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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.




Commands using sed from sorted by
Terminal - Commands using sed - 1,105 results
/bin/ls -lF "$@" | sed -r ': top; s/. ([0-9]+)([0-9]{3}[,0-9]* \w{3} )/ \1,\2/ ; t top'
2014-09-29 14:33:23
User: hackerb9
Functions: sed

This modifies the output of ls so that the file size has commas every three digits. It makes room for the commas by destructively eating any characters to the left of the size, which is probably okay since that's just the "group".

Note that I did not write this, I merely cleaned it up and shortened it with extended regular expressions. The original shell script, entitled "sl", came with this description:

 : '

 : For tired eyes (sigh), do an ls -lF plus whatever other flags you give

 : but expand the file size with commas every 3 digits. Really helps me

 : distinguish megabytes from hundreds of kbytes...


 : Corey Satten, corey@cac.washington.edu, 11/8/89

 : '

Of course, some may suggest that fancy new "human friendly" options, like "ls -Shrl", have made Corey's script obsolete. They are probably right. Yet, at times, still I find it handy. The new-fangled "human-readable" numbers can be annoying when I have to glance at the letter at the end to figure out what order of magnitude is even being talked about. (There's a big difference between 386M and 386P!). But with this nifty script, the number itself acts like a histogram, a quick visual indicator of "bigness" for tired eyes. :-)

sed -e "s/^ $(hostname).novalocal/" /etc/hosts
2014-09-25 15:38:43
User: renoirb
Functions: sed

When booting a VM through OpenStack and managed through cloudinit, the hosts file gets to write a line simiar to ns0.novalocal ns0

This command proven useful while installing a configuration manager such as Salt Stack (or Puppet, or Ansible) and getting node name

zcat error.log.gz | sed 's^\[.*\]^^g' | sed 's^\, referer: [^\n]*^^g' | sort | uniq -c | sort -n
2014-09-24 05:26:24
User: zanhsieh
Functions: sed sort uniq zcat
Tags: sort sed uniq zcat

credit shall fall to this for non-gzipped version:


sed -E "s/"$'\E'"\[([0-9]{1,3}((;[0-9]{1,3})*)?)?[m|K]//g"
sed 's/[0-9]\+/ [&] /g'
check () { URL=$(echo "$1"|cut -d/ -f3) ; if [[ $URL == *:* ]]; then nc -zvw5 $(echo $URL | sed 's/:/ /g'); else nc -zvw5 $URL 80; fi ;}
2014-09-16 20:09:40
User: zlemini
Functions: cut echo sed

This function tests the hostname:port from any url to see if it is accepting connections.

It uses netcat with a 5s timeout, if a port number is not part of the url passed to it, then default port 80 is tested.

ifconfig | egrep -A2 "eth|wlan" | tr -d "\n"| sed 's/\-\-/\n/g'|awk '{print "mac: "$5 " " $7}' | sed 's/addr:/addr: /g'
mysql -u{user} -p{password} -Ne "select distinct concat( \"SHOW GRANTS FOR '\",user,\"'@'\",host,\"';\" ) from user;" mysql | mysql -u {user} -p{password} | sed 's/\(GRANT .*\)/\1;/;s/^\(Grants for .*\)/## \1 ##/;/##/{x;p;x;}'
ifconfig | head -n 2 | tr -d '\n' | sed -n 's/.*\(00:[^ ]*\).*\(adr:[^ ]*\).*/mac:\1 - \2/p'
curl -sSi <URL> | sed '/^\r$/q'
2014-08-27 15:47:05
User: cbuckley
Functions: sed
Tags: curl http

Similar to the following:

curl -I <URL>

but curl -I performs a HEAD request, which can yield different results.

YEAR=2015; ncal 7 $YEAR | sed -n 's/^Fr.* \([^ ]\+\) *$/Jul \1/p'
2014-08-17 11:04:02
User: andreasS
Functions: sed
Tags: sed date

Calculate the date of Sysadmin day (last Friday of July) of any given year

changeFolder() { if [ $# -ne 2 ]; then echo "Usage: changeFolder old new"; return; fi; old=$(pwd); folder=$(echo "$old" | sed -e "s/$1/$2/g"); if [ ! -d "$folder" ]; then echo "Folder '$folder' not found."; return; fi; echo "$old -> $folder"; cd $folder;}
2014-07-29 15:36:32
User: Dracks
Functions: cd echo sed

change the path where you are, when is executed, is usefule when you've got folders to classify something like a tags, you've got devel/dist, android/ios, etc. like:



You can change between devel/project folder to dist/project without leave project.

If somebody has a better idea to do that without replace command.

docker ps -q | xargs -n 1 docker inspect | jq '.[0].NetworkSettings.Ports +{} | map(select(. != null)[0].HostPort) | map("-L \(.):localhost:\(.)") ' | sed -n 's/.*"\(.*\)".*/\1/p' |xargs boot2docker ssh -N
cat h.txt| while read line; do curl -s -X POST 'https://www.virustotal.com/vtapi/v2/file/report' --form apikey="APIKEY" --form resource="$line"|awk -F'positives\":' '{print "VTHits"$2}'|awk -F' ' '{print $1" "$2$5$6}'|sed 's/["}]//g' && sleep 15; done
sed -i "s/:\([a-zA-Z_]*\) =>/\1:/g" **/*.rb
2014-07-16 02:12:09
Functions: sed

Before: :key => 'value'

After: key: 'value'

I have only tested this a little, so please don't run this on anything important unless you have version control or other backups!

translate () {lang="ru"; text=`echo $* | sed 's/ /%20/g'`; curl -s -A "Mozilla/5.0" "http://translate.google.com/translate_a/t?client=t&text=$text&sl=auto&tl=$lang" | sed 's/\[\[\[\"//' | cut -d \" -f 1}
2014-07-10 18:26:34
User: 2b
Functions: cut sed

Change lang from ru to something else.

Curl version - Mac OS etc, any system w/o wget.

find . |xargs grep '<html\|<body\|<table' |sed '/~/d;s/:.*//' |sed 's/.*/mv & &.html/' |uniq >run.sh; sh run.sh
echo "btrfs checksum error(s) on: " && grep "btrfs: checksum error at logical" /var/log/messages | sed -e 's/^.*\( dev .*\)\(, sector.*\)\(path\: .*\))/\t\1, \3/' | sort | uniq
echo -e '\x2Hello, folks\t!\r' | sed "y/\x2\x9\xD\x20/&#9218;&#9225;&#9229;&#9248;/"
2014-06-30 14:42:15
User: hermannsw
Functions: echo sed

Not better, but more lightweight (sed instead of perl).

Above command is reduced due to length restriction of less than 256 characters and entity encoding of "Save" command on this page. This is complete command (best without entity encoding):

echo -e '\x2Helo folks\t!\r' | sed "y/\x0\x1\x2\x3\x4\x5\x6\x7\x8\x9\xA\xB\xC\xD\xE\xF\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F\x20/&#9216;&#9217;&#9218;&#9219;&#9220;&#9221;&#9222;&#9223;&#9224;&#9225;&#9226;&#9227;&#9228;&#9229;&#9230;&#9231;&#9232;&#9233;&#9234;&#9235;&#9236;&#9237;&#9238;&#9239;&#9240;&#9241;&#9242;&#9243;&#9244;&#9245;&#9246;&#9247;&#9248;/"


echo "Dave" | grep -o "bob" | sed 's/D/f/'; echo ${PIPESTATUS[1]};
2014-06-21 04:00:53
User: davethomas11
Functions: echo grep sed

Using the $PIPESTATUS array you can get the results of a command in a sequence of commands piped together. The command above returns the result of grep -o "bob", which is exit result of 1 since no match was made.

echo $(ifconfig) | egrep -o "en.*?inet [^ ]* " | sed 's/.*inet \(.*\)$/\1/' | tail -n +2
function google { Q="$@";GOOG_URL='https://www.google.com/search?tbs=li:1&q=';AGENT="Mozilla/4.0";stream=$(curl -A "$AGENT" -skLm 10 "${GOOG_URL}${Q//\ /+}");echo "$stream" | grep -o "href=\"/url[^\&]*&amp;" | sed 's/href=".url.q=\([^\&]*\).*/\1/';}
F=136; [[ $(($F % 4)) == 0 ]] && for i in $(seq 1 $(($F/4))); do echo -n $(($F-2*($i-1))),$((2*$i-1)),$((2*$i)),$(($F-2*$i+1)),; done | sed 's/,$/\n/' || echo "Make F a multiple of 4."
2014-06-11 01:21:08
User: Kayvlim
Functions: echo sed seq

Useful if you don't have at hand the ability to automatically create a booklet, but still want to.

F is the number of pages to print. It *must* be a multiple of 4; append extra blank pages if needed.

In evince, these are the steps to print it, adapted from https://help.gnome.org/users/evince/stable/duplex-npage.html.en :

1) Click File ▸ Print.

2) Choose the General tab.

Under Range, choose Pages.

Type the numbers of the pages in this order (this is what this one-liner does for you):

n, 1, 2, n-1, n-2, 3, 4, n-3, n-4, 5, 6, n-5, n-6, 7, 8, n-7, n-8, 9, 10, n-9, n-10, 11, 12, n-11...

...until you have typed n-number of pages.

3) Choose the Page Setup tab.

- Assuming a duplex printer:

Under Layout, in the Two-side menu, select Short Edge (Flip).

- If you can only print on one side, you have to print twice, one for the odd pages and one for the even pages.

In the Pages per side option, select 2.

In the Page ordering menu, select Left to right.

4) Click Print.

translate () {lang="ru"; text=$*; wget -U "Mozilla/5.0" -qO - "http://translate.google.com/translate_a/t?client=t&text=$text&sl=auto&tl=$lang" | sed 's/\[\[\[\"//' | cut -d \" -f 1}
2014-06-10 12:08:51
User: klisanor
Functions: cut sed wget
translate some text

Change lang from ru to something else.

docker ps | sed -e 's/ /\+/g' -e 's/CONTAINER ID/CONTAINER_ID/' | tr -s '+' '\t' | q -t 'select c1,substr(c7, 0, 40),c2,c6 from -' | column -t
2014-06-06 07:20:36
User: akaivola
Functions: column ps sed tr

When you run a lot of containers the built in docker ps output becomes unreadable. This command formats the output to be easier on the eyes.

Requires q (https://github.com/harelba/q) text as data.