On Thu, Aug 29, 2013 at 04:49:12PM -0700, Jack Bates wrote:
> What is DASH supposed to do when input is redirected from a file,
> and the file name is a glob pattern? e.g.
> tar xz < foo-*.tar.gz
> Is it supposed to expand the glob pattern, or is that not supported?
Per POSIX XCU 2.7 Redirection, pathname generation may (but need not) be
performed on the word after a redirection operator other than << or <<-
if the shell is interactive and one word would result.
Dash chooses the option that results in the smallest code: never
performing pathname generation in this case.
> The following both work, is there a better workaround?
> tar fxz foo-*.tar.gz
> tar xz < $(echo foo-*.tar.gz)
These are both concise methods. The former's problem is that it does
something strange if more than one file matches. The second has problems
with pathnames starting with '-', containing backslashes or ending with
newlines.
In a script you might do
set -- foo-*.tar.gz
if [ "$#" -ne 1 ] || [ ! -f "$1" ]; then
echo "Bad wildcard"
exit 2
fi
tar -xzf "$1"
--
Jilles Tjoelker
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