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Pipes & Redirects

PreviousLinux Accounts & Groups (Users & Permissions)NextShell / bash scripting

Last updated 3 years ago

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  • cat /var/log/syslog | less | - pipe. less - display contents of a file or command output, one page at a time.

    • space - go to next page

    • b - go back

    • q - quit from less interactive mode.

  • history | grep "sudo chmod" grep - Global search for Regular Expressions and Print out In the example we are looking for all commands with sudo chmod.

  • history | grep sudo > sudo-commands.txt > - redirection operator.

  • >> - appends text to the EOF (end of file). Take the output from the previous command and send to a file.

We pipe or redirect the standard output from one command to the standard input of another command.