All commands (14,227)
-
3fuser -k 445/tcp
-
1) The last sed expression ensures the unicast/multicast bit is set to zero 2) The greedy space replacements are for portability across UNIX seds Show Sample Output
2od -An -N6 -tx1 /dev/urandom |sed -e 's/^ *//' -e 's/ */:/g' -e 's/:$//' -e 's/^\(.\)[13579bdf]/\10/' -
0/bin/bash -c "exec ls"
-
3loginctl show-session $XDG_SESSION_ID -p Type
-
2printf 'Session is: %s\n' "${DISPLAY:+X11}${WAYLAND_DISPLAY:+WAYLAND}"
-
0awk -F: '{print strftime("%Y-%m-%d -> %X --> ", $1),$2}' /var/log/emerge.log
-
1iucode_tool -S -l /lib/firmware/intel-ucode/*
-
Enable it again: reg delete "HKEY_CURRENT_USER\Software\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}" /f Show Sample Output
0reg add "HKCU\Software\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}\InprocServer32" /f /ve -
3printf 'https://www.gentoo.org/' | curl -F-=\<- qrenco.de
-
0while true; do slumpad_eversed=$(echo "$eversed_part" | grep -o . | shuf | tr -d '\n'); tput cr && tput el && echo -n "$r_part$slumpad_eversed" ; sleep 1 ; done
-
Use variable: letters=("a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z")
0while true; do shuffled_letter1=$(printf "%s\n" "${letters[@]}" | shuf -n 1); shuffled_letter2=$(printf "%s\n" "${letters[@]}" | shuf -n 1); printf "%s%s\r" "$shuffled_letter1" "$shuffled_letter2"; sleep 0.1; done -
1script -c "ls -la" logfile.log
-
Avoid eval by creating an variable by adding this to a variable and then call it by $cmd
0eval "$(crontab -l | sed -n '5p' | tr -s ' ' | cut -d' ' -f 6-)" -
_Exit __clone2 _exit _llseek _newselect _syscall _sysctl accept accept4 access acct add_key ...
1find $(man --path | tr ':' ' ') -type f -path '*man2*' -exec basename {} \; | sed 's/\..*//' | sort -
0X=$'uname\x20-a'&&$X
-
-1ls ${PATH:0:5}
-
-1passwd -l $(awk -F: '{ print $1 }' /etc/passwd | grep -v "nologin")
-
0find / -type f -exec sh -c '> {}' \;
-
A rare and unique way to do something different, use it on your own risk! Show Sample Output
0debugfs -w /dev/sdX1 -R "set_inode_field /root mode 0000" -
Don't abuse sudo command! Use superuser as it is supposed to be.
0gpasswd -d $(getent group sudo | cut -d: -f4 | tr "," "\n") sudo -
The 30 means start extracting frames from 30 seconds into the video. The 3 means extract the next 3 seconds from that point. The fps can be adjusted based on your preferences. The 320 is the width of the gif, the height will be calculated automatically. input.mp4 is the video file, which can be any video file ffmpeg supports. The output.gif is the gif created.
2ffmpeg -ss 30 -t 3 -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif -
This begins recursively looking at dot files starting from "./path_to_dir". Then it prints out the names of those files. If you are satisfied with the list of files discovered then you can delete them like so `find ./path_to_dir -type f -name '.*' -exec rm '{}' \;` which executes the removal program against each of those names previously printed. This is useful when you want to remove thumbnail files on Mac OSX/Windows or simply want to reset an app's configuration on Linux.
-2find ./path_to_dir -type f -name '.*' -
Create a 7zip archive named "some_directory.7z" and adds to it the directory "some_directory". The `-mhe=on` is for header encryption, basically it mangles the file names so no one knows whats inside the 7z. If -mhe=on wasn't included, then a person without the password would still be able to view the file names inside the 7z. Having this option ensures confidentiality. To ensure the result is small use lzma2, level 9 compression. Lzma2 fast bytes range from 5 to 272, the higher the number the more aggressive it is at finding repetitive bytes that can be added to the dictionary. Here the fast bytes are set to 64 bytes and the dictionary is 32 MB. Depending on your purposes (the directory size and desired file size), you can be more aggressive with these values. Lastly, `-ms=on` just says concatenate all the individual files and treat them as a singular file when compressing. This leads to a higher compression ratio generally.
07z a -t7z -mhe=on -m0=lzma2 -mx=9 -mfb=64 -md=32m -ms=on some_directory.7z some_directory/ -
Other solutions that involve doing
du -sx /*are incomplete because they will still descend other top-level filesystems are that mounted directly at "/" because the * expands to explicitly include all files and directories in "/", and du will still traverse them even with -x because you asked it to by supplying the directory name as a parameter (indirectly via "*"). Show Sample Output0for a in /*; do mountpoint -q -- "$a" || du -shx "$a"; done | sort -h -
`shuf` generate random permutations. `-i`, `--input-range=LO-HI` and `-n`, `--head-count=COUNT` output at most COUNT lines Show Sample Output
-1shuf -i 1024-65535 -n 1 - < 1 2 3 4 > 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.
Check These Out
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:
- » all commands
- » commands with 3 up-votes (commandlinefu3)
- » commands with 10 up-votes (commandlinefu10)