Hello All,

I just wanted to know what are the different ways of using commands in combination.

The most common one which i know is using pipes.
Also grouping is also done like ( ls; date) where output of both the commands is displayed.

Are there any other ways of combining various commands and using them on command line or in the scripts.

Thanks,
Rahul

.....

Thanks for that help.

Also if there are any more alternatives, please keep telling me.
If any links regrding this subject are available, please tell me.

I also wnated to know if all the commands can be used for command substitution using back quotes ``.
Are there any commands which cannot be used in substitution.

Thanks,
Rahul