Filename brace expansion in scripts
matthew.flaschen at gatech.edu
Thu Nov 18 18:46:40 UTC 2010
Colin Law wrote:
> I see, I don't now know where I got into the habit of putting
> usr/bin/env sh there.
That (or #! /bin/sh) is appropriate when you want a standard (POSIX)
shell script. If you want a bash script, use #! /bin/bash . Generally,
you should not leave off the shebang entirely.
Somehow I had understood that as the
> conventional thing to do. ls -al /bin/sh shows that this is a link to
> dash. Why does dash not do brace expansion I wonder.
Ubuntu changed /bin/sh to dash because it's significantly faster than
bash. However, part of the cost is that it doesn't support non-standard
features like brace expansion. See https://wiki.ubuntu.com/DashAsBinSh
for more information.
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