Expansion of ${!x*} and [EMAIL PROTECTED]
The manpages for "my" bash's (3.1.11 on Linux and 3.1.17 on cygwin/i686),
under Parameter Expansion, say:
${!prefix*}
[EMAIL PROTECTED]
Expands to the names of variables whose names begin with prefix,
separated by the first character of the IFS special variable.
---
From this, I'd expect both forms to have the same output.
Is this what is intended and what I should expect?
For test purposes, I set:
IFS="<" OFS=">" # (also set "Output" FS to see if it is used
# in the output of 'echo')
---
I used 4 tests, all with prefix=U, 1st pair unquoted, 2nd pair quoted.
input:
echo ' * ' = ${!U*}; \ # (line 1 - * unquoted)
echo ' @ ' = [EMAIL PROTECTED]; \ # (line 2 - @ unquoted)
echo '"*"' = "${!U*}" ; \ # (line 3 - * quoted)
echo '"@"' = "[EMAIL PROTECTED]" # (line 4 - @ quoted)
---
output:
* = UID USER # (line 1)
@ = UID USER # (line 2)
"*" = UIDhttp://lists.gnu.org/mailman/listinfo/bug-bash
Re: Expansion of ${!x*} and [EMAIL PROTECTED]
Linda Walsh wrote:
The manpages for "my" bash's (3.1.11 on Linux and 3.1.17 on cygwin/i686),
under Parameter Expansion, say:
${!prefix*}
[EMAIL PROTECTED]
Expands to the names of variables whose names begin with prefix,
separated by the first character of the IFS special variable.
[snip]
output:
* = UID USER # (line 1)
@ = UID USER # (line 2)
"*" = UID
I would assume that this works the same as other uses of * and @; if you
quote them, * expands to a single Word, while @ expands to a Word for
each logical element (so that any spaces in each element are preserved).
Similar to how if your argv is 'foo' 'bar none', "$*" gives the single
Word 'foo bar none' and "$@" gives { 'foo', 'bar none' }.
IOW this looks like the doc maybe should mention this and fails to do so.
--
Matthew
"Try to bring it back in one piece this time." -- Q (MI6)
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