Commands using head (314)
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3awk '{print $1}' /var/log/httpd/access_log | sort | uniq -c | sort -rnk1 | head -n 10
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3date +%s | sha256sum | base64 | head -c <length>; echo
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Checks the apache configuration syntax, if is OK then restart the service otherwise opens the configuration file with VIM on the line where the configuration fails.
3( apache2ctl -t && service apache2 restart || (l=$(apache2ctl -t 2>&1|head -n1|sed 's/.*line\s\([0-9]*\).*/\1/'); vim +$l $(locate apache2.conf | head -n1))) -
perl-less way
3(netstat -atn | awk '{printf "%s\n%s\n", $4, $4}' | grep -oE '[0-9]*$'; seq 32768 61000) | sort -n | uniq -u | head -n 1 -
3du -hsx * | sort -rh | head -10
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Short list about top 10 processes, sorted by CPU usage Show Sample Output
3ps aux | sort -rk 3,3 | head -n 10 -
3ps auxk -%cpu | head -n10
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It displays the top 10 processes sorted by memory usage Show Sample Output
3ps aux | sort -rk 4,4 | head -n 10 -
3glxinfo |grep -i -o 'device|memory\|[0-9]\{1,12\} MB'|head -n 1
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2# cut -d ' ' -f1 /var/log/nginx/nginx-access.log | sort | uniq -c | sort -nr | head -10 | nl
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Adjust the
head -cpart for password length. I use filenames like "hans@commandlinefu.com.gpg" and a vim which automatically decrypts files with .gpg suffixes.2tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10 | gpg -e -r medha@nerdish.de > password.gpg -
2ls -t1 | head -n1
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Low on disk space? Check the largest installed RPMs for delete canditates. Show Sample Output
2rpm -qa --qf '%{SIZE} %{NAME}\n' | sort -nr | nl | head -6 # six largest RPMs -
Change ~/tmp to the destination directory, such as your mounted media. Change -n20 to whatever number of files to copy. It should quit when media is full. I use this to put my most recently downloaded podcasts onto my phone.
2find . -name \*.mp3 -printf "%C+ %h/%f\n" | sort -r | head -n20 | awk '{print "\""$2"\""}' | xargs -I {} cp {} ~/tmp -
2sort -R file.txt | head -1
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2mysql -u<user> -p<password> -s -e 'DESCRIBE <table>' <database> | tail -n +1 | awk '{ printf($1",")}' | head -c -1
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2find ~/Music -daystart -mtime -60 -name *mp3 -printf "%T@\t%p\n" | sort -f -r | head -n 30 | cut -f 2
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2head -c4 /dev/urandom | od -N4 -tu4 | sed -ne '1s/.* //p'
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2tr -c -d 0-9 < /dev/urandom | head -c 10
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Same as original, but works in bash
2while [ 1 -lt 2 ]; do i=0; COL=$((RANDOM%$(tput cols)));ROW=$((RANDOM%$(tput cols)));while [ $i -lt $COL ]; do tput cup $i $ROW;echo -e "\033[1;34m" $(cat /dev/urandom | head -1 | cut -c1-1) 2>/dev/null ; i=$(expr $i + 1); done; done -
Just increase the 1 at the end if you want to generate more than one. (Alternative to "| head -n N" you could use the -b flag of od: -b $[6*N] Show Sample Output
2od /dev/urandom -w6 -tx1 -An|sed -e 's/ //' -e 's/ /:/g'|head -n 1 -
2alias cd1='cd $( ls -lt | grep ^d | head -1 | cut -b 51- )'
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Specify the size in bytes using the 'c' option for the -size flag. The + sign reads as "bigger than". Then execute du on the list; sort in reverse mode and show the first 10 occurrences. Show Sample Output
2find /myfs -size +209715200c -exec du -m {} \; |sort -nr |head -10 -
combination of several of the above
2export GREP_COLOR='1;32';while [ true ]; do head -n 100 /dev/urandom; sleep .1; done | hexdump -C | grep --color=auto "ca fe" -
list the top 15 folders by decreasing size in MB Show Sample Output
2du -xB M --max-depth=2 /var | sort -rn | head -n 15 - < 1 2 3 4 5 > Last ›
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