
-Node: Invoking Bash253880
-Node: Bash Startup Files259890
-Node: Interactive Shells264990
-Node: What is an Interactive Shell?265397
-Node: Is this Shell Interactive?266043
-Node: Interactive Shell Behavior266855
-Node: Bash Conditional Expressions270481
-Node: Shell Arithmetic275120
-Node: Aliases278061
-Node: Arrays280671
-Node: The Directory Stack286915
-Node: Directory Stack Builtins287696
-Node: Controlling the Prompt291953
-Node: The Restricted Shell294915
-Node: Bash POSIX Mode297522
-Node: Shell Compatibility Mode308792
-Node: Job Control315708
-Node: Job Control Basics316165
-Node: Job Control Builtins321164
-Node: Job Control Variables326561
-Node: Command Line Editing327714
-Node: Introduction and Notation329382
-Node: Readline Interaction331002
-Node: Readline Bare Essentials332190
-Node: Readline Movement Commands333970
-Node: Readline Killing Commands334927
-Node: Readline Arguments336842
-Node: Searching337883
-Node: Readline Init File340066
-Node: Readline Init File Syntax341324
-Node: Conditional Init Constructs362809
-Node: Sample Init File367002
-Node: Bindable Readline Commands370123
-Node: Commands For Moving371324
-Node: Commands For History373372
-Node: Commands For Text378363
-Node: Commands For Killing382009
-Node: Numeric Arguments385039
-Node: Commands For Completion386175
-Node: Keyboard Macros390363
-Node: Miscellaneous Commands391047
-Node: Readline vi Mode396983
-Node: Programmable Completion397887
-Node: Programmable Completion Builtins405664
-Node: A Programmable Completion Example416356
-Node: Using History Interactively421600
-Node: Bash History Facilities422281
-Node: Bash History Builtins425283
-Node: History Interaction430288
-Node: Event Designators433905
-Node: Word Designators435256
-Node: Modifiers437013
-Node: Installing Bash438821
-Node: Basic Installation439955
-Node: Compilers and Options443674
-Node: Compiling For Multiple Architectures444412
-Node: Installation Names446102
-Node: Specifying the System Type448208
-Node: Sharing Defaults448921
-Node: Operation Controls449591
-Node: Optional Features450546
-Node: Reporting Bugs461636
-Node: Major Differences From The Bourne Shell462908
-Node: GNU Free Documentation License479755
-Node: Indexes504929
-Node: Builtin Index505380
-Node: Reserved Word Index512204
-Node: Variable Index514649
-Node: Function Index531138
-Node: Concept Index544919
+Node: Top892
+Node: Introduction2807
+Node: What is Bash?3020
+Node: What is a shell?4131
+Node: Definitions6666
+Node: Basic Shell Features9614
+Node: Shell Syntax10830
+Node: Shell Operation11853
+Node: Quoting13143
+Node: Escape Character14444
+Node: Single Quotes14926
+Node: Double Quotes15271
+Node: ANSI-C Quoting16546
+Node: Locale Translation17853
+Node: Creating Internationalized Scripts19161
+Node: Comments23275
+Node: Shell Commands23890
+Node: Reserved Words24825
+Node: Simple Commands25578
+Node: Pipelines26229
+Node: Lists29185
+Node: Compound Commands30977
+Node: Looping Constructs31986
+Node: Conditional Constructs34478
+Node: Command Grouping48819
+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 Substitution94987
+Node: Arithmetic Expansion96339
+Node: Process Substitution97304
+Node: Word Splitting98421
+Node: Filename Expansion100362
+Node: Pattern Matching102959
+Node: Quote Removal107564
+Node: Redirections107856
+Node: Executing Commands117513
+Node: Simple Command Expansion118180
+Node: Command Search and Execution120287
+Node: Command Execution Environment122662
+Node: Environment125694
+Node: Exit Status127354
+Node: Signals129135
+Node: Shell Scripts132581
+Node: Shell Builtin Commands135605
+Node: Bourne Shell Builtins137640
+Node: Bash Builtins159098
+Node: Modifying Shell Behavior189951
+Node: The Set Builtin190293
+Node: The Shopt Builtin200832
+Node: Special Builtins216543
+Node: Shell Variables217519
+Node: Bourne Shell Variables217953
+Node: Bash Variables220054
+Node: Bash Features252866
+Node: Invoking Bash253876
+Node: Bash Startup Files259886
+Node: Interactive Shells264986
+Node: What is an Interactive Shell?265393
+Node: Is this Shell Interactive?266039
+Node: Interactive Shell Behavior266851
+Node: Bash Conditional Expressions270477
+Node: Shell Arithmetic275116
+Node: Aliases278057
+Node: Arrays280667
+Node: The Directory Stack286911
+Node: Directory Stack Builtins287692
+Node: Controlling the Prompt291949
+Node: The Restricted Shell294911
+Node: Bash POSIX Mode297518
+Node: Shell Compatibility Mode308788
+Node: Job Control316814
+Node: Job Control Basics317271
+Node: Job Control Builtins322270
+Node: Job Control Variables327667
+Node: Command Line Editing328820
+Node: Introduction and Notation330488
+Node: Readline Interaction332108
+Node: Readline Bare Essentials333296
+Node: Readline Movement Commands335076
+Node: Readline Killing Commands336033
+Node: Readline Arguments337948
+Node: Searching338989
+Node: Readline Init File341172
+Node: Readline Init File Syntax342430
+Node: Conditional Init Constructs363915
+Node: Sample Init File368108
+Node: Bindable Readline Commands371229
+Node: Commands For Moving372430
+Node: Commands For History374478
+Node: Commands For Text379469
+Node: Commands For Killing383115
+Node: Numeric Arguments386145
+Node: Commands For Completion387281
+Node: Keyboard Macros391469
+Node: Miscellaneous Commands392153
+Node: Readline vi Mode398089
+Node: Programmable Completion398993
+Node: Programmable Completion Builtins406770
+Node: A Programmable Completion Example417462
+Node: Using History Interactively422706
+Node: Bash History Facilities423387
+Node: Bash History Builtins426389
+Node: History Interaction431394
+Node: Event Designators435011
+Node: Word Designators436362
+Node: Modifiers438119
+Node: Installing Bash439927
+Node: Basic Installation441061
+Node: Compilers and Options444780
+Node: Compiling For Multiple Architectures445518
+Node: Installation Names447208
+Node: Specifying the System Type449314
+Node: Sharing Defaults450027
+Node: Operation Controls450697
+Node: Optional Features451652
+Node: Reporting Bugs462867
+Node: Major Differences From The Bourne Shell464139
+Node: GNU Free Documentation License480986
+Node: Indexes506160
+Node: Builtin Index506611
+Node: Reserved Word Index513435
+Node: Variable Index515880
+Node: Function Index532369
+Node: Concept Index546150
 
 End Tag Table