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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Fork Bomb for Windows
Quick and dirty forkbomb for all flavors of windows Do not use in production. Replace start with a command of your choice, this will just open a new command prompt and is pretty tricky to stop once started

Sort file greater than a specified size in human readeable format including their path and typed by color, running from current directory
1. find file greater than 10 MB 2. direct it to xargs 3. xargs pass them as argument to ls

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

String to binary
Cool but useless.

Update zone file Serial numbers
Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc. Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this. Make sure your server's date is correct, otherwise insert your own serial number. $rndc reload should usually follow this command.

Grab just the title of a youtube video
There's another version on here that uses GET but some people don't have lwp-request, so here's an alternative. It's also a little shorter and should work with most youtube URLs since it truncates at the first &

a fast way to repeat output a byte
the speed is about 500MB/s on my machine. i think it's fast enough to output not too many bytes. while a C program may output 1GB per sencond on my machine. if the size is not the power of 512,you may change the bs and count in dd.

Play music from youtube without download

slow down CPU and IO for process and its offsprings.

convert filenames in current directory to lowercase
This will convert filenames from uppercase to lowercase. I find this useful after downloading images from my digital camera. This works for English, but other languages may need something slightly more complex like this: $ for i in *; do mv "$i" "$(echo $i|tr [:upper:] [:lower:])"; done Also, the quote marks aren't necessary if your filenames don't contain spaces.

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