Commands using grep sorted by votes

Commands using grep (1,935)

sorted by

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 04:01:11 502
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 11:50:59 399
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
‹ First < 60 61 62 63 64 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

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)

Periodic Log Deletion

deletes logs not modified in over [#] days - modify to compress or move, as needed

small CPU benchmark with PI, bc and time.

$ # 4 cores with 2500 pi digits $ CPUBENCH 4 2500 $. $ every core will use 100% cpu and you can see how fast they calculate it. $ if you do 50000 digitits and more it can take hours or days

track flights from the command line

Usage: flight_status airline_code flight_number (optional)_offset_of_departure_date_from_today So for instance, to track a flight which departed yesterday, the optional 3rd parameter should have a value of -1. eg. flight_status ua 3655 -1 output --------- Status: Arrived Departure: San Francisco, CA (SFO) Scheduled: 6:30 AM, Jan 3 Takeoff: 7:18 AM, Jan 3 Term-Gate: Term 1 - 32A Arrival: Newark, NJ (EWR) Scheduled: 2:55 PM, Jan 3 At Gate: 3:42 PM, Jan 3 Term-Gate: Term C - C131 Note: html2text needs to be installed for this command. only tested on ubuntu 9.10

Search through files, ignoring .svn

By putting the "-not $ -name .svn -prune $" in the very front of the "find" command, you eliminate the .svn directories in your find command itself. No need to grep them out. You can even create an alias for this command: $ alias svn_find="find . -not $ -name .svn -prune $" Now you can do things like $ svn_find -mtime -3

Automatically tunnel all ports of running docker instances in boot2docker

It requires https://jqplay.org/, that comes with brew: brew install jq

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

Based on capsule8 agent examples, not rigorously tested

Print a list of the 30 last modified mp3s sorted by last first

Access folder "-"

If you try to access cd - you go to the last folder you were in.

Display two calendar months side by side

Displays last month, current month, and next month side by side.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using grep

Commands using grep (1,935) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using grep (1,935)

sorted by