Commands using egrep sorted by votes

Commands using egrep (220)

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Kill any process with one command using program name

Somtime one wants to kill process not by name of executable, but by a parameter name. In such cases killall is not suitable method.
This is sample output - yours may be different.
4

kill -9 `ps ax | egrep [f]elix.jar | egrep -o -e '^ *[0-9]+'`

yababay · 2010-09-30 16:45:47 3
Get IP from hostname

Get the IP of a hostname.
This is sample output - yours may be different.
4

ping -c 1 google.com | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

BruceLEET · 2010-10-26 01:11:01 7
List only the directories

This command would be useful when it is desirable to list only the directories. 'egrep' chooses only the lines that begin with 'd'. Show Sample Output
This is sample output - yours may be different.
```
$ ls -l 
drwxrwx--- 2 sim sim 4096 2009-02-08 14:19 adir
-rwxrwx--- 1 sim sim   52 2009-02-05 13:11 a.sh
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 x.txt
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 y.txt
-rw-rw---- 1 sim sim    0 2009-02-05 13:09 z.txt

$ ls -l | egrep ^d
drwxrwx--- 2 sim sim 4096 2009-02-08 14:19 adir
```
3

ls -l | egrep ^d

ergut · 2009-02-08 22:21:55 13
diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.

diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.
This is sample output - yours may be different.
3

diff <(cd /path-1; find . -type f -print | egrep -i '\.m4a$|\.mp3$') <(cd /path-2; find . f -print | egrep -i '\.m4a$|\.mp3$')

drewk · 2009-08-17 00:49:31 6
last.fm rss parser

Quick and kludgy rss parser for the recent tracks rss feed from last.fm. Extracts artist and track link. Show Sample Output
This is sample output - yours may be different.
```
<li><a href="http://www.last.fm/music/Morton+Feldman/_/Something+Wild">          Morton Feldman ? Something Wild</a></li>
<li><a href="http://www.last.fm/music/Christopher+Bissonnette/_/Pellucidity">          Christopher Bissonnette ? Pellucidity</a></li>
```
3

egrep "<link>|<title>" recenttracks.rss | awk 'ORS=NR%2?" ":"\n"' | awk -F "</title>" '{print $2, $1}' | sed -e 's/\<link\>/\<li\>\<a href\=\"/' -e 's/\<\/link\>/\">/' -e 's/\<title\>//' -e 's/$/\<\/a\>\<\/li\>/g' -e '1,1d' -e 's/^[ \t]*//'

HerbT · 2009-11-28 13:19:05 14
Speed up upgrades for a debian/ubuntu based system.

Please install aria2c before you try the above command. On ubuntu the command to install aria2c would be: sudo aptitude install aria2
This is sample output - yours may be different.
3

sudo aptitude update; sudo apt-get -y --print-uris upgrade | egrep -o -e "http://[^\']+" | sudo aria2c -c -d /var/cache/apt/archives -i -; sudo aptitude -y safe-upgrade

freethinker · 2010-02-18 16:02:29 6
Extract raw URLs from a file

you can also use cut instead of awk. less powerful but probably faster. ;)
This is sample output - yours may be different.
3

egrep -ie "<*HREF=(.*?)>" index.html | cut -d "\"" -f 2 | grep ://

fanfani · 2011-03-29 18:20:50 4
Get OSX Battery percentage

adjusting the field "f1" will give you additional information such as f1 = 98% f2 = discharging f3 = 2:02 remaining Show Sample Output
This is sample output - yours may be different.
```
98% #Get OSX Battery percentage
```
3

pmset -g batt | egrep "([0-9]+\%).*" -o --colour=auto | cut -f1 -d';'

deshawnbw · 2012-03-23 23:23:46 6
Get My Public IP Address
This is sample output - yours may be different.
2

wget -qO - http://myip.dk/ | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

6peng · 2009-02-06 03:25:08 20
List all the files that have been deleted while they were still open.

If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.
This is sample output - yours may be different.
2

lsof | egrep "^COMMAND|deleted"

jyoder · 2009-03-12 23:11:26 5
Get the current svn branch/tag (Good for PS1/PROMPT_COMMAND cases)

Get the svn info, grep for the "URL" of the repository, pull out the tag/branch/trunk, and then just show the helpful/meaningful bit. Show Sample Output
This is sample output - yours may be different.
```
trunk
```
2

svn info | grep '^URL:' | egrep -o '(tags|branches)/[^/]+|trunk' | egrep -o '[^/]+$'

isaacs · 2009-04-09 20:08:45 5
Solaris - check ports/sockets which process has opened
This is sample output - yours may be different.
2

/usr/proc/bin/pfiles $PID | egrep "sockname|port"

sengork · 2009-07-04 08:26:54 9
Get Futurama quotations from slashdot.org servers
This is sample output - yours may be different.
2

lynx -head -dump http://slashdot.org|egrep 'Bender|Fry'|sed 's/X-//'

linuxrawkstar · 2009-07-30 19:53:16 3
Short Information about loaded kernel modules

Run this as root, it will be helpful to quickly get information about the loaded kernel modules. Show Sample Output
This is sample output - yours may be different.
```
# lsmod | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'
filename:       /lib/modules/2.6.26-2-amd64/kernel/drivers/net/usb/cdc_ether.ko
description:    USB CDC Ethernet devices
depends:        usbnet

filename:       /lib/modules/2.6.26-2-amd64/kernel/drivers/net/usb/usbnet.ko
description:    USB network driver framework
depends:        mii
```
2

lsmod | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'

mohan43u · 2009-11-17 02:13:34 3
Find the fastest server to disable comcast's DNS hijacking

Comcast is an ISP in the United States that has started hijacking DNS requests as a "service" for its customers. For example, in Firefox, one used to be able to do a quick "I'm Feeling Lucky" Google search by typing a single word into the URL field, assuming the word is not an existing domain when surrounded by www.*.com. Comcast customers never receive the correct NX (non-existent domain) error from DNS. Instead, they are shown a page full of advertising. There is a way to "opt out" from their service, but that requires having the account password and the MAC address of your modem handy. For me, it was easier just to set static DNS servers. But the problem is, which ones to choose? That's what this command answers. It'll show you the three _non-hijacked_ Comcast DNS servers that are the shortest distance away. Perhaps you don't have Comcast (lucky you!), but hopefully this command can serve as an example of using netselect to find the fastest server from a list. Note that, although this example doesn't show it, netselect will actually perform the uniq and DNS resolution for you. Requires: netselect, curl, sort, uniq, grep Show Sample Output
This is sample output - yours may be different.
```
Running netselect to choose 3 out of 12 addresses.      
...........................................................................
   53 68.87.69.146
   62 68.87.76.178
  273 68.87.74.162
```
2

sudo netselect -v -s3 $(curl -s http://dns.comcast.net/dns-ip-addresses2.php | egrep -o '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' | sort | uniq)

hackerb9 · 2010-01-27 00:03:44 5
Get Unique Hostnames from Apache Config Files

Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server. A slightly shorter version.
This is sample output - yours may be different.
2

cat /etc/apache2/sites-enabled/* | egrep 'ServerAlias|ServerName' | tr -s ' ' | sed 's/^\s//' | cut -d ' ' -f 2 | sed 's/www.//' | sort | uniq

chronosMark · 2010-04-08 15:50:34 2
Get each users commit amount
This is sample output - yours may be different.
2

svn log 2>&1 | egrep '^r[0-9]+' | cut -d "|" -f2 | sort | uniq -c

cicatriz · 2010-09-06 15:13:48 4
resolve short urls

since the most url shorteners respond with a header containing the Location: ... this works with most common shorteners Show Sample Output
This is sample output - yours may be different.
```
resolve http://goo.gl/gy8n
-> http://www.commandlinefu.com/commands/browse
```
2

resolve(){ curl -Is $1 | egrep "Location" | sed "s/Location: $.*$/\1/g"; }

hoodie · 2011-12-06 12:37:46 20
Prints a file leaving out all blank lines and comment-only lines

Does not print any line that either: - is empty - contains only spaces or tabs - starts with # - starts with spaces/tabs followed by a #
This is sample output - yours may be different.
2

egrep -v "^\s*(#|$)" myfile.cfg

dan · 2011-12-08 15:25:17 70
Show sections of a man page.

Uses the formatting of a man page to show an outline of its headers and sub-headers. Show Sample Output
This is sample output - yours may be different.
```
LS(1)
NAME
SYNOPSIS
DESCRIPTION
   Exit status:
AUTHOR
REPORTING BUGS
COPYRIGHT
SEE ALSO
GNU coreutils 7.4 
```
2

man ls | egrep "^([A-Z]| [A-Z])"

bartonski · 2013-01-09 17:12:03 5
Shows size of dirs and files, hidden or not, sorted.
This is sample output - yours may be different.
2

du --max-depth=1 -h * |sort -n -k 1 |egrep 'M|G'

leonteale · 2013-02-07 18:52:29 4
Extract HTTP Passwords in POST Requests
This is sample output - yours may be different.
2

sudo tcpdump -s 0 -A -n -l | egrep -i "POST /|pwd=|passwd=|password=|Host:"

wuseman1 · 2019-02-03 05:15:28 901
edit, view or execute last modified file with a single key-press

Copy this function to command line, press 'Enter' 'f'' 'Enter' to execute (sentence on the left written only for newbies). Hint 'e|x|v|1..9' in front of displayed last modified file name means: "Press 'e' for edit,'x' for execute,'v' for view or a digit-key '1..9' to touch one file from the recent files list to be last modified" and suggested (hidden files are listed too, else remove 'a' from 'ls -tarp' statement if not intended). If you find this function useful you can then rename it if needed and append or include into your ~/.bashrc config script. With the command . ~/.bashrc the function then can be made immediately available. In the body of the function modifications can be made, i.e. replaced joe editor command or added new option into case statement, for example 'o) exo-open $h;;' command for opening file with default application - or something else (here could not be added since the function would exceed 255 chars). To cancel execution of function started is no need to press Ctrl-C - if the mind changed and want to leave simple Enter-press is enough. Once defined, this function can with typeset -f f command be displayed in easy readable form Show Sample Output
This is sample output - yours may be different.
```
knoppix5@kanta:~/SKRIPTE$ f
...
1       rdiff_backup_to_sda3.txt
2       arrange_windows_simple_from_xfce_panel.txt
3       .config.sh
4       arrange_windows.txt
5       read1.sh
6       read3.sh
7       lsb.sh
8       board9.pgn
9       read4.sh
e|x|v|1..9 read4.sh?
```
2

f() { ls -lart;e="ls -tarp|grep -v /|tail -9";j=${e/9/1};g=${e/9/9|nl -nln};h=$(eval $j);eval $g;read -p "e|x|v|1..9 $(eval $j)?" -n 1 -r;case $REPLY in e) joe $h;;v)cat $h;;x) eval $h;;[1-9]) s=$(eval $g|egrep ^$REPLY) && touch "${s:7}" && f;;esac ; }

knoppix5 · 2019-09-26 11:58:37 249
Validate openssh key & print checksum
This is sample output - yours may be different.
1

ssh-keygen -l -f [pubkey] | awk '{print $2}' | tr -ds ':' '' | egrep -ie "[a-f0-9]{32}"

wwest4 · 2009-02-05 17:42:30 16
Get My Public IP Address
This is sample output - yours may be different.
1

curl -s http://myip.dk/ | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'

6peng · 2009-02-06 03:23:39 33
< 1 2 3 4 > Last ›

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Create a tar file with the current date in the name.

Same, but count of signs is little less :) .

Move all images in a directory into a directory hierarchy based on year, month and day based on exif information

This command would move the file "dir/image.jpg" with a "DateTimeOriginal" of "2005:10:12 16:05:56" to "2005/10/12/image.jpg". This is a literal example from the exiftool man page, very useful for classifying photo's. The possibilities are endless.

Take a screenshot of the window the user clicks on and name the file the same as the window title

In general, this is actually not better than the "scrot -d4" command I'm listing it as an alternative to, so please don't vote it down for that. I'm adding this command because xwd (X window dumper) comes with X11, so it is already installed on your machine, whereas scrot probably is not. I've found xwd handy on boxen that I don't want to (or am not allowed to) install packages on. NOTE: The dd junk for renaming the file is completely optional. I just did that for fun and because it's interesting that xwd embeds the window title in its metadata. I probably should have just parsed the output from file(1) instead of cutting it out with dd(1), but this was more fun and less error prone. NOTE2: Many programs don't know what to do with an xwd format image file. You can convert it to something normal using NetPBM's xwdtopnm(1) or ImageMagick's convert(1). For example, this would work: "xwd | convert fd:0 foo.jpg". Of course, if you have ImageMagick already installed, you'd probably use import(1) instead of xwd. NOTE3: Xwd files can be viewed using the X Window UnDumper: "xwud <foo.xwd". ImageMagick and The GIMP can also read .xwd files. Strangely, eog(1) cannot. NOTE4: The sleep is not strictly necessary, I put it in there so that one has time to raise the window above any others before clicking on it.

Show your local ipv4 IP

To show ipv6 instead, use [[ -6 ]] instead of [[ -4 ]] $ip -o -6 a s | awk -F'[ /]+' '$2!~/lo/{print $4}' To show only the IP of a specific interface, in case you get more than one result: $ip -o -4 a s eth0 | awk -F'[ /]+' '$2!~/lo/{print $4}' $ip -o -4 a s wlan0 | awk -F'[ /]+' '$2!~/lo/{print $4}'

Disconnect telnet

You are stuck with testing a tcp port using telnet, and must kill the telnet session from another terminal... Or, press ctrl+5 and write close/quit to force the current connection to close..

lotto generator

note the xargs at the end

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" }

continuously print string as if being entered from the keyboard

Cycles continuously through a string printing each character with a random delay less than 1 second. First parameter is min, 2nd is max. Example: 1 3 means sleep random .1 to .3. Experiment with different values. The 3rd parameter is the string. The sleep will help with battery life/power consumption. $ cycle 1 3 $(openssl rand 100 | xxd -p) Fans of "The Shining" might get a kick out of this: $ cycle 1 4 ' All work and no play makes Jack a dull boy.'

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"

Redirect a filehandle from a currently running process.

This command uses the debugger to attach to a running process, and reassign a filehandle to a file. The two commands executed in gdb are p close(1) which closes STDOUT and p creat("/tmp/filename",0600) which creates a file and opens it for output. Since file handles are assigned sequentially, this command opens the file in place of STDOUT and once the process continues, new output to STDOUT will instead be written to our capture file.

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Commands using egrep (220)

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