Command Line Magic

@climagic

Cool Unix/Linux Command Line tricks you can use in 140 characters or less. Here mostly to inspire all to try more. Read docs first, run later.

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climagic.org
Joined November 2009
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  1. Pinned Tweet
    3 Oct 2017

    "Step 1: Open the Terminal." :D

    19 replies 88 retweets 338 likes
  2. Retweeted
    Jan 5

    What process is listening on port 1521? $ lsof -P -i :1521 | grep LISTEN tnslsnr 11348 oracle 9u IPv4 158729213 0t0 TCP *:1521 (LISTEN)

    6 replies 35 retweets 161 likes
  3. Jan 1

    2018 resolution: make "bashism" not profanity.

    3 replies 15 retweets 70 likes
  4. 29 Dec 2017

    What new commands did you learn about in 2017? It's ok if ls or cd are some of them. Welcome.

    379 replies 176 retweets 759 likes
  5. 28 Dec 2017

    Sorry, it gets rather overloaded with so many followers. Not much I can do about that right now. Try coming back later.

    1 reply 2 retweets 17 likes
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  6. 28 Dec 2017

    I set up real lights that YOU can control from the command line and see in real time. Please be gentle. ;-)

    10 replies 49 retweets 139 likes
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  7. 28 Dec 2017

    LANG=C sort # Setting the LANG=C variable will often fix unexpected problems with sort ignoring symbol characters like +, - and * or just general weirdness. For instance, I just ran into problems because my LANG was set to en_US.UTF-8.

    9 replies 44 retweets 120 likes
  8. 22 Dec 2017

    I love this! The terminal doesn't get old, it evolves.

    1 reply 43 retweets 104 likes
  9. 21 Dec 2017

    PS1="# $PS1" # Make your prompt a bit safer with a # prefix so that if you accidentally copy & paste it, at least some lines won't execute.

    4 replies 52 retweets 135 likes
  10. 20 Dec 2017

    ps auxwf | grep -B8 "[g]zip" # Show the process in a tree format, search for gzip and show 8 lines of pre-match context to see its "family". The [] around the g in gzip is a regex trick to avoid matching the grep process itself.

    5 replies 83 retweets 255 likes
  11. 15 Dec 2017

    A sample of what the command above does.

    4 replies 58 retweets 175 likes
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  12. 15 Dec 2017

    clear ; while : ; do ack --bar | lolcat --force ; sleep 0.05 ; printf "\e[0;0H" ; done

    8 replies 78 retweets 231 likes
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  13. 15 Dec 2017

    3 replies 12 retweets 35 likes
  14. 15 Dec 2017

    rm * happens

    12 replies 89 retweets 154 likes
  15. 15 Dec 2017

    When you realize the typo you just made involves keys on opposite sides of the keyboard (break vs. bread)

    9 replies 20 retweets 81 likes
  16. 14 Dec 2017

    sort lines.txt |uniq |hexdump -c # Use hexdump to find hidden characters (space, CR, NL, ...) that prevent uniq from collapsing all entries.

    2 replies 18 retweets 81 likes
  17. 14 Dec 2017

    zcat dhcp.log.{12..1}.gz |cat - dhcp.log |awk '/DHCPREQUEST/ && !a[$10]++' # Show MAC address lines when they first showed up over past year

    2 replies 33 retweets 69 likes
  18. Retweeted
    14 Dec 2017

    chronic <mycommand> # Hides stdout and stderr unless mycommand fails.

    4 replies 30 retweets 138 likes
  19. 13 Dec 2017

    <Ctrl-e> # Move your cursor to the end of the line. Faster than holding down right arrow. You may also be able to use the End key to do the same, but that's not always convenient or setup by default

    4 replies 25 retweets 79 likes
  20. 13 Dec 2017

    <Ctrl-a> # Move your cursor to the beginning of the line. Faster than holding down left arrow. In screen, you need to press <Ctrl-a a> You may also be able to use the Home key to do the same thing, but that's not always convenient or setup by default.

    9 replies 35 retweets 106 likes
  21. 13 Dec 2017

    <Ctrl-l> # This is usually equivalent to running 'clear'. Its usually quicker and doesn't leave the command in your command line history.

    7 replies 31 retweets 96 likes

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