Commands using egrep sorted by votes

Commands using egrep (220)

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Search for java explicit incrementation

Search for java explicit incrementation in order to replace it with postfix or assignment operator Show Sample Output
This is sample output - yours may be different.
```
i = i + 1;
j = j - 1;
iter = iter + 2;
```
0

egrep "([_a-zA-Z][_a-zA-Z0-9]*) *= *\1 *[*/+-] *[0-9]+ *;"

aandre · 2012-04-09 12:42:07 3
Returns last day of current month

Returns last day of current month. Useful to implement a bash script backup based on a GFS strategy. Show Sample Output
This is sample output - yours may be different.
```
$  cal | egrep -e '^ [0-9]|^[0-9]' | tr '\n' ' ' | awk '{print $NF}'
30
```
0

cal | egrep -e '^ [0-9]|^[0-9]' | tr '\n' ' ' | awk '{print $NF}'

gouverney · 2012-04-16 11:58:09 30
Get all links of a website
This is sample output - yours may be different.
0

lynx -dump http://www.domain.com | awk '/http/{print $2}' | egrep "^https{0,1}"

khaled_eng15 · 2012-04-23 10:41:02 3
Get all links of a website
This is sample output - yours may be different.
0

lynx -dump http://www.cooks4arab.com | awk '/http/{print $2}' | egrep "^https{0,1}"

khaled_eng15 · 2012-04-23 10:43:33 3
Generate random password, human readable with no special characters.
This is sample output - yours may be different.
0

false; while [ $? != 0 ]; do apg -c /dev/urandom -n1 -E oOlL10 | egrep '^[[:alnum:]]+$'; done

evolix · 2012-04-24 08:30:28 4
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. When i saw the command i had some ideas to make it shorter. Here is my version.
This is sample output - yours may be different.
0

egrep 'ServerAlias|ServerName' /etc/apache2/sites-enabled/*.conf | awk '{printf "%s\t%s\n",$2,$3}' | sed 's/www.//' | sort | uniq

staeff · 2012-07-25 12:51:15 3
sum and average of requests responses times or sizes in Apache2 access log

Depending on your Apache access log configuration you may have to change the sum+=$11 to previous or next awk token. Beware, usually in access log last token is time of response in microseconds, penultimate token is size of response in bytes. You may use this command line to calculate sum and average of responses sizes. You can also refine the egrep regexp to match specific HTTP requests. Show Sample Output
This is sample output - yours may be different.
```
Tot=134020202(15201)
Avg=8816.54
```
0

egrep '.*(("STATUS)|("HEAD)).*' http_access.2012.07.18.log | awk '{sum+=$11; ++n} END {print "Tot="sum"("n")";print "Avg="sum/n}'

fanchok · 2012-07-27 12:18:29 3

Display IP addresses Pidgin IM Client is connected to

lsof -p `pidof pidgin` | awk '{ print $9 }'|egrep `hostname` | grep -o ">[^:]\+:" | tr -d ":>" | while read line; do host $line; done;

NaN0 · 2012-08-08 14:47:20 3

Get URL's from a webpage

Get link to external sites of a url Show Sample Output

curl url | egrep -o '(http|https)://[a-z0-9]*\.[a-z0-9]*\.[a-z0-9]*'|sort |uniq

dbinary · 2012-08-08 17:37:40 3

Short Information about loaded kernel modules
This is sample output - yours may be different.
0

lsmod | tail -n +2 | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'

vlaad · 2012-09-03 17:59:49 4
What is my ip?

looks at html for "ip" (it's a CSS class), then a little of cut and egrep to get IPv4 address. I use this oneliner into conky. Show Sample Output
This is sample output - yours may be different.
```
190.192.21.165
```
0

curl -s mi-ip.net | grep '"ip"' | cut -f2 -d ">" | egrep -o '[0-9.]+'

dragonauta · 2012-10-15 16:48:20 4
list uniq extensions of files from the current directory

find files recursively from the current directory, and list the extensions of files uniquely Show Sample Output
This is sample output - yours may be different.
```
bak
bat
cfg
conf
csv
doc
exe
exe_back
pyc
sql
txt
xls
```
0

find . -type f |egrep '^./.*\.' |sed -e "s/$^.*\.$$.*$$/\2/" |sort |uniq

dvst · 2012-11-12 17:17:55 8
Recursively search your directory tree files for a string
This is sample output - yours may be different.
0

alias gfind='find . -print0 | xargs -0 egrep -I '

pdunham · 2013-03-16 03:20:49 4
Display count of log entries via the previous minute for graphing purposes. Example given is for DHCPREQUESTS on an ISC dhcp service log.
This is sample output - yours may be different.
0

DATE=`date +"%H:%M" --date '-1 min'`; egrep "\ $DATE\:..\ " /var/log/dhcpd.log |awk '/DHCPREQUEST/ {split($3,t,":"); printf("%02d:%02d\n",t[1],t[2]);}' |uniq -c;

jobewan · 2013-03-17 02:23:37 5
Prints total line count contribution per user for an SVN repository

This one has a better performance, as it is a one pass count with awk. For this script it might not matter, but for others it is a good optiomization.
This is sample output - yours may be different.
0

svn ls -R | egrep -v -e "\/$" | xargs svn blame | awk '{count[$2]++}END{for(j in count) print count[j] "\t" j}' | sort -rn

kurzum · 2013-05-03 01:45:12 6
Netstat List out Remote IP's Connected to Server Only

I used this to get all the remote connection ip addresses connected to my server... I had to start storing and tracking this data so thats why i built this out... probably not optimal as far as the egrep regex but it works ;) Show Sample Output
This is sample output - yours may be different.
```
[root@stkevpublic1 NetMon]# netstat -tn | awk '{print $5}' | egrep -v '(localhost|\*\:\*|Address|and|servers|fff|127\.0\.0)' | sed 's/:[0-99999999].*//g'
108.18.144.120
68.181.195.4
```
0

netstat -tn | awk '{print $5}' | egrep -v '(localhost|\*\:\*|Address|and|servers|fff|127\.0\.0)' | sed 's/:[0-99999999].*//g'

kehansen · 2013-06-13 14:35:38 11
kvm disk info

This will strip out the relivent disk information from kvm. I'm using it to find disks on a SAN which are no longer in use. Show Sample Output
This is sample output - yours may be different.
```
name0 --      <source dev='/dev/mapper/name0-os'/>
      <source file='/dev/mapper/name0-data'/>
name1 --      <source dev='/dev/mapper/name1-os'/>
      <source file='/dev/mapper/name1-data'/>
```
0

while read X ; do printf "$X --"; virsh dumpxml $X | egrep "source dev|source file"; done< <(virsh list | awk '$1 ~ /^[1-9]/ { print $2 }')

hugme · 2013-07-29 17:32:59 1213
Print machine's ipv4 addresses
This is sample output - yours may be different.
0

echo $(ifconfig) | egrep -o "en.*?inet [^ ]* " | sed 's/.*inet $.*$$/\1/' | tail -n +2

davethomas11 · 2014-06-19 22:09:03 7
Btrfs: Find file names with checksum errors

Filter entries in OpenSuse /var/log/messages like: timestamp servername kernel: [83242.108090] btrfs: checksum error at logical 1592344576 on dev /dev/sda5, sector 5223584, root 5, inode 2652, offset 282624, length 4096, links 1 (path: log/warn) Show Sample Output
This is sample output - yours may be different.
```
lib/mysql/ib_logfile0
lib/mysql/ibdata1
log/warn
```
0

grep "btrfs: checksum error at logical" /var/log/messages | egrep -o "[^ ]+$" | tr -d ')' | sort | uniq

jcoll · 2014-07-01 08:15:26 7
Get unique basewords from Hashcat pot
This is sample output - yours may be different.
0

cut -f 2 -d ':' oclHashcat.pot | egrep -oi '[a-z]{1,20}' | sort | uniq > base.pot

Creek · 2014-07-14 21:03:22 6
Find errors and packet loss on network cards

A grep against ethtool to look for common errors and packet loss statistics which network drivers report in their private data, which is queried with ethool -S. This is the current grep used in xsos (https://github.com/ryran/xsos), which I originally contributed and has been improved by the community over time. Show Sample Output
This is sample output - yours may be different.
```
    rx_fw_discards: 1035
```
0

ethtool -S eth0 | egrep "(drop|disc|err|fifo|buf|fail|miss|OOB|fcs|full|frags|hdr|tso).*: [^0]"

suprjami · 2014-07-15 05:27:34 7
Print all interfaces IP and Mac address in the same line

Thx Mass1 for the sharing
This is sample output - yours may be different.
0

ifconfig | egrep -A2 "eth|wlan" | tr -d "\n"| sed 's/\-\-/\n/g'|awk '{print "mac: "$5 " " $7}' | sed 's/addr:/addr: /g'

Koobiac · 2014-09-11 08:18:18 9
Get user's full name in Mac OS X

Its possible to user a simple regex to extract de username from the finger command. The final echo its optional, just for remove the initial space Show Sample Output
This is sample output - yours may be different.
```
$ finger $(whoami) | egrep -o 'Name: [a-zA-Z0-9 ]{1,}' | cut -d ':' -f 2 | xargs echo                                                           2.1.2
Sebastian Webber
```
0

finger $(whoami) | egrep -o 'Name: [a-zA-Z0-9 ]{1,}' | cut -d ':' -f 2 | xargs echo

swebber · 2014-09-24 01:22:07 9
Use grep to get multiple patterns.

Using egrep to search multiple patterns. Show Sample Output
This is sample output - yours may be different.
```
ERROR: This is an error message.
CRITICAL: This is a critical message.
WARNING: This is a warning message.
```
0

egrep -wi --color 'warning|error|critical'

krizzo · 2014-10-07 17:06:39 8
Dumpe2fs, FSck running

To check the total number of mounts, maximum number of mounts before performing the fsck and last time when the fsck was performed. Show Sample Output
This is sample output - yours may be different.
```
dumpe2fs 1.42.9 (28-Dec-2013)
Mount count:              11
Maximum mount count:      27
Last checked:             Thu Apr 10 22:38:46 2014
Check interval:           0 (<none>)
```
0

dumpe2fs -h /dev/xvda1 | egrep -i 'mount count|check'

manju712 · 2014-10-22 08:38:43 8
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reduce mp3 bitrate (and size, of course)

Useful if you have to put some mp3 files into mobile devices (ie mobile phones with no much memory)

Check if x86 Solaris based system is 32bit or 64bit

This is likely only valid on Solaris based systems. Unfortunately a lot of the more universal techniques for determining if a system is 32bit or 64bit on x86 solaris fail to give much more information than "i86pc"

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

grep compressed log files without extracting

accomplishes the same thing without unzipping the whole file, and while i have never seen a log.tar.gz file that was a binary, i will concede that it might happen, so add the -a in there: $zgrep -ia "string" log.tar.gz it's still shorter/easier to type...

Find the most recently changed files (recursively)

list files recursively by size

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"

Create incremental snapshots of individual folders using find and tar-gzip

Creates an incremental snapshot of individual folders.

Rename .JPG to .jpg recursively

This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

Purge configuration files of removed packages on debian based systems

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Commands using egrep (220)

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