Reason for aliases: to make new commands.

-show aliases already set.

-dir is now the alias for the command ls with the option of -l.

-Never make DOS aliases for UNIX commands! Also, use the alias feature sparingly: it doesn't help you learn the UNIX commands and you may unintentionally overwrite an existing UNIX command!

To remove an alias:
-removes 'type' alias for cat command.

A bit more useful is creating aliases for more complicated commands:

Upon logout, aliases are lost. However, they can be defined within .cshrc (Don't set them within .login because some other shells don't support aliases.)


-to find the differences in 2 or more files.

-shows differences and gives the ed commands to make 1st file look like 2nd. (Ex: 5a 10,11 means "at line 5 append lines 10 and 11.")

-shows file with no repetative lines.

-enables file name completion.

Usage: When referencing a filename from the shell prompt, you can begin typing the filename and, at some point before finishing the entire name, press [ESC] and the filename will be completed with the rest of its name. If there are more than one file that shares a common thread (i.e.: common.chris common.andy common.jim) the file name completion feature will complete the entire common thread then allow the user to complete the unique part of the name.

For example, typing:
(assuming the afore-mentioned files are in the directory) will produce: then shell waits for further input, such as: in order to reference the file common.andy. It would be wise to remember this available feature when creating files in the first place. Just keep in mind that different UNIX systems treat this command in different ways.

-looks in the input file myfile and translates (byte by byte) the character(s) in the first argument into the character(s) in the second argument.

Translate works byte by byte

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