Hide

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.

OpenID
or
Sign in Register

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

Hide

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:

Hide

News

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

Commands using uniq from sorted by
Terminal - Commands using uniq - 211 results
netstat -antu | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -n
2013-04-08 19:46:41
User: wejn
Functions: awk netstat sort uniq
Tags: netstat connections
-1
Up
Down
Show number of connections per remote IP

Output contains also garbage (text parts from netstat's output) but it's good enough for quick check who's overloading your server.

Comments (4) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
git log | grep Date | awk '{print " : "$4" "$3" "$6}' | uniq -c
2013-03-27 14:37:32
User: La0
Functions: awk grep uniq
Tags: git date commit working day
0
Up
Down
Number of commits per day in a git repository
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find /some/path -type f -printf '%f\n' | grep -o '\..\+$' | sort | uniq -c | sort -rn
2013-03-18 14:42:29
User: skkzsh
Functions: find grep sort uniq
Tags: sort uniq find grep extension
2
Up
Down
list unique file extensions recursively for a path, include extension frequency stats

Get the longest match of file extension (Ex. For 'foo.tar.gz', you get '.tar.gz' instead of '.gz')

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find /some/path -type f | gawk -F/ '{print $NF}' | gawk -F. '/\./{print $NF}' | sort | uniq -c | sort -rn
2013-03-18 14:40:26
User: skkzsh
Functions: find gawk sort uniq
Tags: sort awk uniq find extension
0
Up
Down
list unique file extensions recursively for a path, include extension frequency stats

If you have GNU findutils, you can get only the file name with

find /some/path -type f -printf '%f\n'

instead of

find /some/path -type f | gawk -F/ '{print $NF}'
Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
DATE=`date +"%H:%M" --date '-1 min'`; egrep "\ $DATE\:..\ " /var/log/dhcpd.log |awk '/DHCPREQUEST/ {split($3,t,":"); printf("%02d:%02d\n",t[1],t[2]);}' |uniq -c;
2013-03-17 02:23:37
User: jobewan
Functions: awk egrep uniq
0
Up
Down
Display count of log entries via the previous minute for graphing purposes. Example given is for DHCPREQUESTS on an ISC dhcp service log.
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
while (true); do date --utc; done | uniq -c
2013-03-15 12:05:37
User: hute37
Functions: date uniq
Tags: cygwin performance
2
Up
Down
fork performance test

grabbed from Andrew Aylett post:

http://superuser.com/questions/133313/can-i-speed-up-cygwins-fork

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find . -type f -size +0 -printf "%-25s%p\n" | sort -n | uniq -D -w 25 | sed 's/^\w* *\(.*\)/md5sum "\1"/' | sh | sort | uniq -w32 --all-repeated=separate
2013-02-23 20:44:20
User: jimetc
Functions: find sed sh sort uniq
0
Up
Down
Find Duplicate Files (based on size first, then MD5 hash)

Avoids the nested 'find' commands but doesn't seem to run any faster than syssyphus's solution.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sort file.txt | uniq -c | sort -k1nr -k2d
2013-01-28 22:21:05
User: westonruter
Functions: sort uniq
Tags: bash sorting
0
Up
Down
Count unique lines in file sorted by instance count (descending) and alphabetically (ascending)

I used to do this sorting with:

sort file.txt | uniq -c | sort -nr

But this would cause the line (2nd column) to be sorted in descending (reverse) order as well sa the 1st column. So this will ensure the 2nd column is in ascending alphabetical order.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find-duplicates () { find "$@" -not -empty -type f -printf "%s\0" | sort -rnz | uniq -dz | xargs -0 -I{} -n1 find "$@" -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate; }
2013-01-23 23:20:26
User: mpeschke
Functions: find md5sum sort uniq xargs
Tags: bash sort uniq find md5sum xarg
0
Up
Down
Find Duplicate Files (based on size first, then MD5 hash)

This is a modified version of the OP, wrapped into a bash function.

This version handles newlines and other whitespace correctly, the original has problems with the thankfully rare case of newlines in the file names.

It also allows checking an arbitrary number of directories against each other, which is nice when the directories that you think might have duplicates don't have a convenient common ancestor directory.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find $folder -name "[1-9]*" -type f -print|while read file; do echo $file $(sed -e '/^$/Q;:a;$!N;s/\n //;ta;s/ /_/g;P;D' $file|awk '/^Received:/&&!r{r=$0}/^From:/&&!f{f=$0}r&&f{printf "%s%s",r,f;exit(0)}');done|sort -k 2|uniq -d -f 1
2013-01-21 22:50:51
User: lpb612
Functions: awk echo find read sed sort uniq
2
Up
Down
find duplicate messages in a Maildir

# find assumes email files start with a number 1-9

# sed joins the lines starting with " " to the previous line

# gawk print the received and from lines

# sort according to the second field (received+from)

# uniq print the duplicated filename

# a message is viewed as duplicate if it is received at the same time as another message, and from the same person.

The command was intended to be run under cron. If run in a terminal, mutt can be used:

mutt -e "push otD~=xq" -f $folder

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
tail -1000 `ls -ltr /var/log/CF* |tail -1|awk '{print $9}'`|cut -d "," -f 17|sort|uniq -c |sort -k2
2012-11-30 16:30:41
User: raindylong
Functions: awk cut sort tail uniq
0
Up
Down
count & sort one field of the log files

count & sort one field of the log files , such as nginx/apache access log files .

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find . -type f -print | awk -F'.' '{print $NF}' | sort | uniq -c
2012-10-31 12:03:10
User: vishnu81
Functions: awk find sort uniq
Tags: awk find
0
Up
Down
List all the unique extensions in a folder and print their count
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
tshark -qr [cap] -z conv,tcp | awk '{printf("%s:%s:%s\n",$1,$3,$10)}' | awk -F: '{printf("%s %s %s\n",$1,$3,substr($5,1,length($5)-10))}' | sort | uniq -c | sort -nr
2012-10-16 06:39:01
User: knassery
Functions: awk sort uniq
Tags: network performance awk, sort tshark
-1
Up
Down
Tshark to Generate Top Talkers by #TCP conv started per second.

#_connects src_IP dst_IP When_It_Happened_Secs

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
tcpdump -ntr NAME_OF_CAPTURED_FILE.pcap 'tcp[13] = 0x02 and dst port 80' | awk '{print $4}' | tr . ' ' | awk '{print $1"."$2"."$3"."$4}' | sort | uniq -c | awk ' {print $2 "\t" $1 }'
2012-08-22 21:26:10
User: efuoax
Functions: awk sort tcpdump tr uniq
Tags: awk uniq tcpdump print
1
Up
Down
Read a tcpdump file and count SYN packets to port 80, Order column by destination.
Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
sort namesd.txt | uniq ?cd
2012-06-26 19:23:58
User: ankush108
Functions: sort uniq
Tags: sort duplicate unique uni
0
Up
Down
Show duplicate lines in a file

The following displays only the entries that are duplicates.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
netstat -tn | grep :80 | awk '{print $5}'| grep -v ':80' | cut -f1 -d: |cut -f1,2,3 -d. | sort | uniq -c| sort -n
2012-06-26 08:29:37
User: krishnan
Functions: awk cut grep netstat sort uniq
Tags: sort awk IP grep netstat connection range user
0
Up
Down
Number of connections per IP with range 24

cut -f1,2 - IP range 16

cut -f1,2,3 - IP range 24

cut -f1,2,3,4 - IP range 24

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
git ls-files | xargs -n1 git blame --line-porcelain | sed -n 's/^author //p' | sort -f | uniq -ic | sort -nr
2012-06-02 22:04:36
User: hugopeixoto
Functions: sed sort uniq xargs
Tags: statistics git
1
Up
Down
Prints per-line contribution per author for a GIT repository

Uses line-porcelain in git blame, which makes it easier to parse the output.

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
mysqlbinlog <logfiles> | grep exec | grep end_log_pos | cut -d' ' -f2- | cut -d: -f-2 | uniq -c
2012-05-30 09:42:21
User: theist
Functions: cut exec grep uniq
Tags: uniq grep cut mysqlbinlog
1
Up
Down
mysql bin log events per minute

shows number of mysql bin log events (which are mysql server events) per minute, useful to check stress times postmortem

Show sample output | Comments (5) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
lsof +c 15 | awk '{print $1}' | sort | uniq -c | sort -rn | head
2012-05-25 16:31:46
User: SEJeff
Functions: awk sort uniq
Tags: Linux lsof
1
Up
Down
Top 15 processes with the largest number of open files

See the summary.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
cat /var/log/nginx/access.log | grep -oe '^[0-9.]\+' | perl -ne 'system("geoiplookup $_")' | grep -v found | grep -oe ', [A-Za-z ]\+$' | sort | uniq -c | sort -n
2012-05-08 13:28:25
User: theist
Functions: cat grep perl sort uniq
Tags: sort uniq geoip
-1
Up
Down
Per country GET report, based on access log. Easy to transform to unique IP

Per country GET report, based on access log. Easy to transform to unique IP

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
for a in $(find . -xdev -type f -printf '%i\n'|sort|uniq -d);do find . -xdev -inum $a -printf '%s %i %m %n %U %G %AD %Ar %p\n';done|sort -n|awk '{if(x!=$2){print "---"};x=$2;print $0}'
2012-04-09 12:52:07
User: knoppix5
Functions: awk find sort uniq
0
Up
Down
Sort by size all hardlinked files in the current directory (and subdirectories)

The listing will be nice separated with dashes in chunks of identical files.

Output format:

Size Inode Mode Count_of_identical_files UID GID Date Time Path/Filename

Show sample output | Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find . -type f -print0 | xargs -0 -n1 md5sum | sort -k 1,32 | uniq -w 32 -d --all-repeated=separate | sed -e 's/^[0-9a-f]*\ *//;'
2012-04-03 07:03:09
User: hogofogo
Functions: find md5sum sed sort uniq xargs
0
Up
Down
Print duplicate files
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
history | awk '{print $2}' | awk 'BEGIN {FS="|"}{print $1}' | sort | uniq -c | sort -nr | head
2012-04-03 06:33:47
User: hogofogo
Functions: awk sort uniq
0
Up
Down
Top 10 commands used
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
find /some/path -type f -and -printf "%f\n" | egrep -io '\.[^.]*$' | sort | uniq -c | sort -rn
2012-04-02 19:25:35
User: kyle0r
Functions: egrep find sort uniq
Tags: uniq ls grep
0
Up
Down
list unique file extensions recursively for a path, include extension frequency stats

the

find -printf "%f\n" prints just the file name from the given path. This means directory paths which contain extensions will not be considered.
Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
head -n1 nation.tbl | sed 's/\(.\)/\1\n/g' | sort | uniq -c | grep \| | awk '{ print $1 }'
2012-03-03 12:35:58
User: maarten
Functions: awk grep head sed sort uniq
0
Up
Down
Count Number of Columns in TPC-H table-file (or any pipe seperated file
Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate