Commands using grep (1,935)
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If you run dpkg --clear-selections or have otherwise selected installed packages for deinstall, but want to undo it, run this. It will set all installed packages back to installed status so that they won't be removed by commands like "dpkg -Pa"
0dpkg -l | grep ^ri | awk '{print $2 " install"}' | sudo dpkg --set-selections -
0export KEEP_KERNEL=2; dpkg -l 'linux-image*' | awk '/^ii/ { print $2 }' | grep "[0-9]" | awk 'BEGIN{i=1}{print i++, $0}' | grep `uname -r` -B99 | sort -r | tail -n+$(($KEEP_KERNEL+2)) | awk '{print $2}'| xargs apt-get -y purge
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Kills all processes with a certain string. This was done to kill all ssh sessions openned by zenoss which look like: usr/bin/ssh /opt/zenoss/bin/zenmodeler
0for line in `ps aux | grep <string> | awk '{print $2}'`; do sudo kill $line; done; -
0function hgr() { grep --color -i "${1}" ~/.bash_history | sed -e 's/^ *//g' -e 's/ *$//g' | sort | uniq; }
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0xdpyinfo | grep dimensions | awk '{print $2}'
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-c will count the number of times your search matches in the file. Show Sample Output
0grep -c "search_string" /path/to/file -
Shows all available keyboard bindings in bash. Pretty printing. Show Sample Output
0bind -P | grep -v "is not" | sed -e 's/can be found on/:/' | column -s: -t -
This lists the number of ogg/mp3/wav/flac files in each subdirectory of the current directory. The output can be sorted by piping it into "sort -n". Show Sample Output
0find . -type d -maxdepth 1 -print0 | xargs -0 -I{} sh -c 'find "{}" -type f | grep "ogg\|mp3\|wav\|flac$" | wc -l | tr -d "\n"; echo " {}"' -
This command will show the sum total of memory used in gigabytes by a program that spawns multiple instances of itself. Replace chrome with whatever program's memory usage you are investigating. This command is rather useless on software that only spawns a single instance of itself. Show Sample Output
0ps -eo pmem,comm | grep chrome | cut -d " " -f 2 | paste -sd+ | bc -
With this command, you can check the difference between the volumes mounted and the volume in /etc/fstab.
0diff <(cat /etc/fstab | grep vol | grep -v "^#" | awk '{print $1}') <(df -h | grep vol) -
0wget -q -O- http://bitinfocharts.com/markets/btc-e/btc-usd.html |grep -o -P 'lastTrade">([0-9]{1,})(.){0,1}[0-9]{0,}' |grep -o -P '(\d)+(\.){0,1}(\d)*' |head -n 1
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Maps block devices to the PCIe nodes
0udevadm info -q all -n /dev/sdb | grep ID_PATH | cut -d'-' -f 2 | xargs -n 1 lspci -s -
Displays memory usage for individual instances of an application that spawns multiple instances of itself. This command also works on single process applications. Show Sample Output
0ps -eo pmem,comm | grep application-name -
Connects to the last adb connection in history. Show Sample Output
0eval $(history | cut -c 8- | grep "adb connect [0-9]" | tail -1) -
Another way to view some code by keyword and basic regular expression
0locate *\\.php|xargs grep --color=always -i -5 "namespace\s.*\W"|less -
for redhat systems works sometimes :S tested on dell poweredge r7+ systems
0lspci -vv | grep 'Ethernet\|Serial' | awk 'NR == 1{ printf $1 } NR == 2 { print " mac " $7 }' | sed ?e 's/-/:/g' -e 's/:f[ef]:f[ef]//g' -e 's/01:00.0/eth0/g' -e 's/01:00.1/eth1/g' -e 's/01:00.2/eth2/g' -e 's/01:00.3/eth3/g' > /etc/iftab && ifrename -
Actually grep can do recursive search based on file extensions.
0grep -r --include=*.php "something" /foo/bar -
Be careful, first run: lsof | grep -i deleted | grep REG | grep -v txt Then, give it the boot!
0lsof | grep -i deleted | grep REG | grep -v txt | ruby -r 'pp' -e 'STDIN.each do |v| a = v.split(/ +/); puts `:> /proc/#{a[1]}/fd/#{a[3].chop}`; end' -
Easiest way to obtain the busiest website list (sorted by number of process running). Show Sample Output
0/usr/bin/lynx -dump -width 500 http://127.0.0.1/whm-server-status | grep GET | awk '{print $12}' | sort | uniq -c | sort -rn | head -
List the busiest scripts/files running on a cPanel server with domain showing (column $12). Show Sample Output
0/usr/bin/lynx -dump -width 500 http://127.0.0.1/whm-server-status | grep GET | awk '{print $12 $14}' | sort | uniq -c | sort -rn | head -
Using "wmic get * /value" within any Cygwin shell will return lots of Win/Dos newline junk ie "^M$" at the end of found value line, two lines ("$" Unix newline) above, and three below. This makes storing and or evaluating wmic queries as variables a pain. The method i suggest strips the mentioned junk, only returns the value after "OSArchitecture=", and includes only one Unix style newline. Other methods using sed|awk|cut can only handle the output of wmic cleanly when piped or using multiple sed statements.
wmic OS get OSArchitecture /value | sed 's/\r//g;s/^M$//;/^$/d;s/.*=//'makingwmic OS get OSArchitecture /value | grep -Eo '[^=]*$'a much cleaner and slightly less costly alternative. Show Sample Output0wmic OS get OSArchitecture /value | grep -Eo '[^=]*$' -
In a multiple PostgreSQL server environment knowing the servers version can be important. Note that psql --version returns just the local psql apps version which may not be what you want. This command dumps the PostgreSQL servers version out to one line. You may need to add more command line options to the psql command for your connection environment. Show Sample Output
0psql -h <SERVER NAME HERE> -c 'SELECT version();' | grep -v 'version\|---\|row\|^ *$' | sed 's/^\s*//' -
Grep can search files and directories recursively. Using the -Z option and xargs -0 you can get all results on one line with escaped spaces, suitable for other commands like rm. Show Sample Output
0grep -Rl "pattern" files_or_dir -
0for w in [WORT1] [WORTn]; do wget -O $w.mp3 $(wget -O - "http://www.duden.de/rechtschreibung/$w" | grep -o "http://www.duden.de/_media_/audio/[^\.]*\.mp3"); done
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Find all private keys and dump their fingerprints. Show Sample Output
0for id in `ls -1 ~/.ssh | grep -v "authorized\|known_hosts\|config\|\."` ; do echo -n "$id: " ; ssh-keygen -l -f .ssh/$id ; done - ‹ First < 49 50 51 52 53 > Last ›
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