What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.

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:



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





Commands using sort from sorted by
Terminal - Commands using sort - 660 results
du -h --max-depth=1 /home/ | sort -n
du -sh * | sort -h
du -x --max-depth=1|sort -rn|awk -F / -v c=$COLUMNS 'NR==1{t=$1} NR>1{r=int($1/t*c+.5); b="\033[1;31m"; for (i=0; i<r; i++) b=b"#"; printf " %5.2f%% %s\033[0m %s\n", $1/t*100, b, $2}'|tac
2015-09-12 10:36:49
Functions: awk du printf sort

A more efficient way, with reversed order to put the focus in the big ones.

stat -c'%s %n' **/* | sort -n
find /proc/*/fd -xtype f -printf "%l\n" | grep -P '^/(?!dev|proc|sys)' | sort | uniq -c | sort -n
2015-08-18 17:58:21
User: flatcap
Functions: find grep sort uniq
Tags: sort uniq find grep

List all open files of all processes.


find /proc/*/fd

Look through the /proc file descriptors


-xtype f

list only symlinks to file


-printf "%l\n"

print the symlink target


grep -P '^/(?!dev|proc|sys)'

ignore files from /dev /proc or /sys


sort | uniq -c | sort -n

count the results


Many processes will create and immediately delete temporary files.

These can the filtered out by adding:

... | grep -v " (deleted)$" | ...
lsof -a -d 1-99 -Fn / | grep ^n | cut -b2- | sort | uniq -c | sort -n
sudo lsof | egrep 'w.+REG' | awk '{print $10}' | sort | uniq -c | sort -n
2015-08-18 14:09:02
User: kennethjor
Functions: awk egrep sort sudo uniq

This command run fine on my Ubuntu machine, but on Red Hat I had to change the awk command to `awk '{print $10}'`.

phpcs --no-colors --standard=WordPress-Core -s -- $( find . -name '*.php' ) | ack -o '(?<=\()\w+(\.\w+)+(?=\)$)' | sort | uniq -c | sort -nr
sort -s -b -t' ' -k 4.9,4.12n -k 4.5,4.7M -k 4.2,4.3n -k 4.14,4.15n -k 4.17,4.18n -k 4.20,4.21n access.log*
2015-07-16 00:22:03
User: sesom42
Functions: sort
Tags: sort log apache

Sort Apache access logs by date and time using sort key field feature

ps -auxf | sort -nr -k 4 | head -10
mosth() { history | awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl | head -n10; }
2015-05-11 17:41:55
User: nnsense
Functions: awk column grep head nl sort

I copied this (let's be honest) somewhere on internet and I just made it as a function ready to be used as alias. It shows the 10 most used commands from history. This seems to be just another "most used commands from history", but hey.. this is a function!!! :D

du -hs .[^.]* * | sort -h
2015-05-10 12:19:29
User: liminal
Functions: du sort
Tags: du usage disk

Same result as with 'du -ks .[^.]* * | sort -n' but with size outputs in human readable format (e.g., 1K 234M 2G)

locate -i /pattern/ | xargs -n1 dirname | sort -u
2015-05-09 21:22:05
User: dardo1982
Functions: dirname locate sort xargs
Tags: find case

Uses "locate" instead of "find", "sort -u" instead of "sort | uniq" and it's case insensitive.

du -ks .[^.]* * | sort -n
2015-05-08 12:26:34
User: rdc
Functions: du sort
Tags: du usage disk

This command summarizes the disk usage across the files and folders in a given directory, including hidden files and folders beginning with ".", but excluding the directories "." and ".."

It produces a sorted list with the largest files and folders at the bottom of the list

function summaryIP() { < $1 awk '{print $1}' | while read ip ; do verifyIP ${ip} && echo ${ip}; done | awk '{ip_array[$1]++} END { for (ip in ip_array) printf("%5d\t%s\n", ip_array[ip], ip)}' | sort -rn; }
2015-05-01 16:45:05
User: mpb
Functions: awk echo read sort

Working with lists of IP addresses it is sometimes useful to summarize a count of how many times an IP address appears in the file.

This example, summarizeIP, uses another function "verifyIP" previously defined in commandlinefu.com to ensure only valid IP addresses get counted. The summary list is presented in count order starting with highest count.

timeDNS() { parallel -j0 --tag dig @{} "$*" ::: | grep Query | sort -nk5; }
du -sk -- * | sort -n | perl -pe '@SI=qw(K M G T P); s:^(\d+?)((\d\d\d)*)\s:$1." ".$SI[((length $2)/3)]."\t":e'
2015-04-26 08:07:27
Functions: du perl sort

Tested on MacOS and GNU/Linux.

It works in dirs containing files starting with '-'.

It runs 'du' only once.

It sorts according to size.

It treats 1K=1000 (and not 1024)

du -h -d 1 | ack '\d+\.?\d+G' | sort -hr
du -hsx * | sort -rh
sed -n '/url/s#^.*url=\(.*://.*\)#\1#p' ~/.mozilla/firefox/*.[dD]efault/SDBackups/*.speeddial | sort | uniq
2015-02-17 20:56:28
User: return13
Functions: sed sort

For all users of https://addons.mozilla.org/de/firefox/addon/speed-dial/

ls -l /dev/disk/by-id |grep -v "wwn-" |egrep "[a-zA-Z]{3}$" |sed 's/\.\.\/\.\.\///' |sed -E 's/.*[0-9]{2}:[0-9]{2}\s//' |sed -E 's/->\ //' |sort -k2 |awk '{print $2,$1}' |sed 's/\s/\t/'
2015-01-25 19:29:40
User: lig0n
Functions: awk egrep grep ls sed sort
Tags: zfs disk info

This is much easier to parse and do something else with (eg: automagically create ZFS vols) than anything else I've found. It also helps me keep track of which disks are which, for example, when I want to replace a disk, or image headers in different scenarios. Being able to match a disk to the kernels mapping of said drive the disks serial number is very helpful

ls -l /dev/disk/by-id

Normal `ls` command to list contents of /dev/disk/by-id

grep -v "wwn-"

Perform an inverse search - that is, only output non-matches to the pattern 'wwn-'

egrep "[a-zA-Z]{3}$"

A regex grep, looking for three letters and the end of a line (to filter out fluff)

sed 's/\.\.\/\.\.\///'

Utilize sed (stream editor) to remove all occurrences of "../../"

sed -E 's/.*[0-9]{2}:[0-9]{2}\s//'

Strip out all user and permission fluff. The -E option lets us use extended (modern) regex notation (larger control set)

sed -E 's/->\ //'

Strip out ascii arrows "-> "

sort -k2

Sort the resulting information alphabetically, on column 2 (the disk letters)

awk '{print $2,$1}'

Swap the order of the columns so it's easier to read/utilize output from

sed 's/\s/\t/'

Replace the space between the two columns with a tab character, making the output more friendly

For large ZFS pools, this made creating my vdevs immeasurably easy. By keeping track of which disks were in which slot (spreadsheet) via their serial numbers, I was able to then create my vols simply by copying and pasting the full output of the disk (not the letter) and pasting it into my command. Thereby allowing me to know exactly which disk, in which slot, was going into the vdev. Example command below.

zpool create tank raidz2 -o ashift=12 ata-... ata-... ata-... ata-... ata-... ata-...
ps axo pcpu,args | awk '/[p]hp.*pool/ { sums[$4] += $1 } END { for (pool in sums) { print sums[pool], pool } }' | sort -rn | column -t
find . -printf '%.5m %10M %#9u %-9g %TY-%Tm-%Td+%Tr [%Y] %s %p\n'|sort -nrk8|head
( ps -U nms -o pid,nlwp,cmd:500 | sort -n -k2) && (ps h -U nms -o nlwp | paste -sd+ | bc)
grep 'font-family:[^;]*' <input file.svg> | sed 's/.*font-family:\([^;]*\).*/\1/g' | sort | uniq
2014-11-03 20:38:08
User: caiosba
Functions: grep sed sort
Tags: fonts svg

List all fonts used by an SVG file. Useful to find out which fonts you need to have installed in order to open/edit an SVG file appropriately.