Shell redirection operators control where command input and output go. They are useful for saving command output, appending logs, and passing one command’s output into another command.
Write output to a file
ls -l > files.txt> writes output to a file. It replaces the existing file contents.
Append output to a file
date >> activity.log>> appends output to the end of a file.
Pipe output to another command
ps aux | grep ssh| sends the output of one command into another command for filtering or further processing.