All commands sorted by votes

All commands (14,187)

sorted by

Reorder file with max 100 file per folder

Take a folder full of files and split it into smaller folders containing a maximum number of files. In this case, 100 files per directory. find creates the list of files xargs breaks up the list into groups of 100 for each group, create a directory and copy in the files Note: This command won't work if there is whitespace in the filenames (but then again, neither do the alternative commands :-)
This is sample output - yours may be different.
-1

files -type f | xargs -n100 | while read l; do mkdir $((++f)); cp $l $f; done

flatcap · 2011-02-15 23:15:16 4
view someone's twitter stream from terminal
This is sample output - yours may be different.
-1

grabtweets() { curl -s -o $GT_TMP twitter.com/$1 | cat $GT_TMP | grep entry-content | sed -e :loop -e 's/<[^>]*>//g;/</N;//bloop' | sed 's/^[ \t]*//'; }

gl101 · 2011-05-04 21:49:08 5
Get Google PageRank

via http://pagerank.bz/
This is sample output - yours may be different.
-1

curl pagerank.bz/yourdomain.com

random · 2011-09-02 09:01:52 3

addprinc

k add principle Show Sample Output

-1

kadmin -p admin@NOC.NBIRN.NET -q "addprinc -randkey host/host"

sysbot · 2009-02-05 23:20:14 14

Find all symlinks that link to directories

This will list all symlinks that are directories under the current directory. This will help you distinguish them from regular files.
This is sample output - yours may be different.
-1

ls -l $(find ./ -type l | perl -ne 'chomp; if (-d) { print "$_\n" }')

rwadkins · 2010-07-16 19:31:28 3
List the size (in human readable form) of all sub folders from the current location
This is sample output - yours may be different.
-1

du -hs *

crishoj · 2011-01-11 16:26:28 3
ktadd
This is sample output - yours may be different.
-1

kadmin -p admin@NOC.NBIRN.NET -q "ktadd -k /etc/krb5.keytab host/hostname"

sysbot · 2009-02-05 23:21:27 17
prints line numbers

There's too many options to number, My curiosity has forced me to make it using only sed. Maybe useful... or not... :-S
This is sample output - yours may be different.
-1

sed '/./=' infile | sed '/^/N; s/\n/ /'

glaudiston · 2009-12-10 16:24:56 6
Get Google Reader unread count

Get Google Reader unread count from the command line. You'll have to define your auth token with $auth Or use: curl -s -H "Authorization: GoogleLogin auth=$(curl -sd "Email=$email&Passwd=$password&service=reader" https://www.google.com/accounts/ClientLogin | grep Auth | sed 's/Auth=$.*$/\1/')" "http://www.google.com/reader/api/0/unread-count?output=json" | tr '{' '\n' | sed 's/.*"count":$[0-9]*$,".*/\1/' | grep -E ^[0-9]+$ | tr '\n' '+' | sed 's/$.*$+/\1\n/' | bc Show Sample Output
This is sample output - yours may be different.
```
33
```
-1

curl -s -H "Authorization: GoogleLogin auth=$auth" "http://www.google.com/reader/api/0/unread-count?output=json" | tr '{' '\n' | sed 's/.*"count":$[0-9]*$,".*/\1/' | grep -E ^[0-9]+$ | tr '\n' '+' | sed 's/$.*$+/\1\n/' | bc

matthewbauer · 2010-02-11 00:42:57 7
20char long alpahnumeric "password"

20characters long alpahnumeric "password" Show Sample Output
This is sample output - yours may be different.
```
5698d846bfe078d67aef43fc0eebe4233401ad23
```
-1

head -c20 /dev/urandom | xxd -ps

opexxx · 2013-07-16 10:14:21 8
backup file with tar

backup your files in tar archive + timestamp of backup Show Sample Output
This is sample output - yours may be different.
```
medamin@inismhost:~/Documents/Developement/conf/bind9$ tar -cvf bind9-config-`date +%s`.tar *
db.192
db.192~
db.host.go
db.host.go~
named.conf.local
named.conf.local~
named.conf.options
named.conf.options~
medamin@inismhost:~/Documents/Developement/conf/bind9$
```
-1

tar -cvf bind9-config-`date +%s`.tar *

Fuonum · 2014-10-29 05:15:15 9
Login via SSH
This is sample output - yours may be different.
-1

ssh -l <username> <server>

bronskyb · 2011-05-05 11:38:56 4
Netcat ftp honeypot centos linux (use port 22 for SSH)

[root@dhcppc1 windows]# cat /var/log/honeylog.log Connection from 192.168.1.71 port 21 [tcp/ftp] accepted Connection from 192.168.1.65 port 21 [tcp/ftp] accepted [root@dhcppc1 windows]# nc 192.168.1.65 21 220 ProFTPD 1.3.3c Server [ProFTPD] FAILED FTP ATTEMPT - PORT 21 *You can not run it if you have activated the ftp server.
This is sample output - yours may be different.
-1

while [ 1 ]; do echo -e "220 ProFTPD 1.3.3c Server [ProFTPD] \nFAILED FTP ATTEMPT - PORT 21" | nc -vvv -l 192.168.1.65 21 >> /var/log/honeylog.log 2>> /var/log/honeylog.log; done

xmuda · 2013-07-16 19:05:37 6
Check out hijacked files in clearcase
This is sample output - yours may be different.
-1

cleartool co -nc `cleartool ls -recurse | grep "hijacked" | sed s/\@\@.*// | xargs`

ultrahax · 2009-02-06 00:03:51 51
kalarm 1 per minute simplest e-mail beacom for Geovision surveillance DVR

I have a custmer's Geovision DVR installed on a closed proxi (only logme-in reaches it). I have to check for reliability but logmein hangs and is too slow a process I made the Geovision software send e-mail every minute to the www.spam.la site. All this script does is to retrieve the e-mail header from spam.la ( no login!), filtering sender, stopping at the first occurrence of the word "secs" ( the age of the last e-mail ). The result is the age of the sender's last e-mail, tiny published on top of my screen once a minute. I can refresh www.spam.la via web browser, but have other things to do. I use it inside Kalarm ( kde task schedule ) set to 1 minute repeat. It can be done without kalarm, using Watch outside the script. Try it out now using my account = geo1 ( change sender by geo1 in this script) Needs curl , osd-bin
This is sample output - yours may be different.
-1

curl http://www.spam.la/?f=sender | grep secs| awk '{print; exit}' | osd_cat -i 40 -d 30 -l 2

m33600 · 2009-11-12 21:33:06 5
Echo exit status (a.k.a. return code)

I often find it useful to know what the exit status for a program was. This can be helpful when looking up errors by exit status or when scripting frequent commands. Taken from http://www.faqs.org/docs/abs/HTML/exit-status.html Show Sample Output
This is sample output - yours may be different.
```
echo hello
echo $?    # Exit status 0 returned because command executed successfully.
0
ls foo
echo $?    # Exit status 2 returned because command failed (value depends on command, see man page).
2
```
-1

echo $?

lucasrangit · 2011-07-27 15:34:20 3
sets desktop background using zenity

Assuming you have zenity installed, and assuming that you keep your backgrounds in ~/backgrounds, then this should work for you! :)
This is sample output - yours may be different.
-1

zenity --list --width 500 --height 500 --column 'Wallpapers' $(ls) | xargs xsetbg -center -smooth -fullscreen

TheShadowFog · 2011-11-15 02:44:48 4
free some harddrive space by garbage collecting in all your git repos

Assumes you've cd'd to the folder in which all your git repos reside; you could run it from ~ without -maxdepth, although that might make find take quite a while longer. If you have several processor cores, but not that much ram, you might want to run git config --global pack.threads 1 first, since gc-ing can eat lots of ram. Show Sample Output
This is sample output - yours may be different.
```
Counting objects: 1969, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (579/579), done.
Writing objects: 100% (1969/1969), done.
Total 1969 (delta 1334), reused 1969 (delta 1334)
Counting objects: 12491, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (2997/2997), done.
Writing objects: 100% (12491/12491), done.
Total 12491 (delta 9355), reused 12491 (delta 9355)
```
-1

find . -maxdepth 2 -type d -name '.git' -print0 | while read -d ''; do (cd "$REPLY"; git gc); done

unhammer · 2012-11-07 08:38:33 4
Import an entire directory into clearcase
This is sample output - yours may be different.
-1

ct mkelem -nc `find ./ -name "*" | xargs`

ultrahax · 2009-02-06 00:04:31 46
Windows person acting like an idiot in Linux?

Is there somebody that uses Windows a lot that keeps messing up your Linux machine? Press Ctrl+Alt+F1-F6 and run this command after logging into a text shell!
This is sample output - yours may be different.
-1

export PS1="C:\\>"; clear

ThePCKid · 2011-06-18 17:52:42 5
bash function to "highlight" tabs and linebreaks

I don't think it's possible to give a (background) colour to the tab itself, since a tab is, IIUC, simply a command to the terminal to move to the right. Nevertheless, this "highlighting" can be helpful when working with tab-separated files. Show Sample Output
This is sample output - yours may be different.
```
$ echo -e 'foo\tbar\nfie\tfum'|hl-nonprinting 
foo&#9657;    bar&#8267;
fie&#9657;    fum&#8267;
```
-1

hl-nonprinting () { local C=$(printf '\033[0;36m') R=$(printf '\033[0m'); sed -e "s/\t/${C}▹&$R/g" -e "s/$/${C}⁋$R/";}

unhammer · 2012-11-07 09:55:48 4
Btrfs: Find file names with checksum errors

Btrfs reports the inode numbers of files with failed checksums. Use `find` to lookup the file names of those inodes.
This is sample output - yours may be different.
-1

dmesg | grep -Po 'csum failed ino\S* \d+' | sort | uniq | xargs -n 3 find / -inum 2> /dev/null

Sepero · 2014-03-20 06:27:15 10
webcam player in ascii art

Use gstreamer to capture v4l2:///dev/video0 and show ascii art video in display.
This is sample output - yours may be different.
-1

gst-launch v4l2src ! aasink

rubenrua · 2009-02-18 22:17:53 5
gmail safe folder

Returns any file in the folder which would be rejected by Gmail, if you were to send zipped version. (Yes, you could just zip it and knock the extension off and put it back on the other side, but for some people this just isn't a solution) Show Sample Output
This is sample output - yours may be different.
```
./.local/share/Trash/files/run.bat
./.wine/drive_c/Program Files/Nuance/PDF Reader/bin/ZPortfolioRes.dll
./.wine/drive_c/Program Files/Nuance/PDF Reader/bin/zrtf.dll
./.wine/drive_c/Program Files/Nuance/PDF Reader/bin/ztypeset.dll
./writeup/lib/mempatch.ins
./writeup/lib/memoir.ins
```
-1

find | egrep "\.(ade|adp|bat|chm|cmd|com|cpl|dll|exe|hta|ins|isp|jse|lib|mde|msc|msp|mst|pif|scr|sct|shb|sys|vb|vbe|vbs|vxd|wsc|wsf|wsh)$"

poulter7 · 2010-11-23 16:53:55 10
bash function to highlight non-printing characters: tab, newline, BOM, nbsp

Can't see it here, but the non-breaking space is highlighted :) Of course, cat -t -e achieves something similar, but less colourful. Could add more code points from https://en.wikipedia.org/wiki/Space_%28punctuation%29#Spaces_in_Unicode Show Sample Output
This is sample output - yours may be different.
```
$ env printf '\uFEFFfoo\u00A0bar\nfie\tfum'|hl-nonprinting 
 foo? bar&#8267;
fie&#9657;    fum&#8267;
```
-1

hl-nonprinting () { local C=$(printf '\033[0;36m') B=$(printf '\033[0;46m') R=$(printf '\033[0m') np=$(env printf "\u00A0\uFEFF"); sed -e "s/\t/${C}▹&$R/g" -e "s/$/${C}⁋$R/" -e "s/[$np]/${B}& $R/g";}

unhammer · 2012-11-07 10:09:40 9
‹ First < 495 496 497 498 499 > Last ›

What's this?

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

Share Your Commands

Check These Out

Function to check whether a regular file ends with a newline

tail -c 1 "$1" returns the last byte in the file. Command substitution deletes any trailing newlines, so if the file ended in a newline $(tail -c 1 "$1") is now empty, and the -z test succeeds. However, $a will also be empty for an empty file, so we add -s "$1" to check that the file has a size greater than zero. Finally, -f "$1" checks that the file is a regular file -- not a directory or a socket, etc.

Backup your hard drive with dd

This will create an exact duplicate image of your hard drive that you can then restore by simply reversing the "if" & "of" locations. $ sudo dd if=/media/disk/backup/sda.backup of=/dev/sda Alternatively, you can use an SSH connection to do your backups: $dd if=/dev/sda | ssh user@ssh.server.com dd of=~/backup/sda.backup

'hpc' in the box - starts a maximum of n compute commands modulo n controlled in parallel

the block of the loop is useful whenever you have huge junks of similar jobs, e.g., convert high res images to thumbnails, and make usage out of all the SMP power on your compute box without flooding the system. note: c is used as counter and the random sleep $ r=`echo $RANDOM%5 |bc`; echo "sleep $r"; sleep $r is just used as a dummy command.

Find broken symlinks and delete them

If you don't want to delete them, but just want to list them, do $ find -L /path -type l If you want to delete them with confirmation first, do $ find -L /path -type l -exec rm -i {} + Using the -L flag follows symlinks, so the -type l test only returns true if the link can't be followed, or is a symlink to another broken symlink.

List processes sorted by CPU usage

Show the UUID of a filesystem or partition

Shows the UUID of the given partition (here /dev/sda7). Doesn't need to be root.

posts an xml file to a webservice with curl

Url Encode

It only encodes non-Basic-ASCII chars, as they are the only ones not well readed by UTF-8 and ISO-8859-1 (latin-1). It converts all * C3 X (some latin symbols like ASCII-extended ones) and * C2 X (some punctuation symbols like inverted exclamation) ...UTF-8 double byte symbols to escaped form that every parser understands to form the URLs. I didn't encode spaces and the rest of basic punctuation, but supposedly, space and others are coded as \x20, for example, in UTF-8, latin-1 and Windows-cp1252.... so its read perfectly. Please feel free to correct, the application to which I designe that function works as expected with my assumption. Note: I specify a w=999, I didn't find a flag to put unlimited value. I just suppose very improbable surpass the de-facto 255 (* 3 byte max) = 765 bytes length of URL

Replace spaces in filenames with underscorees

Disassemble some shell code

This one liner takes the shell code that you can grab off of the web and disassemble it into readable assembly so you can validate the code does what it says, before using it. The shell code in the above example is from http://www.shell-storm.org/shellcode/files/shellcode-623.php You can replace "-s intel" with "-s att" to get AT&T format disassembly.

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)

All commands (14,187) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

All commands (14,187)

sorted by