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# 8  
Old 09-16-2008
Quote:
Originally Posted by msb65
Hi,

I am currently writing BASH shell scripts. I am using BASH on a Powerbook G4 running Leopard. Could somebody please explain the difference between
#!/bin/bash and #!/bin/sh?

I have been using the latter (#!/bin/sh), and things have been working fine. But is that the correct one to use for the version of BASH that is on Leopard? Also, I plan on giving the script to somebody running Ubuntu. Which shebang would they want to use?

Mike
My understanding is that /bin/sh is the "Bourne shell" and /bin/bash is the "Bourne again shell". What this means is, "sh" is a subset of "bash", therefore anything coded under "sh" should in theory work with "bash". The reverse is not necessarily true.
# 9  
Old 09-17-2008
Quote:
Originally Posted by msb65
So I understand that bash is basically a revamped bourne shell.
Yep, the name bash is an abbreviation for Bourne again shell.
# 10  
Old 09-17-2008
And yes, /bin/bash should exist on any vanilla Ubuntu installation; but I concur with previous comments that it might be best if you could write properly sh-compatible scripts. On recent versions of Ubuntu /bin/sh is a symbolic link to /bin/dash which is a much less featureful, Bourne "classic"-compatible shell.
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