Commands using grep sorted by votes

Commands using grep (1,935)

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remove junk

Especially good for exported ipython files Show Sample Output
This is sample output - yours may be different.
```
Remove comments and 2 enter marks
```
0

grep -v '^# In' viz.txt | cat -s > out.txt

shantanuo · 2022-06-08 04:01:11 507
Check out Gate number for your flight from CLI with Chrome

Check out Gate number for your flight from CLI with Chrome, html2texgt and grep. Works on Arch Linux (Garuda) and probably will work on others. Requirements: * google chrome (might work with chromium as well) * installed html2text (on archlinux: sudo pacman -S python-html2text) * installed grep (comes by default with your OS) * the gate number should be visible at the given website (it's not existent too early before the flight and also disappears after the flight departed) Please don't forget to replace the link to appropriate one, matching your flight. You can also wrap this into something like `whlie true; do ...; sleep 60; done' and this will check and tell you the gate number maximum in 1 minute after it appears on Avinor website. Show Sample Output
This is sample output - yours may be different.
```
Gate

A14
```
0

google-chrome-stable --headless --dump-dom --disable-gpu "https://avinor.no/flight/?flightLegId=dy754-osl-trd-20220726&airport=OSL" 2>/dev/null | html2text | grep -A2 Gate

sxiii · 2022-07-26 11:50:59 403
Show temp of all disk

Show temp of all disk with the drivetemp module activate Show Sample Output
This is sample output - yours may be different.
```
WDC WD5000AAKX-0(38°C)
ST500DM002-1BD14(34°C)
WDC WD5000AAKX-0(35°C)
WDC WD80EFZX-68U(37°C)
WDC WD40EFPX-68C(32°C)
WDC WD40EMAZ-51T(31°C)
ST3160811AS     (39°C)
WDC WD40EZRZ-00W(35°C)
SAMSUNG HD501LJ (33°C)
SAMSUNG HD501LJ (35°C)
SAMSUNG HD501LJ (35°C)
SAMSUNG HD501LJ (36°C)
ST3500620AS     (34°C)
ST500DM002-1BD14(35°C)
WDC WD5000AAKS-6(38°C)
```
0

grep -l "drivetemp" /sys/class/hwmon/hwmon*/name | while read f; do printf "%s(%-.2s°C)\n" "`<${f%/*}/device/model`" "`<${f%/*}/temp1_input`"; done

kokoparkletal · 2023-09-10 18:24:29 80
command line to drop all table from a databse
This is sample output - yours may be different.
-1

mysql -u uname dbname -e "show tables" | grep -v Tables_in | grep -v "+" | gawk '{print "drop table " $1 ";"}' | mysql -u uname dbname

dlamotte · 2009-02-05 14:53:09 31
Extract raw URLs from a file
This is sample output - yours may be different.
-1

egrep -ie "<*HREF=(.*?)>" index.html | awk -F\" '{print $2}' | grep ://

wwest4 · 2009-02-05 17:51:14 22
Check out hijacked files in clearcase
This is sample output - yours may be different.
-1

cleartool co -nc `cleartool ls -recurse | grep "hijacked" | sed s/\@\@.*// | xargs`

ultrahax · 2009-02-06 00:03:51 51
find and kill a zombie process

You cannot kill zombies, as they are already dead. But if you have too many zombies then kill parent process or restart service. You can kill zombie process using PID obtained from the above command. For example kill zombie proces having PID 4104: # kill -9 4104 Please note that kill -9 does not guarantee to kill a zombie process.
This is sample output - yours may be different.
-1

kill -HUP `ps -A -ostat,ppid,pid,cmd | grep -e '^[Zz]' | awk '{print $2}'`

6peng · 2009-02-06 02:42:14 15
change the all files which contains xxxxx to yyyyyy

This script first find all files which contains word xxxxx recursively. Then replace the word xxxxx to yyyyy of the files. Use case: - Web site domain change - Function name change of the program
This is sample output - yours may be different.
-1

grep -r -l xxxxx . | xargs perl -i -pe "s/xxxxx/yyyyy/g"

hassylin · 2009-02-06 08:18:50 18
show physical disk using

show physical disk using, except tmpfs, gvfs, and so on.
This is sample output - yours may be different.
-1

df -x tmpfs | grep -vE "(gvfs|procbususb|rootfs)"

bones7456 · 2009-02-09 01:54:05 12
find unmaintained ports that are installed on your system

only works for freeBSD where ports are installed in /usr/ports credit to http://wiki.freebsd.org/PortsTasks
This is sample output - yours may be different.
-1

cd /usr/ports; grep -F "`for o in \`pkg_info -qao\` ; \ do echo "|/usr/ports/${o}|" ; done`" `make -V INDEXFILE` | \ grep -i \|ports@freebsd.org\| | cut -f 2 -d \|

grep · 2009-02-16 21:07:35 8
find forms in a symfony 1.2 project

finds all forms instanciated into a symfony project, pruning svn files.
This is sample output - yours may be different.
-1

find apps/ -name "*.svn-base" -prune -o -print -name "*.php" | xargs grep -E 'new .+Form\('

ubermuda · 2009-02-17 14:56:01 8
Remove blank lines from a file

To save the result, redirect the output to another file. grep -v "^$" file1 > file2
This is sample output - yours may be different.
-1

grep -v "^$" file

hkyeakley · 2009-02-19 18:11:58 9
show open ports on computer

From 'man netstat' "netstat -i | -I interface [-abdnt] [-f address_family] [-M core] [-N system] Show the state of all network interfaces or a single interface which have been auto-configured (interfaces statically configured into a system, but not located at boot time are not shown). An asterisk (``*'') after an interface name indicates that the interface is ``down''. If -a is also present, multicast addresses currently in use are shown for each Ethernet interface and for each IP interface address. Multicast addresses are shown on separate lines following the interface address with which they are associated. If -b is also present, show the number of bytes in and out. If -d is also present, show the number of dropped packets. If -t is also present, show the contents of watchdog timers."
This is sample output - yours may be different.
-1

netstat -an | grep -i listen

scubacuda · 2009-02-19 19:27:49 9
know which version of the program is installed on your Debian and derivatives

Output: Version 3.2-0 (for example if you type # aptitude show bash | grep Vers Depends on the language of your distribution, because the name of the word "Version" in other languages may be different.
This is sample output - yours may be different.
-1

aptitude show $PROGRAM | grep Vers

aabilio · 2009-02-27 23:24:37 8
Log output from a cronjob to a file, but also e-mail if a string is found

The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.
This is sample output - yours may be different.
-1

some_cronjobed_script.sh 2>&1 | tee -a output.log | grep -C 1000 ERROR

DEinspanjer · 2009-03-06 17:51:13 7
SVN Add Recursively

This adds all new files to SVN recursively. It doesn't work for files that have spaces in their name, but why would you create a file with a space in its name in the first place?
This is sample output - yours may be different.
-1

svn status | grep "^\?" | awk '{print $2}' | xargs svn add

unixfu73000 · 2009-03-12 15:06:12 8
Change all instances of a word in all files in the current directory

This command will replace all instances of 'foo' with 'bar' in all files in the current working directory.
This is sample output - yours may be different.
-1

perl -pi -e 's/foo/bar/g' $(grep -l foo ./*)

dopeman · 2009-03-27 17:18:08 6
Change all instances of a word in all files in the current directory and it's sub-directories

This command will replace all instances of 'foo' with 'bar' in all files in the current working directory and any sub-directories.
This is sample output - yours may be different.
-1

perl -pi -e 's/foo/bar/g' $(grep -rl foo ./*)

dopeman · 2009-03-27 17:21:35 10
Find all python modules that use the math module
This is sample output - yours may be different.
-1

find . -name "*.py" -exec grep -n -H -E "^(import|from) math" {} \;

chillihead · 2009-03-31 19:56:42 6
quick and easy way of validating a date format of yyyy-mm-dd and returning a boolean

Quick and easy way of validating a date format of yyyy-mm-dd and returning a boolean, the regex can easily be upgraded to handle "in betweens" for mm dd or to validate other types of strings, ex. ip address. Boolean output could easily be piped into a condition for a more complete one-liner.
This is sample output - yours may be different.
-1

echo 2006-10-10 | grep -c '^[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]$'

rez0r · 2009-05-11 22:18:43 7
Do an OR search using grep to look for more than one search term

This is a simple but useful command to search for multiple terms in a file at once. This prevents you from having to do mutliple grep's of the same file. Show Sample Output
This is sample output - yours may be different.
```
~> cat myFile.txt
hello
commandlinefu
how
are
you today?

Sincerely,
The World
~> grep -i 'hello\|world' myFile.txt
hello
The World
~>
```
-1

grep -i '<searchTerm>\|<someOtherSearchTerm>' <someFileName>

scifisamurai · 2009-05-11 23:05:54 8
display portion of a file

This is useful for displaying a portion of a FILE that contains an error at line NUMBER
This is sample output - yours may be different.
-1

cat -n FILE | grep -C3 "^[[:blank:]]\{1,5\}NUMBER[[:blank:]]"

lv4tech · 2009-05-17 18:19:55 8
Alternative way to get the root directory size in megabytes
This is sample output - yours may be different.
-1

expr $(fdisk -s ` grep ' / ' /etc/mtab |cut -d " " -f1`) / 1024

ncaio · 2009-05-21 17:25:38 6
Show display type
This is sample output - yours may be different.
-1

ioreg -lw0 | grep IODisplayEDID | sed "/[^<]*</s///" | xxd -p -r | strings -6

unixmonkey4003 · 2009-05-29 18:52:12 4
Uninstall all MacPorts that are no longer active
This is sample output - yours may be different.
-1

sudo port installed | grep -v 'active\|The' | xargs sudo port uninstall

letterj · 2009-07-09 05:15:30 6
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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)

Check if a process is running

Send signal 0 to the process. The return status ($?) can be used to determine if the process is running. 0 if it is, non-zero otherwise.

One-liner to generate Self-Signed SSL Certificate+Key without any annoying prompts or CSRs

Handy if you want to quickly generate a self-signed certificate. Also can be used in your automated scripts for generating quick-use certificates.

Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

list files recursively by size

calculate md5 sums for every file in a directory tree

an alternative

Making scripts runs on backgourd and logging output

Save all output to a log.

Change your swappiness Ratio under linux

This command allow you to set the swappiness var at 50 (default is 60). The value interval must be set between 0 and 100. If swappiness is high=Swap usage is high, if swappiness is low=Ram usage is high.

Shows cpu load in percent

This version is precise and requires one second to collect statistics. Check sample output for a more generic version and also a remote computer invocation variant. It doesn't work with the busybox version of the 'top' command but can be adjusted

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

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Commands using grep (1,935)

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