[FAQ] - UNIX basics for newbies

An important command to remember is "man" which provides the manual page for a given command.

Suppose you want to know more about the rm command, you would enter:

man rm

And you will see a detailed description of the command and its options.

Another useful one to keep around is "apropos" which searches for a manual relating to a keyword. This is handy if you know what it is you want to do, but can't remember what the command is to do it.
For instance, if you knew you wanted to do something to do with mail but couldn't recall the command you needed, you would enter:

apropos mail

and you'd be given a list of all the commands that feature the word "mail" in their brief description.
 
I recommend this book as well. It provides the basic Unix commands and understanding of the command line. You will find it a very good value.
 
I need to do an at, but it never work?
bash2.05$at -f file 3AM
Job a010f3ca4.000 will be executed using /bin/sh
but never execite the job why?
Thanks

 
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