Commands using egrep sorted by votes

Commands using egrep (220)

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Filter out all blank or commented (starting with #) lines
This is sample output - yours may be different.
1

egrep -v "(^#|^\b*$)"

FiloSottile · 2013-03-28 11:20:46 10
Prints total line count contribution per user for an SVN repository

make usable on OSX with filenames containing spaces. note: will still break if filenames contain newlines... possible, but who does that?!
This is sample output - yours may be different.
1

svn ls -R | egrep -v -e "\/$" | tr '\n' '\0' | xargs -0 svn blame | awk '{print $2}' | sort | uniq -c | sort -nr

rymo · 2013-04-10 19:37:53 5
Remove git branches that do not have a remote tracking branch anymore
This is sample output - yours may be different.
1

git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -d

Schleis · 2013-06-10 17:56:20 9
Backup all MySQL Databases to individual files

Backs up all databases, excluding test, mysql, performance_schema, information_schema. Requires parallel to work, install parallel on Ubuntu by running: sudo aptitude install parallel
This is sample output - yours may be different.
1

mysql -e 'show databases' -s --skip-column-names | egrep -v "^(test|mysql|performance_schema|information_schema)$" | parallel --gnu "mysqldump --routines {} > {}_daily.sql"

intel352 · 2013-07-24 15:37:58 11
Find all Mac Address

Is the better option on a Open SuSE Box
This is sample output - yours may be different.
1

ifconfig | egrep [0-9A-Za-z]{2}$:[0-9A-Za-z]{2}${5} | awk '{print $1 ":\t" $5}'

jaimeanrm · 2013-07-30 17:02:07 132
Colorizes an access log

Puts a splash of color in your access logs. IP addresses are gray, 200 and 304 are green, all 4xx errors are red. Works well with e.g. "colorize access_log | less -R" if you want to see your colors while paging. Use as inspiration for other things you might be tailing, like syslog or vmstat Usage: tail -f access.log | colorize
This is sample output - yours may be different.
1

function colorize() { c="--line-buffered --color=yes"; GREP_COLORS="mt=01;34" egrep $c '(^| 200 | 304 )' "${@}" | GREP_COLORS="mt=02;31" egrep $c '(^|"(GET|POST) .*[^0-9] 4[0-1][0-9] )' | GREP_COLORS="ms=02;37" egrep $c '(^|^[0-9\.]+) ';}

mogsie · 2013-08-14 21:05:34 8
Download all images on a 4chan thread
This is sample output - yours may be different.
1

read -p "Please enter the 4chan url: "|egrep '//i.4cdn.org/[a-z0-9]+/src/([0-9]*).(jpg|png|gif)' - -o|nl -s https:|cut -c7-|uniq|wget -nc -i - --random-wait

unixmonkey73764 · 2014-03-09 05:56:14 6
Search for a line of text in a directory of files recursively (while limiting to certain file extensions)
This is sample output - yours may be different.
1

egrep -ir --include=*.{php,html,css} "(first|second)" .

CMCDragonkai · 2014-12-08 05:38:42 11
Map the slot of an I/O card to its PCI bus address

Recent hardware may or may not enumerate *both of* these values
This is sample output - yours may be different.
1

dmidecode --type 9 |egrep 'Bus Address|Designation'

mhs · 2015-01-27 15:13:59 8
Print all open regular files sorted by the number of file handles open to each.

This command run fine on my Ubuntu machine, but on Red Hat I had to change the awk command to `awk '{print $10}'`.
This is sample output - yours may be different.
1

sudo lsof | egrep 'w.+REG' | awk '{print $10}' | sort | uniq -c | sort -n

kennethjor · 2015-08-18 14:09:02 10

This dumps serial numbers of all the drives but HP warranty check does not say they are valid ... Show Sample Output

operat0r · 2016-07-20 17:42:40 13

Silently deletes lines containing a specific string in a bunch of files

This command will find all occurrences of one or more patterns in a collection of files and will delete every line matching the patterns in every file
This is sample output - yours may be different.
1

for file in $(egrep 'abc|def' *.sql | cut -d":" -f1 | uniq); do sed -i '/abc/d' ./$file ; sed -i '/def/d' ./$file; done

guillaume1306 · 2018-12-10 16:23:20 30
get total of inodes of root partition
This is sample output - yours may be different.
1

du --total --inodes / | egrep 'total$'

aysadk · 2019-07-02 09:08:35 38
grep or

search file for string1 or string2
This is sample output - yours may be different.
0

egrep 'string1|string2' file

jcgam69 · 2009-02-20 20:41:33 4
Lists open ports
This is sample output - yours may be different.
0

netstat -antuwp | egrep "(^[^t])|(^tcp.*LISTEN)"

stelio · 2009-03-25 13:44:43 6
Show the files that you've modified in an SVN tree

This is useful for piping to other commands, as well: svn status | egrep '^(M|A)' | egrep -o '[^MA\ ].*$' | xargs $EDITOR
This is sample output - yours may be different.
0

svn status | egrep '^(M|A)' | egrep -o '[^MA\ ].*$'

isaacs · 2009-03-27 05:18:24 6
Count how many times a certain referer appears in your apache log

I use this (well I normally just drop the F=*.log bit and put that straight into the awk command) to count how many times I get referred from another site. I know its rough, its to give me an idea where any posts I make are ending up. The reason I do the Q="query" bit is because I often want to check another domain quickly and its quick to use CTRL+A to jump to the start and then CTRL+F to move forward the 3 steps to change the grep query. (I find this easier than moving backwards because if you group a lot of domains with the pipe your command line can get quite messy so its normally easier to have it all at the front so you just have to edit it & hit enter). For people new to the shell it does the following. The Q and F equals bits just make names we can refer to. The awk -F\" '{print $4}' $F reads the file specified by $F and splits it up using double-quotes. It prints out the fourth column for egrep to work on. The 4th column in the log is the referer domain. egrep then matches our query against this list from awk. Finally wc -l gives us the total number of lines (i.e. matches). Show Sample Output
This is sample output - yours may be different.
```
jaymz@bowser:~/Desktop/tmp$ Q="reddit"; F=*.log; awk -F\" '{print $4}' $F | egrep $Q | wc -l
32159
```
0

Q="reddit|digg"; F=*.log; awk -F\" '{print $4}' $F | egrep $Q | wc -l

jaymzcd · 2009-05-05 21:51:16 6
Check syntax of all PHP files before an SVN commit

Really only valuable in a PHP-only project directory. This is using standard linux versions of the tools. On most older BSD variants of sed, use -E instead of -r. Or use: sed 's/\+[[:space:]]\{1,\}//' instead. Show Sample Output
This is sample output - yours may be different.
```
No syntax errors detected in blah/crap.php
No syntax errors detected in thing/stuff.php
PHP Warning:  Unterminated comment starting line 38 in otherthing/include/bootstrap.php on line 38
```
0

for i in `svn status | egrep '^(M|A)' | sed -r 's/\+\s+//' | awk '{ print $2 }'` ; do if [ ! -d $i ] ; then php -l $i ; fi ; done

brephophagist · 2009-05-29 23:59:28 5
Finds all of the mailers being used in your rails app
This is sample output - yours may be different.
0

egrep -r '(render_message|multipart).*('`find app/views -name '*.erb' | grep mailer | sed -e 's/\..*//' -e 's/.*\///' | uniq | xargs | sed 's/ /|/g'`')' app/models

foobarfighter · 2009-06-12 18:53:29 5
Check if you need to run LaTeX more times to get the refefences right

LaTeX is not a smart compiler - You need to run it several times to make it back-patch all the missing refs. The message if to do so or not is buried in its endless output and the log file. This grep lines helps to find it.
This is sample output - yours may be different.
0

egrep "(There were undefined references|Rerun to get (cross-references|the bars) right)" texfile.log

gwiener · 2009-07-07 06:48:03 6
get IPs with a DHCP lease

You can use that to create a excludefile for nmap, to find hosts, with no DHCP lease in your DHCP range. Show Sample Output
This is sample output - yours may be different.
```
192.168.0.73
192.168.0.99
192.168.0.38
192.168.0.77
192.168.0.98
192.168.0.46
192.168.0.13
```
0

egrep "^lease" /var/lib/dhcp/db/dhcpd.leases |awk '{ print $2 }'

peshay · 2009-08-14 07:31:00 3
Show a script or config file without comments
This is sample output - yours may be different.
0

egrep -v "^[[:blank:]]*($|#|//|/\*| \*|\*/)" somefile

sdadh01 · 2009-11-10 18:49:19 5
Provides external IP, Country and City in a formated manner.

If used without arguments, returns own IP info. If used with argument, returns info about the parsed argument. Show Sample Output
This is sample output - yours may be different.
```
$ geoip google.com
     |  IP Address: 74.125.53.100                                       |
     |     Country: United_States [united states]                       |
     |        City: Mountain View                                       |
```
0

geoip () { curl -s "http://www.geoiptool.com/?IP=$1" | html2text | egrep --color 'City:|IP Address:|Country:' }

wizel · 2009-11-15 17:59:23 3
Extract URL from SVN working copy

Can be used in a working copy to output the URL (extracted from svn info), or as part of another function, as $(svnurl some/path). Saves a lot of time in my SVN workflow.
This is sample output - yours may be different.
0

function svnurl() { svn info $1 | egrep '^URL: (.*)' | sed s/URL\:\ //; }

thebuckst0p · 2010-02-12 15:42:54 3
Show the ndd ip settings of a solaris device

This command is jsut for the main IP settings of ndd. if you need ip6 or icmp edit the text within the egrep inclusion area. Felix001 - www.Fir3net.com Show Sample Output
This is sample output - yours may be different.
```
ip_respond_to_echo_broadcast 0
ip_respond_to_echo_multicast 0
ip_respond_to_timestamp 0
ip_send_redirects 0
ip_debug 0
ip_mrtdebug 0
ip_ire_timer_interval 60000
ip_ire_arp_interval 60000
ip_ire_redirect_interval 60000
ip_def_ttl 255
ip_forward_src_routed 0
```
0

for i in `ndd /dev/ip \? | awk '{ print $1 }' | egrep -v "ip6|status|icmp|igmp|\?"` ; do echo $i `ndd -get /dev/ip $i` ; done | grep -v \?

felix001 · 2010-02-15 12:32:33 6
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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"

Delete all but the latest 5 files

yes 6 (tail from 6th line)

See why a program can't seem to access a file

Sometimes a program refuses to read a file and you're not sure why. You may have display_errors turned off for PHP or something. In this example, fopen('/var/www/test/foo.txt') was called but doesn't have read access to foo.txt. Strace can tell you what went wrong. E.g., if php doesn't have read access to the file, strace will say "EACCESS (Permission denied)". Or, if the file path you gave doesn't exist, strace will say "ENOENT (No such file or directory)", etc. This works for any program you can run from the command-line, e.g., strace python myapp.py -e open,access... Note: the above command uses php-cli, not mod_php, which is a different SAPI with diff configs, etc.

easily strace all your apache *child* processes

Like the original version except it does not include the parent apache process or the grep process and adds "sudo" so it can be run by user.

Vectorize xkcd strips

Uses ImageMagick and potrace to vectorize the input image, with parameters optimized for xkcd-like pictures.

send substituted text to a command without echo, pipe

zsh only - This avoids the need for echo "message" | which creates an entire subshell. Also, the text you are most likely to edit is at the very end of the line, which, in my opinion, makes it slightly easier to edit.

Lists all listening ports together with the PID of the associated process

Lists all opened sockets (not only listeners), no DNS resolution (so it's fast), the process id and the user holding the socket. Previous samples were limiting to TCP too, this also lists UDP listeners.

Use "most" as your man pager

you should have the "most" package installed. I like it because it is colorful and easier to read. alternatively you can use "less" instead of "most". you can also add this to your ~/.bashrc to make it permanent.

Compression formats Benchmark

See: http://imgur.com/JgjK2.png for example. Do some serious benchmarking from the commandline. This will write to a file with the time it took to compress n bytes to the file (increasing by 1). Run: $ gnuplot -persist

which process is accessing the CDROM

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Commands using egrep (220)

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