Commands using grep sorted by votes

Commands using grep (1,935)

sorted by

Verify a file has not been tampered with since dpkg installation

Replace "user/sbin/sshd" with the file you would like to check. If you are doing this due to intrusion, you obviously would want to check size, last modification date and md5 of the md5sum application itself. Also, note that "/var/lib/dpkg/info/*.md5sums" files might have been tampered with themselves. Neither to say, this is a useful command. Show Sample Output
This is sample output - yours may be different.
```
/usr/sbin/sshd: OK
```
0

cat /var/lib/dpkg/info/*.md5sums|grep usr/sbin/sshd|sed 's,usr,/usr,'|md5sum -c

Ztyx · 2013-03-12 11:20:48 7
Ensure path permissions from '.' prior to root

`pwd` returns the current path `grep -o` prints each slash on new line perl generates the paths sequence: './.', './../.', ... `readlink` canonicalizes paths (it makes the things more transparent) `xargs -tn1` applies chmod for each of them. Each command applied is getting printed to STDERR. Show Sample Output
This is sample output - yours may be different.
```
chmod 755 /tmp/1/2/3 
chmod 755 /tmp/1/2 
chmod 755 /tmp/1 
chmod 755 /tmp 
```
0

pwd|grep -o '/'|perl -ne '$x.="./.";print`readlink -f $x`'|xargs -tn1 chmod 755

luke_skywalker · 2013-03-14 12:03:44 7
Add ofxAddons mentioned in source files, into addons.make

ofxGui ofxFX
This is sample output - yours may be different.
0

grep -hor ofx[a-zA-Z]*.h src/ | grep -o ofx[^\.]* >> addons.make

egeoffray · 2013-03-15 11:29:50 6
Go get those photos from a Picasa album (full size)
This is sample output - yours may be different.
0

wget -O - "[PICASA ALBUM RSS LINK]" |sed 's/</\n</g' | grep media:content |sed 's/.*url='"'"'$[^'"'"']*$'"'"'.*$/\1/' |awk -F'/' '{gsub($NF,"d/"$NF); print $0}'|wget -i -

mxac · 2013-03-16 15:48:41 4
Extract all IPs from a file
This is sample output - yours may be different.
0

grep -E '([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})' -o tmp

opexxx · 2013-03-18 14:12:22 5
identify active network connections
This is sample output - yours may be different.
0

lsof -i -P +c 0 +M | grep -i "$1"

opexxx · 2013-03-19 10:42:15 4
Twitter Account Validator

Reason can be: taken, available, contains_banned_word
This is sample output - yours may be different.
0

if wget https://twitter.com/users/username_available?username=xmuda -q -O - | grep -q "\"reason\":\"taken\""; then echo "Username taken"; else echo "Free / Banned Name"; fi

Joschasa · 2013-03-23 17:39:15 4
calculate how many different lines between two files

calculate how many different lines between two files Show Sample Output
This is sample output - yours may be different.
```
jin@hellojinjie /cygdrive/d/tmp
$ grep -Fvxf va vb | wc -l
134
```
0

grep -Fvxf $(file1) $(file2) | wc -l

hellojinjie · 2013-03-27 05:25:15 4
Check if a file is text

This command produces no output, but its exit status is 0 ("true") if $file is text, non-0 ("false") if $file is binary (or is not accessible). Explanation: -q suppresses all the output of grep -I is the trick: if a binary file is found, it is considered a non-match -m 1: limit "output" to first match (speed up for big files) .: the match string, "." stands for any character Usage: e.g. run editor only on text files grep -qIm 1 . $file && vi $file
This is sample output - yours may be different.
0

grep -qIm1 . $file

anon1251 · 2013-03-28 14:11:51 3
Get the number of open sockets for a process
This is sample output - yours may be different.
0

ps aux | grep [process] | awk '{print $2}' | xargs -I % ls /proc/%/fd | wc -l

auser · 2013-04-03 09:40:03 7
find potentially malicious PHP commands used in backdoors and aliked scripts

Searched strings: passthru, shell_exec, system, phpinfo, base64_decode, chmod, mkdir, fopen, fclose, readfile Since some of the strings may occur in normal text or legitimately you will need to adjust the command or the entire regex to suit your needs.
This is sample output - yours may be different.
0

find ./public_html/ -name \*.php -exec grep -HRnDskip "$passthru\|shell_exec\|system\|phpinfo\|base64_decode\|chmod\|mkdir\|fopen\|fclose\|readfile$ *(" {} \;

lpanebr · 2013-04-03 12:42:19 8
Graphically display directory structure

A way to display directory structure Show Sample Output
This is sample output - yours may be different.
```
   |-Albumn
   |---config
   |---src
   |-----Albumn
   |-------Controller
   |-------Form
   |-------Model
   |---view
   |-----album
   |-------album
```
0

ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'

checarsner · 2013-04-04 05:08:54 6
grep 2 words existing on the same line
This is sample output - yours may be different.
0

grep -E/egrep 'word1.*word2|word2.*word1' "$@"

glancesx · 2013-04-06 04:07:30 5
Easily find an old command you run

this also can find the old command you used before
This is sample output - yours may be different.
0

history | tail -100 | grep cmd

datamining · 2013-04-22 03:49:43 9
find top 20 results in apache statistics for a specific month
This is sample output - yours may be different.
0

awk '/Dec\/2012/ {print $1,$8}' logfile | grep -ivE '(.gif|.jpg|.png|favicon|.css|.js|robots.txt|wp-l|wp-term)' | sort | uniq -c | sort -rn | head -n 20

vaaclav · 2013-04-30 06:51:47 6
find ip address in all files in /etc directory

find ip address in all files in /etc directory. can be used to find any string in any directory really
This is sample output - yours may be different.
0

find /etc -type f -print0 | xargs -r0 grep --color '192.168.0.1'

jakezp · 2013-04-30 15:03:20 9
grep for 2 (or more) words anywhere on each line of a file

If you know any two (or more) words are occurring on multiple lines in a file, using a regular expression such as this will help you find them quickly.
This is sample output - yours may be different.
0

grep -E "(.*)(ERROR)(.*)(FAULT)(.*)" log.txt

pioniere · 2013-05-01 15:45:52 6
Chrome sucks
This is sample output - yours may be different.
0

ps -A -o rss,command | grep [C]hrome | awk '{sum+=$1} END {printf("%sMB\n",sum/1024)}'

seanubis · 2013-05-08 13:30:59 5
Produces a list of when your domains expire
This is sample output - yours may be different.
0

cat domainlist.txt | while read line; do echo -ne $line; whois $line | grep Expiration ; done | sed 's:Expiration Date::'

jun3337 · 2013-05-13 02:55:17 8
Fetches a Reddit user's ($USER) link karma

Replace $USER with the username of the Reddit user in question. To get comment karma instead run... curl -s http://www.reddit.com/user/$USER/about.json | tr "," "\n" | grep "comment_karma" | tr ": " "\n" | grep -E "[0-9]+" | sed s/"^"/"Comment Karma: "/ Show Sample Output
This is sample output - yours may be different.
```
Link Karma: 1337
```
0

curl -s http://www.reddit.com/user/$USER/about.json | tr "," "\n" | grep "link_karma" | tr ": " "\n" | grep -E "[0-9]+" | sed s/"^"/"Link Karma: "/

iiAtlas · 2013-05-13 15:36:59 11
how much time restart the wls service?
This is sample output - yours may be different.
0

more restart_weblogic.log | grep "LISTEN" | awk '{ print $7 }' | uniq | wc -l

cuizhaohua · 2013-05-16 08:40:57 6
Get the current svn branch/tag (Good for PS1/PROMPT_COMMAND cases)
This is sample output - yours may be different.
0

svn info | grep ^URL | awk -F\/ '{print $NF}'

mplf · 2013-05-18 15:34:09 7
Check for listening services
This is sample output - yours may be different.
0

netstat -tuapen | grep LISTEN

mered · 2013-05-18 20:40:38 158
Search Objective-C source file for tag listing and sort

I use this one-liner to search my sourcecode to find out where tags are named and since there's no easy way in XCode to see what values have already been used. Show Sample Output
This is sample output - yours may be different.
```
1
2
3
4
5
6
7
8
```
0

grep '.tag =' <file> | awk '{print $3}' | awk 'sub(/[;]/, x)' | sort -n

pbriggeman · 2013-05-21 15:58:16 6
grep all pdf files in a folder

This command is useful for searching through a whole folder worth of pdf files. Show Sample Output
This is sample output - yours may be different.
```
--------Lecture_VIII_LinkLayer.pdf-------

forwarding frame before CRC is checked (at end of frame)
--------Lecture_VII_IP.pdf-------

--------Lecture_VI_NetworkLayer.pdf-------
```
0

for i in *.pdf; do echo --------$i-------; echo; pdftotext $i - | grep -i Yourpattern; done

fangfufu · 2013-05-22 05:36:06 12
‹ First < 46 47 48 49 50 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

search for text in files. recursive.

recursively search dir for a a particular file type, search each file for a particular text.

Rename files in batch

Get windows IPv4 and nothing else

May be useful to get user's ip address over the phone, as users struggle to read through a long ipconfig result.

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"

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).

Take screenshot through SSH

Of course it requires import command, from imagemagick tools, but it's simpler to type, and imagemagick is usefull anyway.

add static arp entry to default gateway, arp poison protection

Unite pdf files

pdfunite is a part of the poppler-utils. poppler-utils package is only 150KB. The alternative - pdftk package is 14MB! Install poppler-utils if you need simple pdf operation commands like unite, separate, info, text/html conversions

save stderr only to a file

taken from http://www.unix.com/shell-programming-scripting/158311-how-tee-stderr.html " What does it mean? The redirection operator n>&m makes file descriptor n to be a copy of file descriptor m. So, whe are: - Opening a new file descriptor, 3, that is a copy of file descriptor 1, the standard output; - Making file descriptor 1 a copy of file descriptor 2, the standard error output; - Making file descriptor 2 to be a copy of file descriptor 3 (the "backup" of the standard output) in a short: we swapped the standard output and the standard error output. "

Shows picture exif GPS info if any and converts coords to a decimal degree number

This oneliner uses Imagemagic's identify utility to show the exif GPS information of an image an also converts Grad/MIn/Sec representation to a decimal degree number

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using grep

Commands using grep (1,935) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using grep (1,935)

sorted by