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
rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs
2009-03-15 22:18:17
User: mpb
Functions: head nl rpm sort

Low on disk space? Check the largest installed RPMs for delete canditates.

sort file1.txt | uniq > file2.txt
ls -l|awk '{print $6,$8}'|sort -d
2009-03-13 19:00:18
User: archlich
Functions: awk ls sort

Can pipe to tail or change the awk for for file size, groups, users, etc.

grep Mar/2009 /var/log/apache2/access.log | awk '{ print $1 }' | sort -n | uniq -c | sort -rn | head
cat $(ls -tr | tail -1) | awk '{ a[$1] += 1; } END { for(i in a) printf("%d, %s\n", a[i], i ); }' | sort -n | tail -25
2009-03-06 17:50:29
User: oremj
Functions: awk cat ls sort tail

This command is much quicker than the alternative of "sort | uniq -c | sort -n".

find . -type f -print0 | xargs -r0 stat -c %Y\ %n | sort -rn | gawk '{sub(/.\//,"",$2); print $2}' > /tmp/playlist.m3u
2009-03-04 16:41:02
User: microft
Functions: find gawk sort stat xargs

I use this to generate a playlist with all the podcasts I listen to.

Ordered from most recent to older.

du | sort -n | tail -11 | head
2009-03-04 16:06:34
User: phage
Functions: du sort tail

The pipe to head removes the listing of . as the largest directory.

zgrep "Failed password" /var/log/auth.log* | awk '{print $9}' | sort | uniq -c | sort -nr | less
2009-03-03 13:45:56
User: dbart
Functions: awk sort uniq zgrep

This command checks for the number of times when someone has tried to login to your server and failed. If there are a lot, then that user is being targeted on your system and you might want to make sure that user either has remote logins disabled, or has a strong password, or both. If your output has an "invalid" line, it is a summary of all logins from users that don't exist on your system.

gunzip -c /var/log/auth.log.*.gz | cat - /var/log/auth.log /var/log/auth.log.0 | grep "Invalid user" | awk '{print $8;}' | sort | uniq -c | less
du -cs * .[^\.]* | sort -n
2009-03-02 18:43:48
User: cemsbr
Functions: du sort

Very useful when you need disk space. It calculates the disk usage of all files and dirs (descending them) located at the current directory (including hidden ones). Then sort puts them in order.

sort -nt . -k 1,1 -k 2,2 -k 3,3 -k 4,4
2009-02-26 20:22:57
User: sysadmn
Functions: sort

Sort a list of IPV4 addresses in numerical order. Great as a filter, or within vim using !}

sort -bdf
2009-02-26 19:55:41
User: sysadmn
Functions: sort

Often, when sorting you want the sort to ignore extraneous characters. The b, d, and f tell sort to ignore leading blanks, use 'dictionary order' (ignore punctuation), and ignore (fold) case. Add a "u" if you only want one copy of duplicate lines.

This is a great command to use within vim to sort lines of text, using !}sort -bdf

du --max-depth=1 | sort -r -n | awk '{split("k m g",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}'
2009-02-24 11:03:08
User: hans
Functions: awk du sort

I use this on debian testing, works like the other sorted du variants, but i like small numbers and suffixes :)

find . -type d | perl -nle 'print s,/,/,g," $_"' | sort -n | tail
find . -type f -name "*.java" -print0 | xargs -0 -n 1 svn blame | sed -n 's/^[^a-z]*\([a-z]*\).*$/\1/p' | sort | uniq -c | sort -n
sed -e "s/| /\n/g" ~/.bash_history | cut -d ' ' -f 1 | sort | uniq -c | sort -nr | head
"some line input" | sort | uniq -c | sort -nr
sed 's/[ \t]*$//' < emails.txt | tr 'A-Z' 'a-z' | sort | uniq > emails_sorted.txt
du -b --max-depth 1 | sort -nr | perl -pe 's{([0-9]+)}{sprintf "%.1f%s", $1>=2**30? ($1/2**30, "G"): $1>=2**20? ($1/2**20, "M"): $1>=2**10? ($1/2**10, "K"): ($1, "")}e'
comm -1 -2 <(sort file1) <(sort file2)
cat foo.csv bar.csv | sort -t "," -k 2 | uniq
2009-02-19 20:23:03
User: rafeco
Functions: cat sort

The value for the sort command's -k argument is the column in the CSV file to sort on. In this example, it sorts on the second column. You must use some form of the sort command in order for uniq to work properly.

lsof | awk '{print $1}' | sort | uniq -c | sort -rn | head
sed -n -e '/postfix\/smtp\[.*status=sent/s/^.*to=<\([^>]*\).*$/\1/p' /var/log/mail.log | sort -u
netstat -alpn | grep :80 | awk '{print $4}' |awk -F: '{print $(NF-1)}' |sort | uniq -c | sort -n
last | grep -v "^$" | awk '{ print $1 }' | sort -nr | uniq -c
2009-02-18 16:38:59
User: hkyeakley
Functions: awk grep last sort uniq

This command takes the output of the 'last' command, removes empty lines, gets just the first field ($USERNAME), sort the $USERNAMES in reverse order and then gives a summary count of unique matches.