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commit bash-20190920 snapshot

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Chet Ramey
2019-09-23 09:42:14 -04:00
parent db26b1cf58
commit d111b2af6e
24 changed files with 4954 additions and 4654 deletions
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doc/bashref.texi
+9 -7
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@@ -1033,7 +1033,8 @@ An additional binary operator, @samp{=~}, is available, with the same
precedence as @samp{==} and @samp{!=}.
When it is used, the string to the right of the operator is considered
a @sc{POSIX} extended regular expression and matched accordingly
(as in @i{regex}3)).
(using the @sc{POSIX} @code{regcomp} and @code{regexec} interfaces
usually described in @i{regex}(3)).
The return value is 0 if the string matches
the pattern, and 1 otherwise.
If the regular expression is syntactically incorrect, the conditional
@@ -1057,11 +1058,12 @@ string matching the @var{n}th parenthesized subexpression.
For example, the following will match a line
(stored in the shell variable @var{line})
if there is a sequence of characters in the value consisting of
if there is a sequence of characters anywhere in the value consisting of
any number, including zero, of
space characters, zero or one instances of @samp{a}, then a @samp{b}:
characters in the @code{space} character class,
zero or one instances of @samp{a}, then a @samp{b}:
@example
[[ $line =~ [[:space:]]*?(a)b ]]
[[ $line =~ [[:space:]]*(a)?b ]]
@end example
@noindent
@@ -1077,7 +1079,7 @@ expressions while paying attention to the shell's quote removal.
Using a shell variable to store the pattern decreases these problems.
For example, the following is equivalent to the above:
@example
pattern='[[:space:]]*?(a)b'
pattern='[[:space:]]*(a)?b'
[[ $line =~ $pattern ]]
@end example
@@ -3574,7 +3576,7 @@ with a name that is not a shell function.
@item getopts
@btindex getopts
@example
getopts @var{optstring} @var{name} [@var{args}]
getopts @var{optstring} @var{name} [@var{arg} @dots{}]
@end example
@code{getopts} is used by shell scripts to parse positional parameters.
@@ -3603,7 +3605,7 @@ and @var{name} is set to @samp{?}.
@code{getopts}
normally parses the positional parameters, but if more arguments are
given in @var{args}, @code{getopts} parses those instead.
supplied as @var{arg} values, @code{getopts} parses those instead.
@code{getopts} can report errors in two ways. If the first character of
@var{optstring} is a colon, @var{silent}