All commands

All commands (14,187)

sorted by

Send web page by e-mail

This will send the web page at $u to recipient@example.com . To send the web page to oneself, recipient@example.com can be replaced by $(whoami) or $USER. The "charset" is UTF-8 here, but any alternative charset of your choice would work. `wget -O - -o /dev/null $u` may be considered instead of `curl $u` . On some systems the complete path to sendmail may be necessary, for instance /sys/pkg/libexec/sendmail/sendmail for some NetBSD.
This is sample output - yours may be different.
-1

{ u="http://twitter.com/commandlinefu"; echo "Subject: $u"; echo "Mime-Version: 1.0"; echo -e "Content-Type: text/html; charset=utf-8\n\n"; curl $u ; } | sendmail $USER

pascalvaucheret · 2010-02-24 04:18:30 5
Burn an ISO on command line with hdiutil on mac
This is sample output - yours may be different.
0

hdiutil burn foo.iso

putnamhill · 2010-02-23 23:38:09 3
Burn an ISO on commandline with wodim instead cdrecord
This is sample output - yours may be different.
-2

wodim foo.iso

SlimG · 2010-02-23 21:58:31 3
A little bash daemon =)

You don't want the -ar parameters in this case. The man page for BASH_BUILTINS(1) states: "-a option means to remove or mark all jobs" and "-r option without a jobspec argument restricts operation to running jobs" In this case we are supplying the process id of the job to disown so neither of these should be used.
This is sample output - yours may be different.
-2

echo "Starting Daemon"; ( while :; do sleep 15; echo "I am still running =]"; done ) & disown -h $!

daleki · 2010-02-23 19:17:05 3
Using mplayer to play the audio only but suppress the video

Sometimes you only want to linsten the audio while output the video will be a waste of CPU resource and an annoying window. With option -vo null, you will enjoy the audio!
This is sample output - yours may be different.
9

mplayer -vo null something.mpg

foremire · 2010-02-23 16:36:36 18
show where symlinks are pointing

displays the output of ls -l without the rest of the crud. pretty simple but useful.
This is sample output - yours may be different.
2

lsli() { ls -l --color "$@" | awk '{ for(i=9;i<NF;i++){ printf("%s ",$i) } printf("%s\n",$NF) }'; }

quigybo · 2010-02-23 15:05:28 6
Recursively remove .svn directories
This is sample output - yours may be different.
1

find . -name .svn -exec rm -r {} +;

nishan_n · 2010-02-23 10:24:16 4
Recursively remove .svn directories
This is sample output - yours may be different.
-8

ls -RAx | grep "svn:$" | sed -e "s/svn:/svn/" | xargs rm -fr

ook · 2010-02-23 08:42:15 3
Recursively remove .svn directories

Recursively remove .svn directories from the current location.
This is sample output - yours may be different.
-2

rm -rf `find . -name .svn`

jfcalvo · 2010-02-23 08:35:06 5
Burn an ISO on commandline with wodim instead cdrecord
This is sample output - yours may be different.
1

wodim -v speed=4 dev='/dev/scd0' foo.iso

glako · 2010-02-22 21:56:11 3
Convert all .wav to .mp3

Audio convert is a script that uses zenity and lame to transcode virtually any format to any other format provided you have the libraries installed to do so.
This is sample output - yours may be different.
1

audio-convert <dir>/*

din7 · 2010-02-22 17:44:53 3
Convert all .wav to .mp3
This is sample output - yours may be different.
-3

ls *.wav | while read f; do lame "$f" -o "$(echo $f | cut -d'.' -f1)".mp3; done;

glaudiston · 2010-02-22 14:10:39 7
create a temporary file in a command line call

Sometimes you have a script that needs and inputfile for execution. If you don't want to create one because it may contain only one line you can use the ` mysql -uuser -ppass dbname < <(echo "SELECT * FROM database;") This can be very usefull when working with mysql as I showed in the example code above. This will create a temporary file that is used to execute mysql and for example select all entrys from a specific database.
This is sample output - yours may be different.
9

any_script.sh < <(some command)

cb0 · 2010-02-21 18:44:33 27
tail: watch a filelog

-f file(s) to be monitorized -n number of last line to be printed on the screen in this example, the content of two files are displayed
This is sample output - yours may be different.
5

tail -n 50 -f /var/log/apache2/access_log /var/log/apache2/error_log

warlock · 2010-02-21 14:45:44 4
Split a file one piece at a time, when using the split command isn't an option (not enough disk space)

bs = buffer size (basically defined the size of a "unit" used by count and skip) count = the number of buffers to copy (16m * 32 = 1/2 gig) skip = (32 * 2) we are grabbing piece 3...which means 2 have already been written so skip (2 * count) i will edit this later if i can to make this all more understandable
This is sample output - yours may be different.
2

dd if=inputfile of=split3 bs=16m count=32 skip=64

jearsh · 2010-02-21 10:09:46 3
Show the size of a directory

Displays only the subtotal size of a directory with the -s option, and in human readable format. Show Sample Output
This is sample output - yours may be different.
```
blaine@blaine-workstation:~$ du -sh .
11G     .
```
-5

du -sh some/directory

Jacolyte · 2010-02-21 02:08:28 38
Burn an ISO on the command line.
This is sample output - yours may be different.
2

cdrecord -v speed=4 driveropts=burnfree dev=/dev/scd0 cd.iso

Jacolyte · 2010-02-21 00:17:49 3
Extract a IRC like chat log out of an Adium xml logfile
This is sample output - yours may be different.
2

xmlstarlet sel -N x="http://purl.org/net/ulf/ns/0.4-02" -T -t -m "//x:message" -v "concat(substring(@time,12,5),' < ',@sender,'>', ' ',.)" -n

cbrinker · 2010-02-20 01:37:40 4
Find the real procesor speed when you use CPU scaling [cpuspeed]

We don't use CPU scaling, but just in case you do, there is something interesting to note. If you look at the /proc/cpuinfo, the speed listed is current running speed of the processors and not the real speed of the chip. Show Sample Output
This is sample output - yours may be different.
```
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
```
2

awk -F": " '/cpu MHz\ */ { print "Processor (or core) running speed is: " $2 }' /proc/cpuinfo ; dmidecode | awk -F": " '/Current Speed/ { print "Processor real speed is: " $2 }'

unixhome · 2010-02-19 21:20:18 238
Restrict the bandwidth for the SCP command

the command is obvious, I know, but maybe not everyone knows that using the parameter "-l" you can limit the use of bandwidth command scp. In this example fetch all files from the directory zutaniddu and I copy them locally using only 10 Kbs
This is sample output - yours may be different.
11

scp -l10 pippo@serverciccio:/home/zutaniddu/* .

0disse0 · 2010-02-19 16:44:24 13
ShadyURL via CLI
This is sample output - yours may be different.
1

SITE="www.google.com"; curl --silent "http://www.shadyurl.com/create.php?myUrl=$SITE&shorten=on" | awk -F\' '/is now/{print $6}'

allrightname · 2010-02-19 14:21:02 6
See your current RAM frequency

man dmidecode [look for type] Show Sample Output
This is sample output - yours may be different.
```
[root@ronfedora ~]# dmidecode -t 17 | awk -F":" '/Speed/ { print $2 }'
 533 MHz
 533 MHz
```
10

dmidecode -t 17 | awk -F":" '/Speed/ { print $2 }'

unixhome · 2010-02-19 12:15:13 13

Reconstruct a malformed authorizated_keys for ssh

when someone mail you his ssh public key, and the lines are broken with '\n', you can reconstruct a new file with one key by line with this command. Show Sample Output

pepin · 2010-02-19 08:32:35 3

See your current RAM frequency

Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:~$ sudo /usr/sbin/dmidecode | grep -i "current speed"
	Current Speed: 2800 MHz
	Current Speed: Unknown
	Current Speed: Unknown
	Current Speed: Unknown
	Current Speed: Unknown
```
4

/usr/sbin/dmidecode | grep -i "current speed"

eastwind · 2010-02-19 07:28:07 5
Cleanly quit KDE4 apps

Quit Kill Restart Plasma whenever it is hung!
This is sample output - yours may be different.
0

kbuildsycoca4 && kquitapp plasma-desktop && kstart plasma-desktop

freethinker · 2010-02-19 06:37:41 3
‹ First < 397 398 399 400 401 > 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

create a .avi with many .jpg

List all commands present on system

List all commands present on system by folder. $PATH contains all command folder separated by ':'. With ${PATH//:/ }, we change ':' in space and create a list of folder for ls command.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Get HTTP status code with curl

Put the machine to sleep after the download(wget) is done

[Note: This command needs to be run as root]. If you are downloading something large at night, you can start wget as a normal user and issue the above command as root. When the download is done, the computer will automatically go to sleep. If at any time you feel the computer should not go to sleep automatically(like if you find the download still continuing in the morning), just create an empty file called nosleep in /tmp directory.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Search and Replace across multiple files

- grep for the word in a files, use recursion (to find files in sub directories), and list only file matches -| xargs passes the results from the grep command to sed -sed -i uses a regular expression (regex) to evaluate the change: s (search) / search word / target word / g (global replace)

list block devices

Shows all block devices in a tree with descruptions of what they are.

Search for a string in all files recursively

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