Commands tagged grep sorted by votes

Commands tagged grep (409)

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List the CPU model name

Extracts the model name of the CPU and displays it on screen. Show Sample Output
This is sample output - yours may be different.
```
model name	: Genuine Intel(R) CPU           T2080  @ 1.73GHz
model name	: Genuine Intel(R) CPU           T2080  @ 1.73GHz
```
3

grep "model name" /proc/cpuinfo

getkaizer · 2009-11-05 05:23:30 4
Get all mac address

Get mac address listed for all interfaces. Show Sample Output
This is sample output - yours may be different.
```
$ ifconfig -a| grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'
00:25:4b:a2:45:72
00:25:4b:89:98:a0
00:25:4b:ff:fe:a2
0a:00:27:00:00:00
```
3

ifconfig -a| grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}'

evenme · 2010-02-27 14:30:43 6
easily find megabyte eating files or directories

This is easy to type if you are looking for a few (hundred) "missing" megabytes (and don't mind the occasional K slipping in)... A variation without false positives and also finding gigabytes (but - depending on your keyboard setup - more painful to type): du -hs *|grep -P '^(\d|,)+(M|G)'|sort -n (NOTE: you might want to replace the ',' according to your locale!) Don't forget that you can modify the globbing as needed! (e.g. '.[^\.]* *' to include hidden files and directories (w/ bash)) in its core similar to: http://www.commandlinefu.com/commands/view/706/show-sorted-list-of-files-with-sizes-more-than-1mb-in-the-current-dir Show Sample Output
This is sample output - yours may be different.
```
1,1M	htdig
1,1M	xml
1,2M	empathy
....
52M	man
55M	locale
72M	gtk-doc
94M	apps
258M	icons
316K	ImageMagick-6.5.0
366M	doc
```
3

du -hs *|grep M|sort -n

tuxlifan · 2010-03-25 19:20:24 4

Find all files currently open in Vim and/or gVim

Catches .swp, .swo, .swn, etc. If you have access to lsof, it'll give you more compressed output and show you the associated terminals (e.g., pts/5, which you could then use 'w' to figure out where it's originating from): lsof | grep '\.sw.$' If you have swp files turned off, you can do something like: ps x | grep '[g,v]im', but it won't tell you about files open in buffers, via :e [file]. Show Sample Output

vim -r 2>&1 | grep '\.sw.' -A 5 | grep 'still running' -B 5

rkulla · 2010-04-17 19:43:35 4

grep for tabs without using Ctrl-V trick

-P tells grep to use perl regex matches (only works on the GNU grep as far as I know.)
This is sample output - yours may be different.
3

grep -P '\t' filename

SuperJediWombat · 2010-05-02 02:24:14 3
Use Perl like grep

If you've ever tried "grep -P" you know how terrible it is. Even the man page describes it as "highly experimental". This function will let you 'grep' pipes and files using Perl syntax for regular expressions. The first argument is the pattern, e.g. '/foo/'. The second argument is a filename (optional). Show Sample Output
This is sample output - yours may be different.
```
% printf "some\nfake\ntext\n" | prep '/^\s?[Ff]ake\s?$/'
fake
 
% printf "some\nfake\ntext\n" > file.txt

% prep '/^\s?[Ff]ake\s?$/' file.txt
fake
```
3

prep () { perl -nle 'print if '"$1"';' $2 }

dbbolton · 2011-08-13 14:29:26 6
Fastest Sort. Sort Faster, Max Speed

sort is way slow by default. This tells sort to use a buffer equal to half of the available free memory. It also will use multiple process for the sort equal to the number of cpus on your machine (if greater than 1). For me, it is magnitudes faster. If you put this in your bash_profile or startup file, it will be set correctly when bash is started. sort -S1 --parallel=2 <(echo) &>/dev/null && alias sortfast='sort -S$(($(sed '\''/MemF/!d;s/[^0-9]*//g'\'' /proc/meminfo)/2048)) $([ `nproc` -gt 1 ]&&echo -n --parallel=`nproc`)' Alternative echo|sort -S10M --parallel=2 &>/dev/null && alias sortfast="command sort -S$(($(sed '/MemT/!d;s/[^0-9]*//g' /proc/meminfo)/1024-200)) --parallel=$(($(command grep -c ^proc /proc/cpuinfo)*2))" Show Sample Output
This is sample output - yours may be different.
```
89/490MB        4.22 2.03 1.01 2/85 7081
[24309:24308 0:4220] 08:01:28 Mon Feb 27 [root@galileo:pts/2 +1] ~
$ sort -S400M -u -i -f --parallel=4 files.nocombined.sorted | pv > ~/files.nocombined.reallysorted                                                                                                                                                                                                                              
9.95MB 0:01:39 [ 103kB/s] [     <=>             
```
3

alias sortfast='sort -S$(($(sed '\''/MemF/!d;s/[^0-9]*//g'\'' /proc/meminfo)/2048)) $([ `nproc` -gt 1 ]&&echo -n --parallel=`nproc`)'

AskApache · 2012-02-28 01:34:58 6
Remove all unused kernels with apt-get

Remove old kernels (*-generic and *-generic-pae) via apt-get on debian/ubuntu based systems. Tested on ubuntu 10.04 - 12.04.
This is sample output - yours may be different.
3

sudo apt-get remove $(dpkg -l|awk '/^ii linux-image-/{print $2}'|sed 's/linux-image-//'|awk -v v=`uname -r` 'v>$0'|sed 's/-generic*//'|awk '{printf("linux-headers-%s\nlinux-headers-%s-generic*\nlinux-image-%s-generic*\n",$0,$0,$0)}')

mtron · 2012-08-15 10:02:12 6
Write a shell script that removes files that contain a string

Deletes files in the current directory or its subdirectories that match "regexp" but handle directories, newlines, spaces, and other funky characters better than the original #13315. Also uses grep's "-q" to be quiet and quit at the first match, making this much faster. No need for awk either.
This is sample output - yours may be different.
3

find -type f -exec grep -q "regexp" {} \; -delete

gumnos · 2014-04-06 19:06:50 9
Show most common words in filenames

I'm sure there's a more elegant sed version for the tr + grep section.
This is sample output - yours may be different.
3

ls | tr '[[:punct:][:space:]]' '\n' | grep -v "^\s*$" | sort | uniq -c | sort -bn

qdrizh · 2014-10-14 09:52:28 9
easily strace all your apache processes

Will open strace on all apache process, on systems using sbin/apache (debian) or sbin/httpd (redhat), and will follow threads newly created.
This is sample output - yours may be different.
3

ps auxw | grep -E 'sbin/(apache|httpd)' | awk '{print"-p " $2}' | xargs strace -F

gormux · 2016-08-04 10:59:58 14
Backup all starred repositories from Github
This is sample output - yours may be different.
3

GITUSER=$(whoami); curl "https://api.github.com/users/${GITUSER}/starred?per_page=1000" | grep -o 'git@[^"]*' | xargs -L1 git clone

wuseman1 · 2022-06-25 20:39:12 398
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
fetch all revisions of a specific file in an SVN repository

exported files will get a .r23 extension (where 23 is the revision number)
This is sample output - yours may be different.
2

svn log fileName|cut -d" " -f 1|grep -e "^r[0-9]\{1,\}$"|awk {'sub(/^r/,"",$1);print "svn cat fileName@"$1" > /tmp/fileName.r"$1'}|sh

fizz · 2009-05-27 02:11:58 8
Lists unambigously names of all xml elements used in files in current directory

This set of commands was very convenient for me when I was preparing some xml files for typesetting a book. I wanted to check what styles I had to prepare but coudn't remember all tags that I used. This one saved me from error-prone browsing of all my files. It should be also useful if one tries to process xml files with xsl, when using own xml application.
This is sample output - yours may be different.
2

grep -h -o '<[^/!?][^ >]*' * | sort -u | cut -c2-

thebodzio · 2009-06-17 00:22:18 10
Search through files, ignoring .svn
This is sample output - yours may be different.
2

grep <pattern> -R . --exclude-dir='.svn'

log0 · 2009-07-13 19:08:53 6

Track X Window events in chosen window

After executing this, click on a window you want to track X Window events in. Explaination: "xev will track events in the window with the following -id, which we get by greping window information obtained by xwininfo" Show Sample Output

xev -id `xwininfo | grep 'Window id' | awk '{print $4}'`

ktoso · 2009-09-19 22:47:16 6

Grab an interface's IP from ifconfig without screen clutter

Sometimes, you don't really care about all the other information that ifconfig spits at you (however useful it may otherwise be). You just want an IP. This strips out all the crap and gives you exactly what you want. Show Sample Output
This is sample output - yours may be different.
```
eth1: 192.168.100.73
```
2

ifconfig eth1 | grep inet\ addr | awk '{print $2}' | cut -d: -f2 | sed s/^/eth1:\ /g

BoxingOctopus · 2009-11-03 19:26:40 10
Find all files containing a word

shorter :p Show Sample Output
This is sample output - yours may be different.
```
user@host:~/$ grep -rHi info *.php
noclick.php:for your info
noclick.php:or information
noclick.php:both match info
```
2

grep -rHi searchphrase *.php

psybermonkey · 2010-01-15 00:23:25 5
display a one-liner of current nagios exit statuses. great with netcat/irccat
This is sample output - yours may be different.
2

grep current_state= /var/log/nagios/status.dat|sort|uniq -c|sed -e "s/[\t ]*$[0-9]*$.*current_state=$[0-9]*$/\2:\1/"|tr "\n" " "

c3w · 2010-03-11 06:04:14 3
Working random fact generator

extension to tali713's random fact generator. It takes the output & sends it to notify-osd. Display time is proportional to the lengh of the fact.
This is sample output - yours may be different.
2

wget randomfunfacts.com -O - 2>/dev/null | grep \<strong\> | sed "s;^.*<i>$.*$</i>.*$;\1;" | while read FUNFACT; do notify-send -t $((1000+300*`echo -n $FUNFACT | wc -w`)) -i gtk-dialog-info "RandomFunFact" "$FUNFACT"; done

mtron · 2010-04-02 09:43:32 4
Report full partitions from a cron

Reports all local partitions having more than 90% usage. Just add it in a crontab and you'll get a mail when a disk is full. (sending mail to the root user must work for that) Show Sample Output
This is sample output - yours may be different.
```
/dev/sda2            151913824 136594552   7602452  95% /
```
2

df -l | grep -e "9.%" -e "100%"

dooblem · 2010-04-26 17:57:54 3
Extract IPv4 addressess from file

Show Sample Output
This is sample output - yours may be different.
```
83.233.165.56
92.123.73.25
92.123.73.57
92.123.73.8
95.100.117.11
```
2

grep -Eo $[0-9]\{1,3\}[\.]$\{3\}[0-9] file | sort | uniq

rubenmoran · 2010-05-23 11:23:57 4
concatenate compressed and uncompressed logs

I use zgrep because it also parses non gzip files. With ls -tr, we parse logs in time order. Greping the empty string just concatenates all logs, but you can also grep an IP, an URL...
This is sample output - yours may be different.
2

zgrep -h "" `ls -tr access.log*`

dooblem · 2010-06-19 09:44:05 4
Echo the latest commands from commandlinefu on the console

A Quick variation to the latest commands list with the new-lines skipped. This is faster to read.
This is sample output - yours may be different.
2

wget -O - http://www.commandlinefu.com/commands/browse/rss 2>/dev/null | awk '/\s*<title/ {z=match($0, /CDATA\[([^\]]*)\]/, b);print b[1]} /\s*<description/ {c=match($0, /code>(.*)<\/code>/, d);print d[1]} ' | grep -v "^$"

nikunj · 2010-06-29 16:22:03 36
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Get all files of particular type (say, PDF) listed on some wegpage (say, example.com)

See man wget if you want linked files and not only those hosted on the website.

Get the total length of time in hours:minutes:seconds (HH:MM:SS) of all video (or audio) in the current dir (and below)

change the *.avi to whatever you want to match, you can remove it altogether if you want to check all files.

Remove the first character of each line in a file

change ownership en masse of files owned by a specific user, including files and directories with spaces

In the example, uid 0 is root. foo:foo are the user:group you want to make owner and group. '.' is the "current directory and below." -print0 and -0 indicate that filenames and directories "are terminated by a null character instead of by whitespace."

Rename files in batch

Cryptographically secure 32-bit RNG in strict ZSH

ZSH ships a couple random number generators via the $RANDOM environment variable and rand48() via zsh/mathfunc, but neither are cryptographically secure. This code produces a 32-bit random number suitable for cryptography. It's only dependency is /dev/urandom and it does not rely on any shell commands or 3rd party utilities. It assumes ZSH was compiled with 64-bit integer support.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Set Time Zone in Ubuntu

Reconfigures time zone in Ubuntu, which I cannot figure out how to do through the GUI. Worked like a charm to set my time zone to CEST from EDT.

Hardlink all identical files in the current directory (regain some disk space)

Meaning of switches (see man page too): v verbose p ignore mode (permissions) o ignore owner, group t ignore time of modification Disadvantage: If you modify any linked file, this will propagate to all other files which occupy the same space.

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"

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Commands tagged grep (409)

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