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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
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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.

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coloured shell prompt

This coloured prompt will show: username in green, grey "@" sign, hostname in red, current directory in yellow, typed commands in green.

Create a QR code image in MECARD format

Add the QR code image on your webpage, business card ., etc, so people can scan it and quick add to their Contact Address Book. Tested on iPhone with QRreader.

Show your current network interface in use

Which .service related this file?

I use this as an alias to get all .service files related a single installed file/conf (if it has services, of course). For rpm based systems ;)

Pause Current Thread

Hold ctrl and press z to pause the current thread. Run $fg to resume it.

Check if your desired password is already available in haveibeenpwnd database. This command uses the API provided by HIBP

Watch Aljazeera live

See how many more processes are allowed, awesome!

There is a limit to how many processes you can run at the same time for each user, especially with web hosts. If the maximum # of processes for your user is 200, then the following sets OPTIMUM_P to 100. $ OPTIMUM_P=$(( (`ulimit -u` - `find /proc -maxdepth 1 $ -user $USER -o -group $GROUPNAME $ -type d|wc -l`) / 2 )) This is very useful in scripts because this is such a fast low-resource-intensive (compared to ps, who, lsof, etc) way to determine how many processes are currently running for whichever user. The number of currently running processes is subtracted from the high limit setup for the account (see limits.conf, pam, initscript). An easy to understand example- this searches the current directory for shell scripts, and runs up to 100 'file' commands at the same time, greatly speeding up the command. $ find . -type f | xargs -P $OPTIMUM_P -iFNAME file FNAME | sed -n '/shell script text/p' I am using it in my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html especially for the xargs command. Xargs has a -P option that lets you specify how many processes to run at the same time. For instance if you have 1000 urls in a text file and wanted to download all of them fast with curl, you could download 100 at a time (check ps output on a separate [pt]ty for proof) like this: $ cat url-list.txt | xargs -I '{}' -P $OPTIMUM_P curl -O '{}' I like to do things as fast as possible on my servers. I have several types of servers and hosting environments, some with very restrictive jail shells with 20processes limit, some with 200, some with 8000, so for the jailed shells my xargs -P10 would kill my shell or dump core. Using the above I can set the -P value dynamically, so xargs always works, like this. $ cat url-list.txt | xargs -I '{}' -P $OPTIMUM_P curl -O '{}' If you were building a process-killer (very common for cheap hosting) this would also be handy. Note that if you are only allowed 20 or so processes, you should just use -P1 with xargs.

Shell recorder with replay

If you provide the option -t to the script command and redirect stderr into a file, the timing information on what is going on on the terminal, is also stored. You can replay the session via the scriptreplay command, where you can also provide a speedup factor (see the man page for details). Great for demonstration purposes ...

get all Amazon cloud (amazonws etc) ipv4 subnets

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