Introduction
The command line, is a text-based interface which allows for interaction with the computer and execution of commands. The actual command interpreter which carries out the commands is referred to as the shell and there are multiple examples of shells such as bash, zsh, sh, etc.
Input and Output Redirection
It is possible to redirect input and output from and to files when invoking commands:
| Redirection | Description |
|---|---|
< in_file | Redirect in_file into the command's standard input. |
> out_file | Redirect the command's standard output into out_file by overwriting it. |
>> out_file | Redirect the command's standard output into out_file by appending to it. |
> err_file | Redirect the command's standard error into err_file by overwriting it. |
>> err_file | Redirect the command's standard error into err_file by appending to it. |
Pipes
Moreover, information may be redirected directly from one command to another by using unnamed pipes (|).
