There are two ways to invoke a shell script file.

Direct Interpretation

In direct interpretation, the command

csh  filename  [arg  ...]

invokes the program csh to interpret the script contained in the file ‘filename’.
 

Indirect Interpretation

In indirect interpretation, we must insert as the first line of the file

#!  /bin/csh

or

#!  /bin/csh  -f

(there are situations in which this is not necessary, but it won’t hurt to have it), and the file must be made executable using chmod (see previous discussion). Then it can be invoked in the same way as any other command, i.e., by typing the script file name on the command line.

The -f option says that we want fast startup, which it will achieve by not reading or executing the commands in .cshrc Thus for example, we won’t have the ‘set’ values for shell variables or the aliases from that file, but if we don’t need them, this will be much faster (if we need a few of them, we can simply add them to the script file itself).

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