Creating Shell Commands
The shell recognizes a number of special characters on the command line. This section shows how to use these characters to do the following:
Send a program's output to a file.
Have a program read text from a file.
Append a program's output to a file.
Run a program in the background.
Using the >, >>, and < Redirection Operators
Shell redirection operators are used to direct a program's input and output. The shell can be used to feed a program input from another application, from the command line, or even from another file. These operators are used to copy, create, or overwrite files; to build reports; or to create databases.
The cat (short for concatenate) command is used to print one or more files to your display. ...
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