Commands using tail sorted by votes

Commands using tail (292)

sorted by

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
‹ First < 3 4 5 6 7 > 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

Check for Firewall Blockage.

This is just one method of checking to see if an IP is blocked via IP tables or CSF. Simple and to the point. Replace xx.xx.xx.xx with the IP you wish to check.

Coping files, excluding certain files

Preserve file structure when coping and exclude some file o dir patterns

Simple addicting bash game.

Really bored during class so I made this... Basically, you hold period (or whatever) and hit enter after a second and you need to make the next line of periods the same length as the previous line... My record was 5 lines of the same length. It's best if you do it one handed with your pointer on period and ring on enter.

Run netcat to server files of current folder

list block devices

Shows all block devices in a tree with descruptions of what they are.

List your largest installed packages (on Debian/Ubuntu)

sort the contents of a text file in place.

sorts the contents of a file without the need for a second file to take the sorted output. This was previously entered as `sort -g list.txt -o $_` but as others have pointed out the $_ references the previous command. so this would've worked had that been the second part of a command joined with && like: cat list.txt && sort -g list.txt -o $_ The user below me Robin had the most correct command.

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" }

Display current bandwidth statistics

ifstat, part of ifstat package, is a tool for displaying bandwidth and other statistics. The -n option avoid to display header periodically, the -t option put a timestamp at the beginning of the line. Works for me on Debian and CentOS

Check to make sure the whois nameservers match the nameserver records from the nameservers themselves

Change the $domain variable to whichever domain you wish to query. Works with the majority of whois info; for some that won't, you may have to compromise: domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a

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 tail

Commands using tail (292) 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 tail (292)

sorted by