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This is a command that I find myself using all the time. It works like regular grep, but returns the paragraph containing the search pattern instead of just the line. It operates on files or standard input. grepp <PATTERN> <FILE> or <SOMECOMMAND> | grepp <PATTERN> Show Sample Output

grepp() { [ $# -eq 1 ] && perl -00ne "print if /$1/i" || perl -00ne "print if /$1/i" < "$2";}

eightmillion · 2010-01-12 04:30:15 13

Edit video by cutting the part you like without transcoding.

Examples: The following will take frames starting at 15.2 seconds for a total of 45.9 seconds: mencoder -ss 15.2 -endpos 30.7 -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi Keep in mind -endpos is the total time, i.e. the output video in this is 3 minutes 3 seconds in length: mencoder -ss 1 minute -endpos 2 minutes 3 seconds -oac copy -ovc copy mymovie.avi -o myeditedmovie.avi
This is sample output - yours may be different.
8

mencoder -ss <start point> -endpos <time from start point> -oac copy -ovc copy <invid> -o <outvid>

Buzzcp · 2010-01-11 22:59:13 5
Show the command line of a process that use a specific port (ubuntu)

A way not so simple but functional for print the command for the process that's listening a specific port. I got the pid from lsof because I think it's more portable but can be used netstat netstat -tlnp Show Sample Output
This is sample output - yours may be different.
```
java -Dcom.sun.management.jmxremote -Xmx1024m -XX:MaxPermSize=300m -server -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8885 -jar /oc4j/j2ee/home/oc4j.jar 
```
0

port=8888;pid=$(lsof -Pan -i tcp -i udp | grep ":$port"|tr -s " " | cut -d" " -f2); ps -Afe|grep "$pid"|grep --invert-match grep | sed "s/^$[^ ]*[ ]*$\{7\}$.*$$/\2/g"

glaudiston · 2010-01-11 17:49:22 8
Change pidgin status

Changes pidgin status using its dbus interface. The status code can be obtained using command #4543.
This is sample output - yours may be different.
1

dbus-send --print-reply --dest=im.pidgin.purple.PurpleService /im/pidgin/purple/PurpleObject im.pidgin.purple.PurpleInterface.PurpleSavedstatusActivate int32:<WANTED STATE>

unixApe · 2010-01-11 17:35:23 4
Get current pidgin status

Returns code of current status of pidgin accounts via dbus interface Show Sample Output
This is sample output - yours may be different.
```
method return sender=:1.14 -> dest=:1.368 reply_serial=2
   int32 <SAVED STATE ID>
```
-1

dbus-send --print-reply --dest=im.pidgin.purple.PurpleService /im/pidgin/purple/PurpleObject im.pidgin.purple.PurpleInterface.PurpleSavedstatusGetCurrent

unixApe · 2010-01-11 17:30:07 3
Lookup your own IPv4 address
This is sample output - yours may be different.
5

dig +short myip.opendns.com @resolver1.opendns.com

grawity · 2010-01-11 17:00:32 8
Unlock your KDE4 session remotely (for boxes locked by KDE lock utility)

For KDE 4.2.* with plasma overlay activated I use this.
This is sample output - yours may be different.
0

qdbus org.kde.krunner_lock /MainApplication quit; qdbus org.kde.plasma-overlay /MainApplication quit

unixmonkey7806 · 2010-01-11 15:10:07 5
Find which process is using a port on Solaris

My old Solaris server does not have lsof, so I have to use pfiles.
This is sample output - yours may be different.
0

ps -ef | grep user | awk '{print $2}' | while read pid; do echo $pid ; pfiles $pid| grep portnum; done

sharfah · 2010-01-11 12:34:51 4
Execute a PHP script every 30 minutes using crontab

Just put this line in a file that resides in your /etc/cron.d/ folder, and you're set. The -q option is used to suppress php headers.
This is sample output - yours may be different.
-3

0,30 * * * * php -q /address/to/script.php

dotanmazor · 2010-01-11 10:44:13 6
This command will shorten any URL the user inputs. What makes this command different is that it utilizes 5 different services and gives you 5 different outputs.

This command will shorten any URL the user inputs. What makes this command different is that it utilizes 5 different services and gives you 5 different outputs: is.gd, bit.ly, u.nu, geekology.co.za, and tinyurl. curl -s http://tinyurl.com/create.php?url=$1 \ | sed -n 's/.*$http:\/\/tinyurl.com\/[a-z0-9][a-z0-9]*$.*/\1/p' \ | uniq ; curl -s http://bit.ly/?url=$1 \ | sed -n 's/.*$shortened-url" value="http:\/\/bit.ly\/[a-zA-Z0-9][a-zA-Z0-9]*$.*/\1/p' \ | sed -n 's/.*$http:\/\/bit.ly\/[a-zA-Z0-9][a-zA-Z0-9]*$.*/\1/p' \ | uniq ; curl -s http://geekology.co.za/shortii/create.php?u=$1 \ | sed -n 's/.*$http:\/\/geekology.co.za\/[a-z0-9][a-z0-9]*$.*/\1/p' \ | uniq ; curl -s http://u.nu/unu-api-simple?url=$1 \ | sed -n 's/.*$http:\/\/u.nu\/[a-z0-9][a-z0-9]*$.*/\1/p' \ | uniq ; curl -s http://is.gd/api.php?longurl=$1 \ | sed -n 's/.*$http:\/\/is.gd\/[a-z0-9][a-z0-9]*$.*/\1/p' \ | uniq echo ""
This is sample output - yours may be different.
0

curl -s http://tinyurl.com/create.php?url=$1 \ | sed -n 's/.*$http:\/\/tinyurl.com\/[a-z0-9][a-z0-9]*$.*/\1/p' \ | uniq ; curl -s http://bit.ly/?url=$1 \ | sed -n 's/.*\(shortened-url"...............

o0110o · 2010-01-11 01:11:27 7
A command to post a message and an auto-shortened link to Twitter. The link shortening service is provide by TinyURL.

A command to post a message and an auto-shortened link to Twitter. The link shortening service is provided by TinyURL.
This is sample output - yours may be different.
1

curl --user "USERNAME:PASSWORD" -d status="MESSAGE_GOES_HERE $(curl -s http://tinyurl.com/api-create.php?url=URL_GOES_HERE)" -d source="cURL" http://twitter.com/statuses/update.json -o /dev/null

o0110o · 2010-01-11 00:59:13 11
How many Linux and Windows devices are on your network?

Shows how many Windows and Linux devices are on your network. May add support for others, but that's all that are on my network right now. Show Sample Output
This is sample output - yours may be different.
```
3 Linux device(s)
2 Window(s) devices
```
3

sudo nmap -F -O 192.168.1.1-255 | grep "Running: " > /tmp/os; echo "$(cat /tmp/os | grep Linux | wc -l) Linux device(s)"; echo "$(cat /tmp/os | grep Windows | wc -l) Window(s) devices"

matthewbauer · 2010-01-10 03:09:56 5
Display $PATH with one line per entry

Display the $PATH with one line per entry, in a pager. Show Sample Output
This is sample output - yours may be different.
```
/home/nicoulaj/bin
/usr/local/sbin
/usr/local/bin
/usr/sbin
/usr/bin
/sbin
/bin
/usr/games
(END) 
```
0

echo -e ${PATH//:/\\n} | less

nicoulaj · 2010-01-09 23:25:02 4
hexadecimal2decimal
This is sample output - yours may be different.
-2

printf "%d\n" \0x64

4Aiur · 2010-01-09 02:50:50 3
Prevent overwriting file when using redirection

If you set noclobber to on, bash won't allow redirection to overwrite existing files . set -o noclobber command turn the option on (default it s off ) . You can still append information but not overwrite the file .to turn it back off use : $ set +o noclobber . I use it because i overwrite a file by accident , after thought , content of the file was very important , creating a one more file mean nothing for my hard disk (we are not anymore on the 64 k memory time) , but content of file is far much important . What we call exeprience :( Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:/tmp$ set -o noclobber
gnu@robby:/tmp$ cat  tesk
dffd
gnu@robby:/tmp$ cat > tesk
bash: tesk : impossible d'?craser le fichier existant
gnu@robby:/tmp$ cat  tesk
dffd
gnu@robby:/tmp$ cat >> tesk
fdf
gnu@robby:/tmp$ cat  tesk
dffd
fdf
gnu@robby:/tmp$ 
```
2

set -o noclobber

eastwind · 2010-01-08 21:06:44 7
Poor man's ntpdate

If you don't have netcat, you can use curl.
This is sample output - yours may be different.
1

date -s "`curl -sI www.example.com | sed -n 's/^Date: //p'`"

putnamhill · 2010-01-08 21:05:41 4
sirve para ver la salida de un comando en pantalla y al mismo tiempo guardar la salida en un fichero
This is sample output - yours may be different.
-6

find / -name *.conf | tee salida

dvinchi666 · 2010-01-08 20:53:37 3
Show recent earthquakes in Bay Area

To see only earthquakes for today, add another pipe to egrep "`date '+%Y/%m/%d'`" Show Sample Output
This is sample output - yours may be different.
```
 4.1  2010/01/07 10:09:35 37.481N 121.799W 11.0   10 km ( 6 mi) ENE of Milpitas, CA
 3.8  2010/01/08 11:48:50 37.478N 121.794W  8.1   10 km ( 6 mi) ENE of Milpitas, CA
 3.0  2010/01/06 23:09:00 37.410N 121.755W  9.1    8 km ( 5 mi) NE  of Alum Rock, CA
```
1

lynx --width=200 --dump 'http://quake.usgs.gov/recenteqs/Maps/San_Francisco_eqs.htm'|sed -ne '/MAG.*/,/^References/{;s/\[[0-9][0-9]*\]//;1,/h:m:s/d;/Back to map/,$d;/^$/d;/^[ \t][ \t]*[3-9]\.[0-9][0-9]*[ \t][ \t]*/p; }'|sort -k1nr

KevinM · 2010-01-08 20:52:28 3
Poor man's ntpdate

Good when firewalled and only in need of a reasonable accurate time. Use a fast responding web server.
This is sample output - yours may be different.
0

date -s "$(echo -e "HEAD / HTTP/1.0\n" | nc www.example.com 80 | sed -ne 's/^Date: $.*$$/\1/p')"

tomhol · 2010-01-08 20:05:00 9
Every Nth line position # (AWK)

A better way to show the file lines 3n + 1
This is sample output - yours may be different.
4

awk 'NR%3==1' file

point_to_null · 2010-01-08 18:52:24 9
get bofh excuse from a trusted source :-)
This is sample output - yours may be different.
7

telnet bofh.jeffballard.us 666

bubo · 2010-01-08 18:08:39 10
File browser

Simple file browser with dmenu, ls, and xdg-open.
This is sample output - yours may be different.
1

xdg-open $(ls . | dmenu)

matthewbauer · 2010-01-08 17:16:28 4
Find all files <10MB and sum up their size

files
This is sample output - yours may be different.
0

i=0; for f in $(find ./ -size -10M -exec stat -c %s {} \; ); do i=$(($i + $f)); done; echo $i

dakira · 2010-01-08 15:47:35 3
Prints line numbers
This is sample output - yours may be different.
0

awk '{print NR,$0}'

4Aiur · 2010-01-08 08:00:34 3
Every Nth line position # (AWK)

awk extract every nth line. Generic is: awk '{if (NR % LINE == POSITION) print $0}' foo where "last" position is always 0 (zero). Show Sample Output
This is sample output - yours may be different.
```
$ awk '{if (NR % 3 == 1) print $0}' blah1
1
4
7

$ awk '{if (NR % 3 == 2) print $0}' blah1
2
5
8

$ awk '{if (NR % 3 == 0) print $0}' blah1
3
6
9
```
-1

awk '{if (NR % 3 == 1) print $0}' foo > foo_every3_position1; awk '{if (NR % 3 == 2) print $0}' foo > foo_every3_position2; awk '{if (NR % 3 == 0) print $0}' foo > foo_every3_position3

oshazard · 2010-01-08 04:20:06 4
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Show git branches by date - useful for showing active branches

show the working directories of running processes

this shows the CWD of every running `java' command. YMMV but we often switch to a working directory for each service to start and run from there -- therefore this quicly shows what is running by a more meaningful name than command alone (the -bw prevents using blocking system calls which speeds this up quite a bit in the presence of remote mounted filesystems)

Output sound when your computer is downloading something

Outputs pseudo-random sounds to speakers (stereo mode because of -c 2) when there are any kind of network activity.

Install pip with Proxy

Installs pip packages defining a proxy

Realtime lines per second in a log file, with history

This is similar to standard `pv`, but it retains the rate history instead of only showing the current rate. This is useful for spotting changes. To do this, -f is used to force pv to output, and stderr is redirected to stdout so that `tr` can swap the carriage returns for new lines. (doesn't work correctly is in zsh for some reason. Tail's output isn't redirected to /dev/null like it is in bash. anyone know why? ???????)

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Backup a file with a date-time stamp

1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }

Install pip with Proxy

Installs pip packages defining a proxy

find out which directories in /home have the most files currently open

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" }

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