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From: | Matthew Woehlke |
Subject: | Re: Expansion of ${!x*} and ${!x@} |
Date: | Tue, 07 Nov 2006 16:43:56 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.7) Gecko/20060909 Thunderbird/1.5.0.7 Mnenhy/0.7.4.0 |
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*} ${!prefix@} Expands to the names of variables whose names begin with prefix, separated by the first character of the IFS special variable. [snip] output: * = UID USER # (line 1) @ = UID USER # (line 2) "*" = UID<USER # (line 3) "@" = UID USER # (line 4) --- QUESTIONS continued... - If the two forms are supposed to be identical, why aren't lines 3 & 4 the same? - Why do the quotes in line 3 make for different output than in line Why aren't the 4 lines identical?
I would assume that this works the same as other uses of * and @; if you quote them, * expands to a single Word, while @ expands to a Word for each logical element (so that any spaces in each element are preserved). Similar to how if your argv is 'foo' 'bar none', "$*" 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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