Command Substitution

In tcsh, you can use the result of a command as part of a command.
- E.g. setenv OS `uname`
Anything inside backward single quotes is first evaluated in its own shell, and the result is returned as a string of one or more words.
This is very handy in scripts and in conjunction with tools like sed and awk.

In tcsh, you can use the result of a command as part of a command.