Commands using tail (292)
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The same with colors
0tail -f /var/log/squid/access.loc | ccze -CA -
Count and Find all IP connected to my host through TCP connection. Show Sample Output
0netstat -an |grep ":80" |awk '{print $5}' | sed s/::ffff://g | cut -d: -f1 |sort |uniq -c |sort -n | tail -1000 | grep -v "0.0.0.0" -
0sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep udp && echo && sudo netstat|head -n2|tail -n1 && sudo netstat -a|grep tcp
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0fn=$(find . -type f -printf "%T@\t%p\n"|sort -n|tail -1|cut -f2); echo $(date -r "$fn") "$fn"
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say only processes a complete file, at eof, so following a file isn't possible. Quick and dirty perl oneliner to feed each line from the tail -f to say. Yes, expensive to lauch a new process each line. This little ditty was prompted by a discussion on how horrible it is to use VoiceOver on ncurses programs such as irssi.
0tail -f LOGFILE | perl -ne '`say "$_"`;' -
Maybe very limited in its applicability but could be of use at times. Show Sample Output
0diff -U 9999 file_a file_b | tail -n +3 | grep -P "^(\ Header|\-|\+)" -
after kernel build with make deb-pkg, I like to install the 4 newest packages that exist in the directory. Beware: might be fewer for you....
0sudo dpkg -i `ls -tr *.deb | tail -n4` -
Encrypt any text to MD5 , replace text with the string you want to convert to MD5 Show Sample Output
0wget -qO - --post-data "data[Row][clear]=text" http://md5-encryption.com | grep -A1 "Md5 encrypted state" | tail -n1 | cut -d '"' -f3 | sed 's/>//g; s/<\/b//g' -
new way to replace text file with dd,faster than head,sed,awk if you do this with big file Show Sample Output
0:|dd of=./ssss.txt seek=1 bs=$(($(stat -c%s ./ssss.txt)-$(tail -n 2 ./ssss.txt|wc -c))) -
This shell function uses curl(1) as it is more portable than wget(1) across Unices, to show what site a shortened URL is pointing to, even if there are many nested shortened URLs. It is a refinement to www.commandlinefu.com/commands/view/9515/expand-shortened-urls to make it better for use in scripts. Only displays final result.
expandurl http://t.co/LDWqmtDMShow Sample Output0expandurl() { curl -sIL $1 2>&1 | awk '/^Location/ {print $2}' | tail -n1; } -
0ps -p pid -o logname |tail -1
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0find /usr/include/ -name '*.[c|h]pp' -o -name '*.[ch]' -print0 | xargs -0 wc -l | tail -1
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Use the excellent sensiblepasswords.com to a generate random (yet easy-to-remember) password every second, and copy it to the clipboard. Useful for generating a list of passwords and pasting them into a spreadsheet. This script uses "madebynathan"'s "cb" function (http://madebynathan.com/2011/10/04/a-nicer-way-to-use-xclip/); you could also replace "cb" with
xclip -selection cRemove "while true; do" and "; done" to generate and copy only 1 password. Show Sample Output0while true; do curl -s http://sensiblepassword.com/?harder=1 | tail -n 15 | head -n 1 | sed 's;<br/>;;' | cut -c 5- | cb; sleep 1; done -
0TOTAL_RAM=`free | head -n 2 | tail -n 1 | awk '{ print $2 }'`; PROC_RSS=`ps axo rss,comm | grep [h]ttpd | awk '{ TOTAL += $1 } END { print TOTAL }'`; PROC_PCT=`echo "scale=4; ( $PROC_RSS/$TOTAL_RAM ) * 100" | bc`; echo "RAM Used by HTTP: $PROC_PCT%"
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0identify image.jpg |grep -o "[[:digit:]]*x[[:digit:]]*" |tail -1
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Commandline perl filter for, using a production.log from a rails app, display on realtime the count of requests grouped by "seconds to complete" (gross round, but fair enough for an oneliner) :) Show Sample Output
0tail -f production.log | perl -ne 'if (/^Completed.in.(\d+)/){$d = int($1/1000);print "\n";$f{$d}++;for $t (sort(keys(%f))){print $t."s: ".$f{$t}."\n"}}' -
0while [ 1 ]; do tail /var/log/httpd/error_log; sleep 2; clear; done
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It will just start playing and will not stop at the point that it has downloaded up to when the video starts
0mplayer <(tail -fc +0 <filename>) -
Realtime lines per second in a log file using python ... identical to perl version, except python is much better :) Show Sample Output
0tail -F /var/log/nginx/access.log | python -c 'exec("import sys,time\nl=0\ne=int(time.time())\nfor line in sys.stdin:\n\tt = int(time.time())\n\tl += 1\n\tif t > e:\n\t\te = t\n\t\tprint l\n\t\tl = 0")' -
Great easy way to look at line rates for your server Good to 30k-60k Lines Per second. Show Sample Output
0tail -F /var/log/apache2/access.log | pv -N RAW -lc 1>/dev/null -
0ls -l| sort +4n|tail -1| awk '{print $NF}'
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Watch out if you have several USB drives plugged in: it scans the whole /media/ folder !!! You can replace /media/ by the path of a specific USB drive (something like /media/F77A-530B/) I use a sound recorder and I want to plug the recorder and grab the most recent sound. That's what this command does. Use mv instead of cp to move instead of copy. Change *.wav to the required file type.
0cp $(find /media/ -type f -name "*.wav" -printf "%T@ %h/%f\n" | sort | tail -1 | awk '{ print $2 }') . -
0amixer -c 0 set Master toggle | tail -1 | awk '{print $4}' | sed "s/[^0-9]//g" ; amixer -c 0 set Speaker toggle >/dev/null; amixer -c 0 set Front toggle >/dev/null
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0find . -name "fullcalib4.csv" -exec tail -n1 \{\} \; >>all.csv
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0systemctl --failed | head -n -6 | tail -n -1
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