Pipes and Redirects

terminal Linux Architecture and Components MOC

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Pipes

Pipes combine programs for more functionality.

Scroll through all processes

$ ps auxf | less

Search for process

$ ps aux | grep bash | grep -v grep | less

Redirects

Redirects output a command to a file instead of another command like a pipe.

Using > overwrites the file while >> appends the information to the file.

$ ls
$ echo "hello one!" > afile; ls
afile
$ cat afile
hello one!
$ echo "hello two!" > afile; cat afile
hello two!
$ echo "hello three!" >> afile; cat afile
hello two!
hello three!

Chaining

Chaining commands runs the programs consecutively and individually.