Commands using tail sorted by votes

Commands using tail (292)

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Watch PHP log, without knowing it's location (gets from php.ini)

Runs "php -i", filter the error_log location, then watches it using "tail"
This is sample output - yours may be different.
0

tail -v -f $(php -i | grep "^[ \t]*error_log" | awk -F"=>" '{ print $2; }' | sed 's/^[ ]*//g')

paulera · 2016-08-31 12:13:31 25
Use tail -f effectively by omiting unwanted lines containing particular pattern of words using grep -v.

This will be useful when checking for logs and have to omit specific weblogic or apache server's log information which are redundant and unnecessary. Show Sample Output
This is sample output - yours may be different.
```
[surya@suryalinux work]$ tail -f test | grep -v "bea"
19-07-2015
radar
liril
mayam
kayak

h4CkR
summa
sdlfjsk
```
0

tail -f test | grep -v "bea"

suryadavinci · 2016-10-28 21:05:42 17
Get newest Nmap source code tarball URL.
This is sample output - yours may be different.
0

curl -Ls https://nmap.org/dist/ | sed -En '/nmap.*tgz/s@^.*href="([^"]+)".*$@https://nmap.org/dist/\1@p' | tail -n1

akanehara · 2017-02-10 05:46:27 20
Execute the last line of output from the previous command

alex@alex-box:~$ sl The program 'sl' is currently not installed. You can install it by typing: sudo apt-get install sl alex@alex-box:~$ dolast Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: sl 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
This is sample output - yours may be different.
0

alias dolast='$( $(history 2| head -n 1| sed "s/.* //") 2>&1 | tail -n 1)'

aheinous · 2017-02-25 01:26:49 19
Install the suggested package when command not found or installed

Command #If not installed suggest a package. 2>&1 #Send stderr to stdout, for tail can read it tail -1 #Show last line. `Comand` #execute output of command. Show Sample Output
This is sample output - yours may be different.
```
>scribus 2>&1
El programa ?scribus? no est? instalado. Puede instalarlo escribiendo:
sudo apt-get install scribus

>`scribus 2>&1|tail -1`
[sudo] password for user: 
```
0

`command 2>&1|tail -1`

Wallebot · 2017-02-27 18:07:04 18
Colorized tail using sed

Tails make.out file and pipes it to sed which uses 3 colors: green: percentage (eg: 10%) yellow: warning (case insensitive) red: error (case insensitive)
This is sample output - yours may be different.
0

tail -f ~/make.out | sed -e 's/$...%$/\o033[32m\1\o033[39m/' -e 's/$.*[Ww][Aa][Rr][Nn][Ii][Nn][Gg].*$/\o033[33m\1\o033[39m/' -e 's/$.*[Ee][Rr][Rr][Oo][Rr].*$/\o033[31m\1\o033[39m/'

redowk · 2017-03-06 18:20:36 18
Keep the last 10 moodle backups
This is sample output - yours may be different.
0

ls -t /mcdata/archive/learn/backup-moodle2-course-* | tail -n +11 | xargs -I {} rm {}

tlezotte · 2017-05-04 13:50:02 17
pipe remote log web server file to lostalgia

logstalgia must be installed
This is sample output - yours may be different.
0

ssh -n user@server.tr tail -f /usr/local/nginx/logs/access.log > /tmp/access | tail -f /tmp/access | logstalgia

aysadk · 2017-08-19 16:55:09 17
Grep live log tailing
This is sample output - yours may be different.
0

tail -f some_log_file.log | grep --line-buffered the_thing_i_want

Trindaz · 2018-01-11 20:59:03 22
Grep live log tailing
This is sample output - yours may be different.
0

tail -f some_log_file.log | grep the_thing_i_want

bugmenot · 2018-01-21 01:27:56 24
Grep live log tailing, tracks file open/close

"-F" will continue tailing if file is closed and another file opened with same name. This is handy for tailing log files that segment while watching them without having to issue the command again.
This is sample output - yours may be different.
0

tail -F some_log_file.log | grep the_thing_i_want

stinkerweed999 · 2018-01-23 23:21:23 24
Grep live log tailing
This is sample output - yours may be different.
0

tail -F some_log_file.log | grep --line-buffered the_thing_i_want

brx75x · 2018-01-24 09:54:36 47
check squid logs for time value greater than 9000ms
This is sample output - yours may be different.
0

cat squid.log| awk -v x=9000 '$2 >=x' | sort -hs| tail -n 100

calicowboy54 · 2018-04-11 21:04:20 148
Determines latest pdf file downloaded by firefox in ~/Downloads directory
This is sample output - yours may be different.
0

ls -tr ~/Downloads/*.pdf|tail -1

masroor · 2018-05-14 14:01:55 157
Block all brute force attacks in realtime (IPv4/SSH)

Was to long with a loop, use a while loop for have it running 24/7
This is sample output - yours may be different.
0

inotifywait -r -q --format %w /var/log/auth.log|grep -i "Failed pass"|tail -n 1|grep -oE '\b([0-9]{1,3}\.){3}[0-9]{1,3}';iptables -I INPUT -i eth0 -s "$(cat /var/log/auth.log|grep "authentication failure; l"|awk -Frhost= '{print $2}'|tail -n 1)" -j DROP

wuseman1 · 2019-07-28 18:42:23 57
removing those pesky malformed lines at the end of a text file..

tells you the number of lines in said file, and then tail the last 100 lines ( or how many are messed up) then u take the total amount of lines and then subract the 100 or so lines u DONT WANT, then do a head -n $new_number and then redirect it to new file.db
This is sample output - yours may be different.
-1

cat -n $file | tail -n 100 && head -n number-of-lines-you-want-to-keep > newfile

bbelt16ag · 2009-02-15 01:02:10 9
How far is Mac OS X 10.6 from 64-bit?

Next time you see a mac fanboy bragging about 64-bitness of 10.6 give him this so he might sh? Show Sample Output
This is sample output - yours may be different.
```
   127	Mach-O 64-bit kext bundle x86_64
   314	Mach-O object i386
```
-1

file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -i x86_64 |nl |tail -1 |cut -f1 -f3 && file /System/Library/Extensions/*.kext/Contents/MacOS/* |grep -v x86_64 |nl |tail -1 |cut -f1 -f3

commandlinefu · 2009-09-03 14:28:02 6
get Hong Kong weather infomation from HK Observatory

"get Hong Kong weather infomation from HK Observatory From Hong Kong Observatory wap site ;)" other one showed alot of blank lines for me Show Sample Output
This is sample output - yours may be different.
```
HK Observatory
At 10 AM
29'C,75%
UV Index: 4
```
-1

wget -q -O - 'http://wap.weather.gov.hk/' | sed -r 's/<[^>]+>//g;/^UV/q' | tail -n4

dakunesu · 2009-09-25 02:36:46 3
Print just line 4 from a textfile

using tail first won't do it because tail counts from the bottom of the file. You could do it this way but I don't suggest it
This is sample output - yours may be different.
-1

head -n X | tail -n 1

infinull · 2010-07-08 22:06:39 4
tail all logs opened by all java processes

Tail all logs that are opened by all java processes. This is helpful when you are on a new environment and you do not know where the logs are located. Instead of java you can put any process name. This command does work only for Linux. The list of all log files opened by java process: sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'
This is sample output - yours may be different.
-1

sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'|xargs -r tail -f

vutcovici · 2010-07-30 18:20:00 3
Fetch current song from last.fm
This is sample output - yours may be different.
-1

curl -s http://www.last.fm/user/$LASTFMUSER | grep -A 1 subjectCell | sed -e 's#<[^>]*>##g' | head -n2 | tail -n1 | sed 's/^[[:space:]]*//g'

sn0opy · 2011-01-24 08:16:48 3
Find artist and title of a music cd, UPC code given (first result only)

Substitute that 724349691704 with an UPC of a CD you have at hand, and (hopefully) this oneliner should return the $Artist - $Title, querying discogs.com. Yes, I know, all that head/tail/grep crap can be improved with a single sed command, feel free to send "patches" :D Enjoy! Show Sample Output
This is sample output - yours may be different.
```
Iron Maiden - Killers
```
-1

wget http://www.discogs.com/search?q=724349691704 -O foobar &> /dev/null ; grep \/release\/ foobar | head -2 | tail -1 | sed -e 's/^<div>.*>$.*$<\/a><\/div>/\1/' ; rm foobar

TetsuyO · 2011-01-30 23:34:54 3
Display CPU usage in percentage
This is sample output - yours may be different.
-1

ps aux | awk {'sum+=$3;print sum'} | tail -n 1

tailot · 2011-07-16 16:16:59 3
change dir to n-th dir that you listed

Replace the head -1 with head -n that is the n-th item you want to go to. Replace the head with tail, go to the last dir you listed. You also can change the parameters of ls.
This is sample output - yours may be different.
-1

cd $(ls -ltr|grep ^d|head -1|sed 's:.*\ ::g'|tail -1)

timothyhmchen101 · 2011-08-10 03:39:35 2
Hunt for the newest file.

Sort by time and Reverse to get Ascending order, then display a marker next to the a file, negate directory and select only 1 result Show Sample Output
This is sample output - yours may be different.
```
$ ls -trF | grep -v \/ | tail -n 1
ramonroche.sh*
```
-1

ls -trF | grep -v \/ | tail -n 1

mrpollo · 2011-09-14 20:05:37 4
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Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Clean up poorly named TV shows.

Replace 'SHOWNAME' with the name of the TV show. Add -n to test the command without renaming files. Check the 'sample output'.

a function to find the fastest free DNS server

Uses GNU Parallel.

On Screen micro display for battery and CPU temperature. nifty, small, omnipresent

My firefox overheats my cpu, sometimes above 90 degrees Celsius ( hence the name? ) To keep an eye on temperature, I put this command inside KAlarm ( a kind of cron) to be repeated every minute, for 5 seconds, color red ( default for osd_cat). Its pretty, ultra small, displays a micro 2 lines text on every desktop and over everything and do not steal focus or interrupt any task. I get the information passively, in the low profile bottom of the screen. Of course you can use it inside a terminal. Just do it: watch -n 60 'acpi -t | osd_cat -p bottom'

Protect directory from an overzealous rm -rf *

-R Recursively change attributes of directories and their contents. +i to set the immutable bit to prevent even root from erasing or changing the contents of a file.

Filter the output of a file continously using tail and grep

The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.

Display the standard deviation of a column of numbers with awk

This will calculate a running standard deviation in one pass and should never have the possibility for overflow that can happen with other implementations. I suppose there is a potential for underflow in the corner case where the deltas are small or the values themselves are small.

SVN script for automatically adding and deleting files

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 tail (292)

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