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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modify a file in place with perl

changes THIS to THAT in all files matching fileglob* without using secondary files

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Clean swap area after using a memory hogging application

When you run a memory intensive application (VirtualBox, large java application, etc) swap area is used as soon as memory becomes insufficient. After you close the program, the data in swap is not put back on memory and that decreases the responsiveness. Swapoff disables the swap area and forces system to put swap data be placed in memory. Since running without a swap area might be detrimental, swapon should be used to activate swap again. Both swapoff and swapon require root privileges.

Find the package that installed a command

Re-read partition table on specified device without rebooting system (here /dev/sda).

Cleanup firefox's database.

Sqlite database keeps collecting cruft as time passes, which can be cleaned by the 'vacuum;' command. This command cleans up the cruft in all sqlite files relating to the user you have logged in as. This command has to be run when firefox is not running, or it will exit displaying the pid of the firefox running.

Print trending topics on Twitter

Get a range of SVN revisions from svn diff and tar gz them

Handy when you need to create a list of files to be updated when subversion is not available on the remote host. You can take this tar file, and upload and extract it where you need it. Replace M and N with the revisions specific to yours. Make sure you do this from an updated (svn up) working 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 a,b,c to ('a','b','c') for use in SQL in-clauses

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Commands using egrep (220)

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