Commands by renich (11)

  • Extract one file from a remote tar.gz and put it where you want it

    This fetches ipfs v0.36.0 for GNU/LInux and puts it in ~/bin without a tmp file or anything else. This works if you already have ~/bin. The `--strip-components=1` flag removes the "kubo" directory in this case. If you have a tar with an even deeper directory structure, say: `some/other/directory/file`, you can just use `--strip-components=3` and it will only extract `file` for you. `-C ~/bin` puts the file in the designated path. In this case, `~/bin`. Show Sample Output


    1
    tar --strip-components=1 -C ~/bin/ -xzf <( curl -L https://dist.ipfs.tech/kubo/v0.36.0/kubo_v0.36.0_linux-amd64.tar.gz ) kubo/ipfs
    renich · 2025-08-12 03:38:07 0
  • SSH connection through host in the middle


    9
    ssh -J user@reachable_host user@unreacheable_host
    renich · 2019-08-14 17:29:45 0
  • Find all clients connected to HTTP or HTTPS ports

    It finds, specifically, the connections to the HTTP and HTTPS ports as source ports. You can check for destination ports as well. Show Sample Output


    7
    ss -o state established '( dport = :http or sport = :https )'
    renich · 2019-08-14 17:28:13 0
  • Find files modified since a specific date

    This command uses -newerXY to show you the files that are modified since a specific date. I recommend looking for "-newerXY" on the manpage to get the specifics.


    3
    find /path/to/somewhere -newermt "Jan 1"
    renich · 2014-02-02 18:02:07 0
  • clean up memory on linux (fedora)

    It clears caches from memory. It works fine on CentOS and Fedora. It will show you how much memory you need, for real.


    -4
    sync; echo 3 > /proc/sys/vm/drop_caches
    renich · 2011-04-26 21:12:06 0
  • Convert all your mp3 to ogg

    This is not recommended... lossy -> lossy = lossier. Still, you can do it! ;)


    0
    find . -iname '*.mp3' | while read song; do mpg321 ${song} -w - | oggenc -q 9 -o ${song%.mp3}.ogg -; done
    renich · 2010-03-14 11:34:35 0
  • Rename .JPG to .jpg recursively

    This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension). Show Sample Output


    8
    find /path/to/images -name '*.JPG' -exec rename "s/.JPG/.jpg/g" \{\} \;
    renich · 2010-01-02 19:12:37 4
  • View an info page on a nice interface

    Nice interface for an info page.


    1
    yelp info:foo
    renich · 2009-03-29 07:14:48 2
  • View a man page on a nice interface

    A great way of viewing some man page while using gnome.


    3
    yelp man:foo
    renich · 2009-03-29 07:13:44 3
  • Generate 10 pronunciable passwords

    A great password generation tool. http://www.adel.nursat.kz/apg/ Show Sample Output


    3
    apg -a 0 -n 10
    renich · 2009-03-28 08:52:59 4
  • iso-8859-1 to utf-8 safe recursive rename

    This command is a powerful "detoxifier" that eliminates special chars, spaces and all those little chars we don't like. It support several "sequences" so be sure to check your /usr/local/etc/detoxrc while at it... and maybe define your own Show Sample Output


    16
    detox -r -s utf_8 /path/to/old/win/files/dir
    renich · 2009-03-16 07:50:36 3

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Poor man's unsort (randomize lines)

Print CPU load in percent
Faster then all other commands here at cmdlinefu with the same purpose.

Using mplayer to play the audio only but suppress the video

keylogger
$python -c "DEV = '/dev/input/event4' #if event0 doesn't work, try event1 event2 etc fo = open(DEV) def interpret(keycode,state): if state == 0: print '%i up'%keycode if state == 1: print '%i down'%keycode if state == 2: print '%i repeat'%keycode while 1: line = fo.read(16) if ord(line[10]) != 0: keycode,state = line[10],line[12] interpret(ord(keycode),ord(state)) "

Print the last modified file

Search for packages, ranked by popularity
This will take the packages matching a given `apt-cache search` query (a collection of AND'd words or regexps) and tell you how popular they are. This is particularly nice for those times you have to figure out which solution to use for e.g. a PDF reader or a VNC client. Substitute "ubuntu.com" for "debian.org" if you want this to use Ubuntu's data instead. Everything else will work perfectly.

Block known dirty hosts from reaching your machine
Blacklisted is a compiled list of all known dirty hosts (botnets, spammers, bruteforcers, etc.) which is updated on an hourly basis. This command will get the list and create the rules for you, if you want them automatically blocked, append |sh to the end of the command line. It's a more practical solution to block all and allow in specifics however, there are many who don't or can't do this which is where this script will come in handy. For those using ipfw, a quick fix would be {print "add deny ip from "$1" to any}. Posted in the sample output are the top two entries. Be advised the blacklisted file itself filters out RFC1918 addresses (10.x.x.x, 172.16-31.x.x, 192.168.x.x) however, it is advisable you check/parse the list before you implement the rules

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Multi line grep using sed and specifying open/close tags
Working with log files that contains variable length messages wrapped between open and close tags it may be useful to filter the messages upon a keyword. This works fine with GNU sed version 4.2 or higher, so pay attention to some unix distros (solaris, hp-ux, etc.). Linux should be ok.

remove hostname from known_hosts

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