Script Writing

From Cassandra

Specify what shell to use.

The first line of a shell script should specify which shell should be used during execution. The format makes the line a comment. For example:
#!/bin/sh
or
#!/bin/csh

Typical shells include the Bourne shell (/bin/sh), C shell (/bin/csh), and the korn shell (/bin/ksh).

Foxboro is the worst about not specifying the shell and then expecting csh or sh depending on how you logged in.

What's more, the only statically-linked shell on the system is /bin/sh. This is important because the other (dynamically-linked) shells require /usr to be mounted. If root's shell is not /bin/sh (and on Foxboro boxes it is not), you may not be able to log in if /usr is corrupted.