Commands tagged grep sorted by votes

Commands tagged grep (409)

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worse alternative to <ctrl+r>

worse alternative to ctrl+r: grep the history removing duplicates without sorting (case insensitive search). Show Sample Output
This is sample output - yours may be different.
```
head ~/.bash_history # history sample for reference:
echo "duplicate"
awk --help
echo "duplicate"
echo "ctrl+r is better"

# input:
memo echo

# output:
echo "duplicate"
echo "ctrl+r is better"
```
1

function memo() { awk '! seen[$0]++' <<< $(grep -i "$@" ~/.bash_history ); }

mikhail · 2019-04-04 00:54:43 36
monitor my process group tree
This is sample output - yours may be different.
1

watch "ps --forest -o pid=PID,tty=TTY,stat=STAT,time=TIME,pcpu=CPU,cmd=CMD -g $(ps -o sid= -p $(pgrep -f "<my_process_name>"))"

tomash · 2019-04-26 11:48:09 38
Filter the output of a file continously using tail and grep
This is sample output - yours may be different.
1

tail -f path | grep your-search-filter

gmadorell · 2019-05-30 14:08:39 37
List the binaries installed by a Debian package

This shell function displays a list of binaries contained in an installed package; works on Debian based Linux distributions. Show Sample Output
This is sample output - yours may be different.
```
$ binaries findutils
find
xargs
```
1

binaries () { for f in $(dpkg -L "$1" | grep "/bin/"); do basename "$f"; done; }

lordtoran · 2019-10-05 10:37:51 439
List the binaries installed by a Debian package

GNU grep's perl-compatible regular expression(PCRE).
This is sample output - yours may be different.
1

binaries () { dpkg -L "$1" | grep -Po '.*/bin/\K.*'; }

metropolis · 2019-10-05 10:52:15 177
extract email addresses from some file (or any other pattern)
This is sample output - yours may be different.
1

grep -Eio '([[:alnum:]_.-]{1,64}@[[:alnum:]_.-]{1,252}?\.[[:alpha:].]{2,6})'

mikhail · 2020-07-22 22:40:33 131
Download mp3 files linked in a RSS podcast feed

Directly download all mp3 files of the desired podcast
This is sample output - yours may be different.
1

curl http://radiofrance-podcast.net/podcast09/rss_14726.xml | grep -Eo "(http|https)://[a-zA-Z0-9./?=_%:-]*mp3" | sort -u | xargs wget

pascalvaucheret · 2021-08-09 13:40:26 179
Find failures with journalctl

Sometimes things break. You can find the most recent errors using a combination of journalctl, along with the classic tools sort and uniq Show Sample Output
This is sample output - yours may be different.
```
898172 "/usr/bin/dockerd"
    752 "/usr/local/sbin/node_exporter"
     30 "/usr/bin/gnome-shell"
     26 "/usr/bin/cat"
     22 "/usr/libexec/gsd-media-keys"
[...]
```
1

journalctl --no-pager --since today --grep 'fail|error|fatal' --output json | jq '._EXE' | sort | uniq -c | sort --numeric --reverse --key 1

mikhail · 2021-12-22 22:27:17 212
Loops over files, runs a command, dumps output to a file

In this case I'm selecting all php files in a dir, then echoing the filename and piping it to ~/temp/errors.txt. Then I'm running my alias for PHPCS (WordPress flags in my alias), then piping the PHPCS output to grep and looking for GET. Then I'm piping that output to the same file as above. This gets a list of files and under each file the GET security errors for that file. Extrapolate this to run any command on any list of files and pipe the output to a file. Remove the >> ~/temp/errors.txt to get output to the screen rather than to a file. Show Sample Output
This is sample output - yours may be different.
```
header.php
index.php
page.php
search.php
  19 | ERROR   | [ ] Detected usage of a possibly undefined superglobal array index: $_GET['s']. Use isset() or empty() to check the index exists before using it
  99 | ERROR   | [x] Short PHP opening tag used with echo; expected "<?php echo $_GET ..." but found "<?= $_GET ..."
  99 | ERROR   | [ ] All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$_GET['s']'.
```
1

for f in *php; do echo $f >> ~/temp/errors.txt; phpcsw $f | grep GET >> ~/temp/errors.txt; done

topher1kenobe · 2023-04-12 14:17:14 366
Working random fact generator

This is a working version, though probably clumsy, of the script submitted by felix001. This works on ubuntu and CygWin. This would be great as a bash function, defined in .bashrc. Additionally it would work as a script put in the path. Show Sample Output
This is sample output - yours may be different.
```
The only letter not appearing on the Periodic Table is the letter "J".
```
0

lynx -dump randomfunfacts.com | grep -A 3 U | sed 1D

xizdaqrian · 2009-05-05 07:52:10 12
Match non-empty lines

I had some trouble removing empty lines from a file (perhaps due to utf-8, as it's the source of all evil), \W did the trick eventually.
This is sample output - yours may be different.
0

grep -v "^\W$" <filename>

nikc · 2009-06-18 08:17:22 17
Fast grepping (avoiding UTF overhead)

greps using only ascii, skipping the overhead of matching UTF chars. Some stats: $ export LANG=C; time grep -c Quit /var/log/mysqld.log 7432 real 0m0.191s user 0m0.112s sys 0m0.079s $ export LANG=en_US.UTF-8; time grep -c Quit /var/log/mysqld.log 7432 real 0m13.462s user 0m9.485s sys 0m3.977s Try strace-ing grep with and without LANG=C
This is sample output - yours may be different.
0

export LANG=C; grep string longBigFile.log

ioggstream · 2009-07-14 12:48:02 9
Lists unambigously names of all xml elements used in files in current directory

This one will work a little better, the regular expressions it is not 100% accurate for XML parsing but it will suffice any XML valid document for sure. Show Sample Output
This is sample output - yours may be different.
```
a
b
body
br
center
div
fieldset
font
form
func:function
func:result
h1
h2
h4
head
html
i
img
input
label
li
link
meta
noscript
option
p
sc
script
select
span
strong
style
table
tbody
td
textarea
th
title
tr
ul
xsl:apply-templates
xsl:attribute
xsl:call-template
xsl:choose
xsl:copy-of
xsl:for-each
xsl:if
xsl:include
xsl:otherwise
xsl:param
xsl:stylesheet
xsl:template
xsl:text
xsl:value-of
xsl:variable
xsl:when
xsl:with-param
```
0

grep -Eho '<[a-ZA-Z_][a-zA-Z0-9_-:]*' * | sort -u | cut -c2-

inkel · 2009-08-05 21:54:29 3
Edit all files found having a specific string found by grep

This will drop you into vim to edit all files that contain your grep string.
This is sample output - yours may be different.
0

grep -ir 'foo' * | awk '{print $1}' | sed -e 's/://' | xargs vim

elubow · 2009-09-03 15:12:27 3
Edit all files found having a specific string found by grep

saves one command. Needs GNU grep though :-(
This is sample output - yours may be different.
0

grep -ir 'foo' * | awk -F '{print $1}' | xargs vim

verboEse · 2009-09-03 15:58:47 3
Search through files, ignoring .svn

D/l ack from http://betterthangrep.com/
This is sample output - yours may be different.
0

ack -ai 'searchterm'

dere22 · 2009-09-09 14:05:27 6
regex to match an ip

This obey that you don't match any broadcast or network addresses and stay between 1.1.1.1 - 254.254.254.254
This is sample output - yours may be different.
0

echo 254.003.032.3 | grep -P '^((25[0-4]|2[0-4]\d|[01]?[\d]?[1-9])\.){3}(25[0-4]|2[0-4]\d|[01]?[\d]?[1-9])$'

foob4r · 2009-09-17 12:59:44 7
Colorized grep in less
This is sample output - yours may be different.
0

ack --pager='less -r'

unixmonkey5780 · 2009-09-25 13:01:58 3
Extract all urls from the last firefox sessionstore.js file used.

Require "grep -P" ( pcre ). If you don't have grep -P, use that : grep -Eo '"url":"[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q) | cut -d'"' -f4
This is sample output - yours may be different.
0

grep -oP '"url":"\K[^"]+' $(ls -t ~/.mozilla/firefox/*/sessionstore.js | sed q)

sputnick · 2009-12-09 20:34:32 4
Extract names and email addresses from LDIF files
This is sample output - yours may be different.
0

grep -E '^(cn|mail):' file.ldif | sed -e 's/^[a-z]*: //'

linuxnetbook · 2010-01-27 22:29:02 4
add all files not under version control to repository

This version makes uses of Bash shell expansion, so it might not work in all other shells.
This is sample output - yours may be different.
0

svn add $(svn st|grep ^\?|cut -c2-)

inkel · 2010-01-28 09:48:46 53
Recursively grep thorugh directory for string in file.

The difference between this and the other alternatives here using only grep is that find will, by default, not follow a symlink. In some cases, this is definitely desirable. Using find also allows you to exclude certain files, eg find directory/ ! -name "*.tmp" -exec grep -ni phrase {} + would allow you to exclude any files .tmp files. Also note that there's no need for calling grep recursively, as find passes each found file to grep.
This is sample output - yours may be different.
0

find directory/ -exec grep -ni phrase {} +

sanmiguel · 2010-01-28 12:15:24 3
Recursively search a directory tree for all .php .inc .html .htm .css .js files for a certain string
This is sample output - yours may be different.
0

find -type f -regex ".*\.$js\|php\|inc\|htm[l]?\|css$$" -exec grep -il 'searchstring' '{}' +

tuxilicious · 2010-02-07 23:41:00 5
Search for a pattern across files in a code base (leaving out CVS directories)

I use this sometimes when ctags won't help.
This is sample output - yours may be different.
0

for f in $(find /path/to/base -type f | grep -vw CVS); do grep -Hn PATTERN $f; done

nikunj · 2010-06-29 15:58:11 6
Get IPv4 of eth0 for use with scripts
This is sample output - yours may be different.
0

ifconfig eth0 | awk '/inet / {print $2}' | cut -d ':' -f2

mrwill · 2010-06-30 08:52:01 3
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Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

move up through directories faster (set in your /etc/profile or .bash_profile)

You can also remove the "&& pwd" if you don't want it to print out each directory as it moves up.

Blink Caps Lock on HDD activity

Some computers these days don't have an HDD activity light, but they still have a useless caps-lock, so why not re-purpose that light to show HDD activity? Requires setleds and dstat and probably needs to run as root.

Have a smile

Outputs utf-8 smileys

Remove space and/or tab characters at the end of line

The command removes all space and/or tabulation characters preceding new line

Delete all but latest file in a directory

Useful for deleting old unused log files.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

NSA codename generator

nsacodenamegenerator dot com is no more outputs random two words together in capital letters

Measure, explain and minimize a computer's electrical power consumption

Run this command as root to get enough stats. It works on AMD and Intel machines, including desktops. If ran on a laptop it'll give you suggestions on extending your battery life. You'll need to install PowerTOP if you don't have, via 'apt-get install powertop', etc. To grep the output use: sudo powertop -d | grep ... The many command suggestions PowerTOP gives you alone will increase your command-line fu!

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)

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Commands tagged grep (409)

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