Pipes and Redirection in Linux Explained (| > >> <)

Pipes and redirection connect commands and files together, letting the output of one command become the input of another.

Key points

• The pipe | sends the output of one command directly into the input of the next: ls | grep txt
• > redirects output to a file, overwriting it; >> appends to the file instead of overwriting
• < feeds a file's contents in as input to a command, e.g. mysql mydb < dump.sql

Example

ps aux | grep node > processes.txt