All commands (14,233)

  • Identify GUI binaries in /usr/bin via ELF dynamic section inspection

    Detects true graphical applications (Qt, GTK, SDL, FLTK, wxWidgets) by parsing ELF dynamic tags with readelf -d instead of relying on .desktop files or executing binaries. It ignores protocol-only CLI utilities (like xset or xrandr) by targeting widget toolkits directly rather than base display server libraries (like libX11 or libwayland-client).


    1
    for b in /usr/bin/*; do [[ -f "$b" && -x "$b" ]] && readelf -d "$b" 2>/dev/null | grep -qE 'libQt[0-9]?(Gui|Widgets)|libgtk-|libgdk-|libSDL|libforms|libfltk|libwx_' && echo "GUI: $b"; done
    wuseman1 · 2026-08-19 20:11:11 0
  • ASCII Chart

    Display a compact, columnized reference of printable ASCII characters and their shell-compatible octal escape sequences. Show Sample Output


    1
    for i in {1..256};do printf '%3d %b\n' $i \\0$((i/64*100+i%64/8*10+i%8));done|cat -t|column -c$((${COLUMNS:-80}/2))
    AskApache · 2026-08-13 07:42:31 0
  • xorshift32 RNG in Bash

    The xorshift32 PRNG written by George Marsaglia in Bash, code golfed. Bash already has the $RANDOM and $SRANDOM environment variables, so this isn't all that useful. The seed "s" must be non-zero. Show Sample Output


    0
    n(){ s=$[s^s<<13];s=$[s^s>>17];s=$[s^s<<5];echo $[s&2**32-1]; }
    atoponce · 2026-07-31 03:42:35 0
  • Show top 100 DJ's on DJMAG

    https://djmag.com/top100djs Show Sample Output


    0
    elinks -dump https://djmag.com/top100djs | awk '/^[0-9]+$/ { rank=$0; next } rank && /^\[[0-9]+\]/ { gsub(/^\[[0-9]+\]/, ""); gsub(/^[ \t]+|[ \t]+$/, ""); print rank ". " $0; rank="" }'|sort -u
    wuseman1 · 2026-07-17 16:30:19 0
  • Quick regional screen recording to MP4 via slurp

    A lightweight and dependency-minimal way to record a selected region of your Wayland screen. By using `slurp`'s custom formatting directly (`%wx%h+%x+%y`), we eliminate the need for piping through helper tools like `sed` or `awk` to construct the geometry argument for `gpu-screen-recorder`. Requirements: slurp, gpu-screen-recorder


    1
    gpu-screen-recorder -w "$(slurp -f "%wx%h+%x+%y")" -f 60 -o "$HOME/rec_$(date +%Y%m%d_%H%M%S).mp4"
    wuseman1 · 2026-07-15 04:44:42 0
  • Ensure an EOF-newline for every git-tracked text file (that changed since the main branch), except for .meta files

    Ignores deleted files since main. dos2unix already skips binary files. Safely NUL-delimited. Add -i for a dry run.


    -2
    git diff --diff-filter=ACMRTUX --name-only main -z | grep -zvE '(.meta)' | xargs -0 dos2unix --add-eol
    Hype · 2026-06-23 03:50:58 0
  • Extract GitHub repository URLs from BlackArch tools pages

    Downloads BlackArch tool pages and prints only GitHub links using pure awk filtering.


    1
    curl -sL blackarch.org/{tools,recon}.html | awk -F'"' '$4 ~ /^https:\/\/github\.com\// { print $4 }'
    wuseman1 · 2026-02-12 08:38:04 0
  • Import a wireguard configuration into networkmanager


    0
    nmcli connection import type wireguard file wireguard_config.conf
    wuseman1 · 2026-02-11 20:31:36 0
  • Print a full-width horizontal line using the current terminal width (custom character supported)

    This is good when the other option on this site not includes ´tput´ like on minimal shell


    4
    printf '%*s\n' "${COLUMNS:-80}" '' | tr ' ' "${1-_}"
    wuseman1 · 2026-02-11 18:27:03 0
  • Send a file to the first reachable KDE Connect device


    2
    kdeconnect-cli -d $(kdeconnect-cli -a --id-only) --share kdeconnect-cli-send-file.sh
    wuseman1 · 2026-02-03 03:10:30 0
  • Play raw entropy noise via ALSA (bypass PulseAudio/PipeWire)


    0
    cat /dev/urandom | play -q -t raw -r 8000 -e unsigned-integer -b 8 -c 1 -t alsa default
    wuseman1 · 2026-01-27 13:25:49 0
  • Trigger a notification on USB device insertion using udev


    0
    udevadm monitor --udev --subsystem-match=usb | gawk '/add/ { system("espeak \"USB device attached\"") }'
    wuseman1 · 2026-01-27 12:24:27 0
  • Minimal Runtime Kernel Module Dependency View


    1
    lsmod | awk 'NR>1 && $4!="-" {print $1; split($4,a,","); for(i in a) print " -> used by:", a[i]; print ""}'
    wuseman1 · 2026-01-26 19:00:04 0
  • Go to the Nth line of file


    4
    awk 'NR==13' /etc/services
    atoponce · 2025-11-25 18:40:02 0
  • Quick way to sum every numbers in a file written line by line


    -1
    awk '{sum += $0} END {print sum}' file
    atoponce · 2025-11-25 18:21:44 0
  • Show tcp connections sorted by Host / Most connections


    5
    netstat -ntu | tail -n +3 | awk '{print $5}' | sed 's/:[0-9]*$//' | sort | uniq -c | sort -rn
    atoponce · 2025-11-25 18:15:39 0
  • True random number generator in pure ZSH

    Do not use this in production! This is a true hardware random number generator using your system as the entropy source. It models flipping a coin by pitting a fast clock (the CPU) against a slow clock (the RTC). The CPU models the coin flipping head over tails during flight and the RTC models the duration of the coin's flight in the air. A timer is set 1 millisecond into the future and a bit is flipped as fast as possible before the timer expires. 256 bits are collected then hashed with SHA-256 to whiten the data and ensure uniformity. This makes some assumptions however. It assumes that your system is not compromised. It assumes your system is generating enough interrupts for the kernel scheduler to be unpredictable on what gets CPU priority. It assumes that your installed sha256sum(1) command is correctly implemented. Just because you can, doesn't mean you should. Use your system's RNG (EG, /dev/urandom) instead. Show Sample Output


    1
    trng() { zmodload zsh/datetime; local flips=""; while ((${#flips}<256)); do local coin=0; local t=$((EPOCHREALTIME+0.001)); while (($EPOCHREALTIME<$t)); do ((coin^=1)); done; flips+=$coin; done; local h=($(print "$flips"|sha256sum));
    atoponce · 2025-11-24 18:13:40 0
  • log2 in Bash

    Calculates the ceiling of the log2 of a given argument. Show Sample Output


    1
    log2() { local n=0; for ((i=$1-1; i>0; i>>=1)); do ((n+=1)); done; echo $n; }
    atoponce · 2025-11-24 17:17:14 0
  • Enhanced Buffer in order to avoir mistakes with redirections that empty your files

    Issues & improvements Race conditions: the check for writability then mv is not fully atomic — another process could create/remove/change the target between the test and mv. Permissions and ownership: mv will preserve contents but the resulting file may have the temp file's permissions/ownership (mktemp default). Signal safety: if interrupted (SIGINT, SIGTERM) the temp file may remain. Portability: uses bash-compatible constructs but relies on mktemp and -a (POSIX [ -a ] is obsolete; better to use -e). Better error messages and exit status handling. Allow optional mode to write to stdout when no filename given. Support setting desired file mode (umask or chmod) and preserve atomic replace semantics. Enhanced version Uses safer existence test ([ -e ] not deprecated -a). Installs traps to clean up temp file on exit/signals. Preserves mode of the existing file (if it exists) or allows a chmod option. Attempts a safer atomic replace: write to temp in same directory as target when a filename is supplied (reduces window for cross-filesystem mv failure and preserves atomicity). If no filename given, writes temp contents to stdout. Returns non-zero on failure and prints concise errors to stderr.


    -5
    buffer(){ tty -s&&return; d=${1:-/tmp}; tmp=$(mktemp "$d/.b.XXXXXX")||return; trap 'rm -f "$tmp"' EXIT; cat>"$tmp"||{ rm -f "$tmp"; return 1; }; [ -z "$1" ]&&{ cat "$tmp"; rm -f "$tmp"; return 0; }; mv -f "$tmp" "$1"; }
    cryptology_codes · 2025-09-14 21:19:55 0
  • Android VOLUME_DOWN


    0
    adb shell input keyevent KEYCODE_VOLUME_DOWN
    alikhalil · 2025-08-13 13:22:00 0
  • 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
  • List memory percentage per user

    Show top 10 users by memory combined consumption in percentage. Show Sample Output


    -1
    ps aux | awk '{arr[$1]+=$4}; END {for (i in arr) {print i,arr[i]}}' | sort -hk2 | tail -10
    Raboo · 2025-08-01 07:06:55 0
  • Display history of reboots

    If you need to see a list of the reboots of your system with date and time stamps then on a Linux with systemd you can use (as non-root) the command: journalctl --list-boots This could be useful if you are trying to track when a power outage occurred. An alternative is: /bin/sudo grep "^-" /var/log/boot.log ^ This only shows the boot start date/times while the journalctl command shows a "LAST ENTRY" associated with each "BOOT ID". Show Sample Output


    1
    $ journalctl --list-boots # display tabular history of reboots
    mpb · 2025-07-22 14:52:34 0
  • Tapping screen for TikTok using shell script


    1
    while true; do input tap $(wm size | awk -F 'x' '{print $1/2 " " $2/2}'); done
    wuseman1 · 2025-05-27 13:32:54 0
  • Mount SMB v1 share on Linux


    0
    mount -t cifs -o username=administrator,password=xxx,vers=1.0,sec=ntlmv2 //192.168.0.30/nas_share /mnt/win_share
    swarzynski · 2025-03-20 08:16:19 0
  •  1 2 3 >  Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Get curenttly playing track in Last.fm radio

Compare a remote dir with a local dir
You can compare directories on two different remote hosts as well: $ diff -y

Speed up launch of firefox
Compress information DBs of firefox to speed up the launch of browser.

This command provides more color variety for the rainbow-like appearance by generating random color codes from 16 to 231 for adb logcat.

Grab mp3 files from your favorite netcasts, mp3blog, or sites that often have good mp3s
This was gotten from http://www.veen.com/jeff/archives/000573.html. The line will grab all the mp3 files on the urls listed in text file sourceurls.txt (one url per line) . A much more complete breakdown of the line can be found at the web site mentioned above.

Update a namecheap @ A record to point to your current internet-facing IP address
Sets the @ A record for your domain hosted by namecheap to your current internet-facing IP address, logs success or failure with syslog, and logs the data returned to /root/dnsupdate. Change the XXX's as appropriate. More info at: http://www.namecheap.com/support/knowledgebase/article.aspx/29/

edit, view or execute last modified file with a single key-press
Copy this function to command line, press 'Enter' 'f'' 'Enter' to execute (sentence on the left written only for newbies). Hint 'e|x|v|1..9' in front of displayed last modified file name means: "Press 'e' for edit,'x' for execute,'v' for view or a digit-key '1..9' to touch one file from the recent files list to be last modified" and suggested (hidden files are listed too, else remove 'a' from 'ls -tarp' statement if not intended). If you find this function useful you can then rename it if needed and append or include into your ~/.bashrc config script. With the command $ . ~/.bashrc the function then can be made immediately available. In the body of the function modifications can be made, i.e. replaced joe editor command or added new option into case statement, for example 'o) exo-open $h;;' command for opening file with default application - or something else (here could not be added since the function would exceed 255 chars). To cancel execution of function started is no need to press Ctrl-C - if the mind changed and want to leave simple Enter-press is enough. Once defined, this function can with $ typeset -f f command be displayed in easy readable form

Rename files in batch

Shows space used by each directory of the root filesystem excluding mountpoints/external filesystems (and sort the output)

Duplicate installed packages from one machine to the other (RPM-based systems)

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: