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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags



Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands tagged bash from sorted by
Terminal - Commands tagged bash - 733 results
for i in */; do echo $(find $i -type f -regextype posix-extended -regex ".*\.(mp3|ogg|wav|flac)" | wc -l) $i ; done
find . -type d -maxdepth 1 -print0 | xargs -0 -I{} sh -c 'find "{}" -type f | grep "ogg\|mp3\|wav\|flac$" | wc -l | tr -d "\n"; echo " {}"'
2013-12-22 13:40:29
User: dbrgn
Functions: echo find grep sh tr wc xargs

This lists the number of ogg/mp3/wav/flac files in each subdirectory of the current directory. The output can be sorted by piping it into "sort -n".

bind -P | grep -v "is not" | sed -e 's/can be found on/:/' | column -s: -t
2013-12-19 12:30:19
User: leni536
Functions: column grep sed

Shows all available keyboard bindings in bash. Pretty printing.

ls -d .??*
2013-12-17 19:06:30
User: pydave
Functions: ls
Tags: bash glob

You can omit the -d to see what's inside directories. In that case, you may want -a to see dotfiles inside those directories. (Otherwise you don't need -a since you're explicitly looking at them.)

rpm -qa --queryformat '%{SIZE}\n' | awk '{sum += $1} END {printf("Total size in packages = %4.1f GB\n", sum/1024**3)}'
2013-12-14 20:22:41
User: skytux
Functions: awk rpm

It is not the installed size in files, but the size of RPM packages.

grep -c "search_string" /path/to/file
2013-12-10 18:13:54
User: meatflag
Functions: grep

-c will count the number of times your search matches in the file.

alias ltmux="if tmux has-session -t $USER; then tmux attach -t $USER; else tmux new -s $USER; fi"
2013-12-10 14:46:28
Functions: alias
Tags: bash alias sh tmux

If a session with named the same as your username already exists, then attach to it, otherwise create it

for i in */; do echo run_command "${i}"; done
2013-11-25 18:33:26
User: mirams
Functions: echo

Change the "run_command" to whatever command you want, and remove the "echo" to run it once you are happy.

nc -kl 5432 -c 'echo -e "HTTP/1.1 200 OK\r\n$(date)\r\n\r\n";echo "<p>How are you today?</p>"'
2013-11-12 14:00:11
User: gvitalie
Functions: echo

-k, --keep-open will keep connection alive, and we could exclude using 'while true'

nc is such a powerful command, it could be used instead of any OS! :p

curl ipinfo.io/<ipaddress>
xmodmap -e "pointer = $(shuf -i 1-5 | tr '\n' ' ')"
2013-10-23 16:02:04
User: lynks

Randomly remaps the first 5 mouse buttons (left, middle, right, upscroll, downscroll) in X for some reasonably harmless trolling. Non-persistant unless added to ~/.xinitrc or similar. The 'shuf' command is present on most modern desktop distros.

To reverse use xmodmap -e "pointer = 1 2 3 4 5"

alias tasks='git grep -EI "TODO|FIXME"'
2013-10-21 23:54:46
User: lizardo
Functions: alias grep
Tags: bash git todo

"git grep" automatically excludes untracked files (e.g. compiler output) and files under .git directory. If no directory or file is given, it will recursively search through the current directory.

alias tasks='grep --exclude-dir=.git -rEI "TODO|FIXME" . 2>/dev/null'
2013-10-17 16:40:10
User: joepie91
Functions: alias
Tags: bash todo

Place this in your .bashrc (or run it once) to set the `tasks` alias. Next time you enter `tasks` into a terminal, it will give you a list of all TODO and FIXME comments in the current directory and child directories, giving you a quick overview of what you still have to do!

ps -p $$
_autoOptions() { local cur=${COMP_WORDS[COMP_CWORD]} COMPREPLY=( $(compgen -W "--fooOption --barOption -f -b" -- $cur) ) ;}; complete -F _autoOptions autoOptions
tstouch() { [[ $1 =~ $2 ]] && touch -t ${BASH_REMATCH[1]} $1; }
2013-10-01 20:00:34
User: bartonski
Functions: touch
Tags: bash touch

tstouch takes two arguments: a filename containing a timestamp, and an extended regular expression with the parenthesized section matching a timestamp of the form YYYYMMDDhhmm or YYYYMMDDhhmm.ss.

It then touches the file with that timestamp.

dpkg-query -Wf '${Installed-Size}\t${Status}\t${Package}\n' | sort -n | grep installed
(IFS=,; echo "${array[*]}")
2013-09-25 10:36:38
User: aspiers
Functions: echo

This type of join is clearly documented in the bash manual. Only the first character of IFS is used for the delimiter.

wget -q -O- http://example-podcast-feed.com/rss | grep -o "<enclosure[ -~][^>]*" | grep -o "http://[ -~][^\"]*" | xargs wget -c
2013-09-24 12:38:08
User: talha131
Functions: grep wget xargs

This script can be used to download enclosed files from a RSS feed. For example, it can be used to download mp3 files from a podcasts RSS feed.

for ff in directory; do numLines=`wc -l $ff`; numLines=$(echo $numLines | sed 's/ .*//g'); min=$(sort -nrk 1 $ff | tail -1); if [ $numLines -gt 100 ]; then echo $min >> minValues; fi;done;
for f in ./*.xls; do mv "$f" "${f%.*}.ods"; done
2013-09-17 01:41:56
User: evilsoup
Functions: mv
Tags: bash Linux

An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.

2013-09-15 03:41:13
User: hackerb9

Bash's history expansion character, "!", has many features, including "!:" for choosing a specific argument (or range of arguments) from the history. The gist is any number after !: is the number of the argument you want, with !:1 being the first argument and !:0 being the command. See the sample output for a few examples. For full details search for "^HISTORY EXPANSION" in the bash(1) man page.

 Note that this version improves on the previous function in that it handles arguments that include whitespace correctly.

ln -s /BASE/* /TARGET/
2013-09-12 18:47:35
User: thehitman
Functions: ln
Tags: bash

Simple and easy to remember, if it already exists then it just ignores it.

rename 's/.xls/.ods/g' *.xls
<Meta-p> (aka <ALT+P>)
2013-09-10 17:13:02
User: hackerb9
Tags: history bash tcsh

[Click the "show sample output" link to see how to use this keystroke.]

Meta-p is one of my all time most used and most loved features of working at the command line. It's also one that surprisingly few people know about. To use it with bash (actually in any readline application), you'll need to add a couple lines to your .inputrc then have bash reread the .inputrc using the bind command:

echo '"\en": history-search-forward' >> ~/.inputrc

echo '"\ep": history-search-backward' >> ~/.inputrc

bind -f ~/.inputrc

  I first learned about this feature in tcsh. When I switched over to bash about fifteen years ago, I had assumed I'd prefer ^R to search in reverse. Intuitively ^R seemed better since you could search for an argument instead of a command. I think that, like using a microkernel for the Hurd, it sounded so obviously right fifteen years ago, but that was only because the older way had benefits we hadn't known about.

  I think many of you who use the command line as much as I do know that we can just be thinking about what results we want and our fingers will start typing the commands needed. I assume it's some sort of parallel processing going on with the linguistic part of the brain. Unfortunately, that parallelism doesn't seem to work (at least for me) with searching the history. I realize I can save myself typing using the history shortly after my fingers have already started "speaking". But, when I hit ^R in Bash, everything I've already typed gets ignored and I have to stop and think again about what I was doing. It's a small bump in the road but it can be annoying, especially for long-time command line users. Usually M-p is exactly what I need to save myself time and trouble.

  If you use the command line a lot, please give Meta-p a try. You may be surprised how it frees your brain to process more smoothly in parallel. (Or maybe it won't. Post here and let me know either way. ☺)