shell command:

    ps -f -u ${USER} | vipe | wc -l

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** What does it do?**

Does full-format listing of processes of current user. Pipes it to "vipe" command that gives the user a chance to modify it on the fly, and then does a line count "wc -l" on it.

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description:

• ps -f -u ${USER}

  • ps A command to report a snapshot of the current processes
  • -f full-format listing output format (shows useful information in output of the command)
  • -u ${USER} show processes for current user

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• |

  • linux pipe to pass output of ps to next command

• vipe

  • vipe command allows you to run your editor in the middle of a unix pipeline and edit the data that is being piped between programs
  • See "man vipe"
  • To install vipe command on Ubuntu 20.04: sudo apt install moreutils

  • vipe opens the default editor in cli. On Ubuntu 20.04 default cli editor is nano. One way of changing it, and using vi instead, is adding export EDITOR=vi to ~/.bashrc, using following command:

        echo "export EDITOR=vi" >> ~/.bashrc
    

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• wc -l

  • wc is a word count command

  • -l causes it to show only line-count in output