Commands using tail sorted by votes

Commands using tail (292)

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List the CPU model name

Information for only one core. Show Sample Output
This is sample output - yours may be different.
```
model name	: AMD Phenom(tm) II X4 965 Processor
cpu MHz		: 3400.000
```
1

grep 'model\|MHz' /proc/cpuinfo |tail -n 2

schmiddim · 2010-11-14 20:32:27 4
Anti DDOS

Takes IP from web logs and pipes to iptables, use grep to white list IPs.. use if a particular file is getting requested by many different addresses. Sure, its already down pipe and you bandwidth may suffer but that isnt the concern. This one liner saved me from all the traffic hitting the server a second time, reconfigure your system so your system will work like blog-post-1.php or the similar so legitimate users can continue working while the botnet kills itself.
This is sample output - yours may be different.
1

tail -f /var/www/logs/domain.com.log | grep "POST /scripts/blog-post.php" | grep -v 192.168. | awk '{print $1}' | xargs -I{} iptables -I DDOS -s {} -j DROP

tehusr · 2010-11-30 06:22:18 5
get the oldest file in a directory

reverse the sorting of ls to get the newest file: ls -1tr --group-directories-first /path/to/dir/ | tail -n 1 Problems: If there are no files in the directory you will get a directory or nothing.
This is sample output - yours may be different.
1

ls -1t --group-directories-first /path/to/dir/ | tail -n 1

fpunktk · 2010-12-02 12:25:16 4
List 10 largest directories in current directory

du -m option to not go across mounts (you usually want to run that command to find what to destroy in that partition) -a option to also list . files -k to display in kilobytes sort -n to sort in numerical order, biggest files last tail -10 to only display biggest 10
This is sample output - yours may be different.
1

du . -mak|sort -n|tail -10

georgesdev · 2010-12-03 19:28:55 2
zsh suffix to inform you about long command ending

make, find and a lot of other programs can take a lot of time. And can do not. Supppose you write a long, complicated command and wonder if it will be done in 3 seconds or 20 minutes. Just add "R" (without quotes) suffix to it and you can do other things: zsh will inform you when you can see the results. You can replace zenity with other X Window dialogs program.
This is sample output - yours may be different.
1

alias -g R=' &; jobs | tail -1 | read A0 A1 A2 cmd; echo "running $cmd"; fg "$cmd"; zenity --info --text "$cmd done"; unset A0 A1 A2 cmd'

pipeliner · 2010-12-13 17:44:36 2
Do one ping to a URL, I use this in a MRTG gauge graph to monitor connectivity
This is sample output - yours may be different.
1

ping -q -c 1 www.google.com|tail -1|cut -d/ -f5

LrdShaper · 2010-12-15 10:36:17 3
make computer speaking to you :)

you can listen to your computer, but don't be carried away
This is sample output - yours may be different.
1

tail -f /var/log/messages | espeak

dmytrish · 2011-04-08 10:24:49 3
Create a bash script from last n commands

Uses history to get the last n+1 commands (since this command will appear as the most recent), then strips out the line number and this command using sed, and appends the commands to a file.
This is sample output - yours may be different.
1

history | tail -(n+1) | head -(n) | sed 's/^[0-9 ]\{7\}//' >> ~/script.sh

unixmonkey15842 · 2011-06-08 13:40:58 3
show each new entry in system messages as a popup

It willl popup a message for each new entry in /var/log/messages found on the notify-send howto page on ubuntuforums.org. Posted here only because it is one of the favourites of mine.
This is sample output - yours may be different.
1

tail -n0 -f /var/log/messages | while read line; do notify-send "System Message" "$line"; done

hukketto · 2011-07-11 22:33:24 3
Download last file from index of
This is sample output - yours may be different.
1

NAME=`wget --quiet URL -O - | grep util-vserver | tail -n 1 | sed 's|</a>.*||;s/.*>//'`; wget URL$UTILVSERVER;

WMP · 2011-07-17 13:01:20 4
Decrypt MD5

Decrypt MD5 , replace 1cb251ec0d568de6a929b520c4aed8d1 with the MD5 string you want to decrypt Show Sample Output
This is sample output - yours may be different.
```
text
```
1

wget -qO - --post-data "data[Row][cripted]=1cb251ec0d568de6a929b520c4aed8d1" http://md5-decrypter.com/ | grep -A1 "Decrypted text" | tail -n1 | cut -d '"' -f3 | sed 's/>//g; s/<\/b//g'

samhagin · 2011-10-13 03:48:54 3
Get top N files in X directory

You can simply run "largest", and list the top 10 files/directories in ./, or you can pass two parameters, the first being the directory, the 2nd being the limit of files to display. Best off putting this in your bashrc or bash_profile file Show Sample Output
This is sample output - yours may be different.
```
$ largest
Getting top 10 largest files in ./
711M	./Havoc.2005.UNRATED.DVDRip.XviD-PuRE
719M	./Lincoln 2012
799M	./[ www.UsaBit.com ] - Here Comes the Boom (2012) BluRay 720p 800MB Ganool.mkv
950M	./Watchmen
1.2G	./Sucker Punch
1.4G	./The Buried Life
1.4G	./Stop-Loss
2.5G	./Django Unchained 2012 DVDSCR X264 AAC-P2P
 14G	./Justified Season 2 Complete 720p
 15G	./Justified Season 1 Completed 720p
```
1

largest() { dir=${1:-"./"}; count=${2:-"10"}; echo "Getting top $count largest files in $dir"; du -sx "$dir/"* | sort -nk 1 | tail -n $count | cut -f2 | xargs -I file du -shx file; }

jhyland87 · 2013-01-21 09:45:21 7
Find top 5 big files

zsh: list of files sorted by size, greater than 100mb, head the top 5. '**/*' is recursive, and the glob qualifiers provide '.' = regular file, 'L' size, which is followed by 'm' = 'megabyte', and finally '+100' = a value of 100
This is sample output - yours may be different.
1

ls -Sh **/*(.Lm+100) | tail -5

khayyam · 2013-03-21 20:22:11 4
Get IP address from domain

I'm not sure how reliable this command is, but it works for my needs. Here's also a variant using grep. nslookup www.example.com | grep "^Address: " | awk '{print $2}' Show Sample Output
This is sample output - yours may be different.
```
123.123.123.123
```
1

nslookup www.example.com | tail -2 | head -1 | awk '{print $2}'

wsams · 2013-09-05 20:26:45 11
mean color of an image

You can get the mean value for the colours in an image. Then you can determine, in general, how dark or bright is the image and run some other actions based on that. I'll recommend to readjust the brightness of the images using +sigmoidal-contrast option of imagemagick convert command. Show Sample Output
This is sample output - yours may be different.
```
105
```
1

convert image.jpg -resize 1x1 txt: | tail -1 | awk '{gsub(/[,\)]/," "); print $3+$4+$5}'

sucotronic · 2013-12-11 09:13:00 10
Find the date of the first commit in a git repository

Finds the date of the first commit in a git repository branch Show Sample Output
This is sample output - yours may be different.
```
Wed Jun 25
```
1

git rev-list --all|tail -n1|xargs git show|grep -v diff|head -n1|cut -f1-3 -d' '

binaryten · 2015-02-04 19:35:16 11
Delete specific sender in mailq
This is sample output - yours may be different.
1

postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } / user@example\.com/ { print $1 }' | tr -d '*!' | postsuper -d -

fromthestone · 2015-02-12 01:01:59 8
Stores the certificate expiration date on the variable A

Stores the certificate expiration date on the variable A Show Sample Output
This is sample output - yours may be different.
```
May 20 2015
```
1

echo | openssl s_client -connect www.batatinha.com.br:443 2>/dev/null | openssl x509 -noout -dates | tail -1 | tr -s " " |cut -d "=" -f2 | cut -d " " -f1,2,4

alissonf · 2015-03-09 17:17:46 8
print/scan lines starting at record ###

Useful for finding newly added lines to a file, tail + can be used to show only the lines starting at some offset. A syslog scanner would look at the file for the first time, then record the end_of_file record number using wc -l. Later (hours, days), scan only at the lines that were added since the last scan. Show Sample Output
This is sample output - yours may be different.
```
MYFILE=/var/log/messages
EOF=$(wc -l < $MYFILE)

...time passes...
tail +$($EOF+1) $MYFILE
```
1

tail +### MYFILE

pooderbill · 2015-04-23 11:49:15 14
Recursively find disk usage, sort, and make human readable (for systems without human-readable sort command)

Recursively find disk usage, sort, and make human readable: * For systems without human-readable sort command * awk, not perl Show Sample Output
This is sample output - yours may be different.
```
   3.148 MB	 ./arch/cris/include
   3.426 MB	 ./arch/cris
   3.539 MB	 ./arch/blackfin
   4.539 MB	 ./arch/mips/include/asm
   4.543 MB	 ./arch/mips/include
   5.398 MB	 ./arch/mips
   9.543 MB	 ./drivers
  11.230 MB	 ./arch/arm
  13.852 MB	 ./include/linux
  21.820 MB	 ./include
  46.758 MB	 ./arch
  84.902 MB	 .
```
1

du -x ${SYMLINKS} -k "$@" | sort -n | tail -100 | awk 'BEGIN { logx = log(1024); size[0]= "KB"; size[1]= "MB"; size[2]= "GB"; size[3]= "TB" } { x = $1; $1 = ""; v = int(log(x)/logx); printf ("%8.3f %s\t%s\n",x/(1024^v), size[v], $0) }'

dpanofsky · 2015-08-27 23:16:25 98
Grab the top 5 CLFUContest one-liners
This is sample output - yours may be different.
1

curl -sL http://goo.gl/3sA3iW | head -16 | tail -14

cadejscroggins · 2015-09-19 07:19:49 10
Pulse Volume Control Using Zenity

This produces a little bar that you can use to set the volume percentage.
This is sample output - yours may be different.
1

amixer -D pulse sset Master $(zenity --scale --text="Select a number" --value=$(amixer -D pulse sget Master | grep -Eo '..[0-9]'% | tr -d '%[, ' | tail -n 1) --min-value="0" --max-value="100" --step="1")%

lowrez · 2016-01-02 03:20:41 10
Find the package that installed a command

Put this one-line function somewhere in your shell init, re-login and try whatinstalled <command> This is an elaborate wrapper around "dpkg -S", with numerous safeguards. Symlinks and command aliases are resolved. If the searched command is not an existing executable file or was installed by some other means than dpkg/apt, nothing is printed to stdout, otherwise the package name. Show Sample Output
This is sample output - yours may be different.
```
$ whatinstalled ls  
coreutils

$ whatinstalled update-grub      
grub2-common
```
1

whatinstalled () { local cmdpath=$(realpath -eP $(which -a $1 | grep -E "^/" | tail -n 1) 2>/dev/null) && [ -x "$cmdpath" ] && dpkg -S $cmdpath 2>/dev/null | grep -E ": $cmdpath\$" | cut -d ":" -f 1; }

lordtoran · 2016-11-08 16:13:10 20
Image to color palette generator

Extract a color palette from a image useful for designers. Example usage: extract-palette myawesomeimage.jpg 4 Where the first argument is the image you want to extract a palette from. The second argument is the number of colors you want. It may be the case where you want to change the search space. In that case, change the -resize argument to a bigger or smaller result. See the ImageMagick documentation for the -resize argument. Show Sample Output
This is sample output - yours may be different.
```
#0F0E17
#60579D
#9D6E97
#E99B75
#C57D8F
#D89690
#AA736B
#4D3B3F
```
1

extract-palette() { convert "$1" -resize 300x -dither None -colors "$2" txt: | tail -n +2 | tr -s ' ' | cut -d ' ' -f 3 | sort | uniq -c | sort -rn | tr -s ' ' | cut -d ' ' -f 3;}

seabre · 2017-06-21 22:07:26 51
Display the end of a logfile as new lines are added to the end
This is sample output - yours may be different.
1

tail -f logfile

captainbal00 · 2018-12-14 18:40:47 31
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list files recursively by size

Create the four oauth keys required for a Twitter stream feed

Twitter stream feeds now require authentication. This command is the FIRST in a set of five commands you'll need to get Twitter authorization for your final Twitter command. *** IMPORTANT *** Before you start, you have to get some authorization info for your "app" from Twitter. Carefully follow the instructions below: Go to dev.twitter.com/apps and choose "Create a new application". Fill in the form. You can pick any name for your app. After submitting, click on "Create my access token". Keep the resulting page open, as you'll need information from it below. If you closed the page, or want to get back to it in the future, just go to dev.twitter.com/apps Now customize FIVE THINGS on the command line as follows: 1. Replace the string "Consumer key" by copying & pasting your custom consumer key from the Twitter apps page. 2. Replace the string "Consumer secret" by copying & pasting your consumer secret from the Twitter apps page. 3. Replace the string "Access token" by copying & pasting your access token from the Twitter apps page. 4. Replace string "Access token secret" by copying & pasting your own token secret from the Twitter apps page. 5. Replace the string 19258798 with the Twitter UserID NUMBER (this is **NOT** the normal Twitter NAME of the user you want the tweet feed from. If you don't know the UserID number, head over to www.idfromuser.com and type in the user's regular Twitter name. The site will return their Twitter UserID number to you. 19258798 is the Twitter UserID for commandlinefu, so if you don't change that, you'll receive commandlinefu tweets, uhm... on the commandline :) Congratulations! You're done creating all the keys! Environment variables k1, k2, k3, and k4 now hold the four Twitter keys you will need for your next step. The variables should really have been named better, e.g. "Consumer_key", but in later commands the 256-character limit forced me to use short, unclear names here. Just remember k stands for "key". Again, remember, you can always review your requested Twitter keys at dev.twitter.com/apps. Our command line also creates four additional environment variables that are needed in the oauth process: "once", "ts", "hmac" and "id". "once" is a random number used only once that is part of the oauth procedure. HMAC is the actual key that will be used later for signing the base string. "ts" is a timestamp in the Posix time format. The last variable (id) is the user id number of the Twitter user you want to get feeds from. Note that id is ***NOT*** the twitter name, if you didn't know that, see www.idfromuser.com If you want to learn more about oauth authentication, visit oauth.net and/or go to dev.twitter.com/apps, click on any of your apps and then click on "Oauth tool" Now go look at my next command, i.e. step2, to see what happens next to these eight variables.

Block all IP addresses and domains that have attempted brute force SSH login to computer

Searches all log files (including archived bzip2 files) for invalid user and PAM authentication errors, both of which are indicative of brute force attempts at logging into computer. A list of all unique IP addresses and domain names is appended to hosts.deny. The command (and grep error messages) will work on Mac OS X 10.6, small adjustments may be needed for other OSs.

Sync the date of one server to that of another.

(Useful when firewalls prevent you from using NTP.)

Wait for an already launched program to stop before starting a new command.

Referring to the original post, if you are using $! then that means the process is a child of the current shell, so you can just use `wait $!`. If you are trying to wait for a process created outside of the current shell, then the loop on `kill -0 $PID` is good; although, you can't get the exit status of the process.

Grab just the title of a youtube video

There's another version on here that uses GET but some people don't have lwp-request, so here's an alternative. It's also a little shorter and should work with most youtube URLs since it truncates at the first &

Twitpic upload and Tweet

kill process by name

Or even easier, if it's available: $ killall firefox I have no idea why you would want to rely on two unusual dependencies to do something that can be done a hundred ways from coreutils...

Query Wikipedia via console over DNS

Shorter version, works with multiple words.

Adding Prefix to File name

Good old bracket expansion :-) For large numbers of files, "rename" will spare you the for-loop, or the find/exec...

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Commands using tail (292)

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