Am 20.06.2011 12:39, schrieb Adam Carter: >>> /bin/sh is a symlink to bash. >> >> Which runs as sh when run from the symlink. > > I dont understand. "runs as" usually means "runs under the user > context" to me - are you saying bash has an sh compatibility mode? >
Yes, that's exactly what he wants to say.
Interestingly, that mode still supports most bash-only features like
arrays. I guess they can do this because it doesn't change the semantic
of old Bourne shell code. It just makes some formerly invalid syntax valid.
/bin/sh -c -c 'array=( sh bash ); echo I am a ${array[1]}' 2>/dev/null
|| echo I am a sh
> I am a bash
Other drop-in replacements for /bin/sh like dash are less forgiving:
/bin/dash -c -c 'array=( sh bash ); echo I am a ${array[1]}' 2>/dev/null
|| echo I am a sh
> I am a sh
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