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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!

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Terminal - All commands - 12,420 results
sudo aa-complain /etc/apparmor.d/usr.bin.chromium-browser
2015-09-30 18:56:28
User: lordtoran
Functions: sudo

If AppArmor is installed with all profiles enforced, Chromium may refuse to start, printing a "failed to launch zygote process" error on stderr.

This command switches the Chromium profile from enforce to complain mode, effectively un-sandboxing the browser, but depending on the system setup it may be a smaller deal than a nonfunctional application.

NSPR_LOG_MODULES=nsHostResolver:5 NSPR_LOG_FILE=/tmp/log.txt /Applications/Firefox.app/Contents/MacOS/firefox
NSPR_LOG_MODULES=nsHostResolver:5 NSPR_LOG_FILE=/tmp/log.txt firefox
dnstop -l 3 enp1s0f0
./mpv_identify.sh * | egrep '^video_aspect=1\.[67]'
2015-09-29 05:47:07
User: Tatsh
Functions: egrep

Checks if the aspect ratio is approximately 1.6 (16:10) or ~1.77777778 (16:9).

Requires mpv_identify from mpv project https://github.com/mpv-player/mpv/blob/master/TOOLS/mpv_identify.sh (this replaces mplayer -identify, or midentify)

pkill imwheel && imwheel &
sudo sh -c "aptitude update; aptitude -DrVWZ full-upgrade; aptitude autoclean; exit"
2015-09-28 23:48:05
User: lordtoran
Functions: sh sudo

This has been my "sysupgrade" alias since ca. 2006, first used on Debian Sid, then Sabayon, and it still does its duty on Mint nowadays without breaking stuff.

pkill plasma-desktop && plasma-desktop
2015-09-28 23:36:24
User: lordtoran

This can help with serious GUI lockups in KDE. It will only restart Plasma + widgets, not your session, so all your programs will stay running.

sudo sh -c "rm /usr/share/mime/packages/kde.xml && update-mime-database /usr/share/mime"
wallpaper -w 800 -x 16384 -a 1.7 -b 1.85 *
2015-09-28 23:18:39
User: lordtoran

List images between 800 and 16384 pixels wide that can be displayed sized and trimmed on a widescreen display.

Requires the "wallpaper" utility.

echo "BTC rate is" $(wget https://api.bitcoinaverage.com/ticker/global/EUR/ -q -O - | jq ".last") "?"
2015-09-28 23:03:59
User: lordtoran
Functions: echo wget
Tags: wget bitcoin jq btc

Returns the global weighted BTC rate in EUR. Requires the "jq" JSON parser.

ps h -o %a 21679
2015-09-27 11:00:07
User: BeniBela
Functions: ps
Tags: Linux ps

Show the command line for a PID with ps

tr '\0' ' ' </proc/21679/cmdline ; echo
xargs -0a /proc/27288/cmdline echo
2015-09-25 17:35:11
User: dennisw
Functions: xargs
Tags: Linux /proc

If you cat the file, all the parts of the command line are bunched up. If you use tr to convert the nulls to spaces, you're still left without a newline unless you add another step. This command does everything for you.

xidel --quiet 'http://www.ebay.com/sch/Beds-Bed-Frames-/175758/i.html?_from=R40&_sac=1&_sop=15&_nkw=bed' -e 'css(".lvresult")[not(matches(., "Pickup only|BUILDING PLANS \(ONLY\)|PARTS LIST"))]/css(".lvtitle")/(.||": "||a/@href)' -f 'css("a.gspr.next")'
2015-09-24 12:11:13
User: BeniBela

The ebay URL is the search query copied from the browser (here searching for bed stuff). The regex is for crap that should not be shown. Important is "Pickup only", which filters away all the things that cannot be shipped (a filter that cannot be done on Ebay's webpage).

It will output the title and url for all matching items, for all pages of the search result.

It also works for the German Ebay.

curl -q -s http://www.hasthelhcdestroyedtheearth.com/ | sed -En '/span/s/.*>(.*)<.*/\1/p'
2015-09-23 23:26:30
User: Tatsh
Functions: sed

Use -q as first argument (as described in `man curl`) to ignore curlrc to ensure the output is always the same regardless of user's configuration.

while true; do (echo -n $(date +"%F %T"):\ ; xwininfo -id $(xprop -root|grep "ACTIVE_WINDOW("|cut -d\ -f 5) | grep "Window id" | cut -d\" -f 2 ) >> logfile; sleep 60; done
2015-09-23 23:00:14
User: BeniBela
Functions: cut date echo grep sleep

This logs the titles of the active windows, thus you can monitor what you have done during which times. (it is not hard to also log the executable name, but then it is gets too long)

xidel --quiet http://www.hasthelhcdestroyedtheearth.com/ -e //span
2015-09-23 12:31:55
User: BeniBela

This says if the LHC has destroyed the world. Run it in a loop to monitor the state of Earth. Might not work reliable, if the world has actually been destroyed.

curl -s http://www.hasthelhcdestroyedtheearth.com/ | sed -En '/span/s/.*>(.*)<.*/\1/p'
2015-09-23 12:30:31
User: BeniBela
Functions: sed

This says if the LHC has destroyed the world. Run it in a loop to monitor the state of Earth. Might not work reliable, if the world has actually been destroyed.

find . -iname '*png' -exec pngcrush -ow -brute {} {}.crush \;
2015-09-22 11:10:16
User: miniker84
Functions: find
Tags: GNU find

Find all pngs in directory structure and pngcrush them, none destructive. You can just remove the "{}.crush" part if you want destructive.

echo apt-get\ {update,-y\ upgrade}\ \&\& true | sudo bash
2015-09-22 00:48:26
User: alecthegeek
Functions: echo sudo true

it's nice to be able to use the command `ls program.{h,c,cpp}`. This expands to `ls program.h program.c program.cpp`. Note: This is a text expansion, not a shell wildcard type expansion that looks at matching file names to calculate the expansion. More details at http://www.linuxjournal.com/content/bash-brace-expansion

I often run multiple commands (like apt-get) one after the other with different subcommands. Just for fun this wraps the whole thing into a single line that uses brace expansion.

while true; do nc -z localhost 3333 >|/dev/null || (ssh -NfL 3333:REMOTE_HOST:5432 [email protected]_HOST); sleep 15; done
2015-09-21 02:25:49
User: rxw
Functions: sleep ssh

Check if SSH tunnel is open and open it, if it isn't.

NB: In this example, 3333 would be your local port, 5432 the remote port (which is, afaik, usually used by PostgreSQL) and of course you should replace REMOTE_HOST with any valid IP or hostname. The example above let's you work on remote PostgreSQL databases from your local shell, like this:

psql -E -h localhost -p 3333
F=bigdata.xz; lsof -o0 -o -Fo $F | awk -Ft -v s=$(stat -c %s $F) '/^o/{printf("%d%%\n", 100*$2/s)}'
2015-09-19 22:22:43
User: flatcap
Functions: awk stat

Imagine you've started a long-running process that involves piping data,

but you forgot to add the progress-bar option to a command.


xz -dc bigdata.xz | complicated-processing-program > summary


This command uses lsof to see how much data xz has read from the file.

lsof -o0 -o -Fo FILENAME

Display offsets (-o), in decimal (-o0), in parseable form (-Fo)

This will output something like:






Process id (p), File Descriptor (f), Offset (o)


We stat the file to get its size

stat -c %s FILENAME


Then we plug the values into awk.

Split the line at the letter t: -Ft

Define a variable for the file's size: -s=$(stat...)

Only work on the offset line: /^o/


Note this command was tested using the Linux version of lsof.

Because it uses lsof's batch option (-F) it may be portable.


Thanks to @unhammer for the brilliant idea.

f=bigdata.xz; calc "round($(lsof -o0 -o "$f"|awk '{o=substr($7,3)}END{print o}')/$(stat -c %s "$f")*100)"
2015-09-19 18:27:12
User: unhammer

Say you're started "xzcat bigdata.xz | complicated-processing-program >summary" an hour ago, and you of course forgot to enable progress output (you could've just put "awk 'NR%1000==0{print NR>"/dev/stderr"}{print}'" in the pipeline but it's too late for that now). But you really want some idea of how far along your program is. Then you can run the above command to see how many % along xzcat is in reading the file.

Note that this is for the GNU/Linux version of lsof; the one found on e.g. Darwin has slightly different output so the awk part may need some tweaks.

curl --write-out %{http_code} --connect-timeout 10 --max-time 20 -s -I -L http://google.com --output /dev/null
2015-09-19 17:29:32
User: Guyverix

Basic check to see if a website (or even an API) is responding as expected. If this is put in a case statement, there would be enough flexibility to monitor just about anything that gives an HTTP response code, as well as the network path to the site looking at curl exit codes. As this is for a possible monitor, timeouts have been added to make sure that iteration overruns do not occur. ( hopefully, curl sometimes "sticks" longer than expected )