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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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Print every Nth line

Sometimes commands give you too much feedback. Perhaps 1/100th might be enough. If so, every() is for you. $ my_verbose_command | every 100 will print every 100th line of output. Specifically, it will print lines 100, 200, 300, etc If you use a negative argument it will print the *first* of a block, $ my_verbose_command | every -100 It will print lines 1, 101, 201, 301, etc The function wraps up this useful sed snippet: $ ... | sed -n '0~100p' don't print anything by default $ sed -n starting at line 0, then every hundred lines ( ~100 ) print. $ '0~100p' There's also some bash magic to test if the number is negative: we want character 0, length 1, of variable N. $ ${N:0:1} If it *is* negative, strip off the first character ${N:1} is character 1 onwards (second actual character).

Working random fact generator

Though without infinite time and knowledge of how the site will be designed in the future this may stop working, it still will serve as a simple straight forward starting point. This uses the observation that the only item marked as strong on the page is the single logical line that includes the italicized fact. If future revisions of the page show failure, or intermittent failure, one may simply alter the above to read. $ wget randomfunfacts.com -O - 2>/dev/null | tee lastfact | grep \ | sed "s;^.*$.*$.*$;\1;" The file lastfact, can then be examined whenever the command fails.

pip install into current directory without virtualenv

For subsequent commands in the prefixed path: $ PYTHONPATH=$PWD/lib/python*/site-packages ./bin/pip --version

Delete only binary files in a directory

Please note that binary file checking is NOT perfect. So, use it with caution. It does not delete hidden files whose name has a leading '.' character. And it regards an empty file as a binary file.

Rename files with vim.

Opens a list of files in a text editor. Using Vim as your default editor allows you to use the power of regex substitution and visual block mode to batch rename files. Found in the renameutils package sudo apt-get install renameutils

Generate a random password 30 characters long

Synchronize date and time with a server over ssh

Set Remote Server Date using Local Server Time (push)

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

Check if you partition are aligned

To get most of you HDD/SSD driver you need to make sure you partition are aligned, if not the speed penalty can be up to 50% slower! this simple one liner will check to see if each partition start sector is divided by 512 you need to change sda with your driver if you find the one of your partitions is not aligned use gparted to move the start sector of the partition to be divided of 512

Erase empty files

The command find search commands with size zero and erase them.

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