Commands using head (314)
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20characters long alpahnumeric "password" Show Sample Output
-1head -c20 /dev/urandom | xxd -ps -
Fetches latest stable release version from first entry between tags Show Sample Output
-1curl -s -k https://www.kernel.org/feeds/kdist.xml | sed -n -e 's@.*<guid>\(.*\)</guid>.*@\1@p' | grep 'stable' | head -1 | awk -F , '{print $3}' -
-1cat "log" | grep "text to grep" | awk '{print $1}' | sort -n | uniq -c | sort -rn | head -n 100
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-2head -1000 < lines.txt | tail -1
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Replace < pw-length > with the desired password-length. The password-length is not always correct, but wayne...
-2head -c $((<pw-lenght>-2)) /dev/urandom | uuencode -m - | sed -e '1d' -e '3d' | sed -e 's/=.*$//g' -
Does that count as a win for bzip2? Show Sample Output
-2< /dev/urandom tr -dc A-Za-z0-9_ | head -c $((1024 * 1024)) | tee >(gzip -c > out.gz) >(bzip2 -c > out.bz) > /dev/null -
-2echo "12345,12346" |sed -e's/ //'|tr "," "\n"| while read line; do echo -n $line" "; svn log -vr $line https://url/to/svn/repository/|grep "/"|head -1|cut -d"/" -f2; done
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ok I'm sure it's not pretty Show Sample Output
-2lynx -source http://www.commandlinefu.com/commands/random | sed 's/<[^>]*>//g' | head -1037 | tail -10 | sed -e 's/^[ \t]*//' | sed '/^$/d' | head -2 -
Get the line containing "inet addr:" and the line before that, get down to only the first line, and then get the first word on that line, which should be the interface. Show Sample Output
-2ifconfig | grep -B 1 "inet addr:" | head -1 | cut -d" " -f1 -
If a directory name contains space xargs will do the wrong thing. Parallel https://savannah.nongnu.org/projects/parallel/ deals better with that. Show Sample Output
-2du -s * | sort -nr | head | cut -f2 | parallel -k du -sh -
-2/sbin/ifconfig|grep -B 1 inet |head -1 | awk '{print $5}'
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-2feh --bg-center `ls -U1 |sort -R |head -1`
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this will dump a list of domains one per line into a text file
-2curl -s -O http://s3.amazonaws.com/alexa-static/top-1m.csv.zip ; unzip -q -o top-1m.csv.zip top-1m.csv ; head -1000 top-1m.csv | cut -d, -f2 | cut -d/ -f1 > topsites.txt -
-2ls -t1 | head -n1
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Not perfect but working (at least on the project i wrote it ;) ) Specify what you want search in var search, then it grep the folder and show one result at a time. Press enter and then it will show the next result. It can work bad on result in the firsts lines, and it can be improved to allow to come back. But in my case (a large project, i was checking if a value wasn't used withouth is corresponding const and the value is "1000" so there was a lot of result ...) it was perfect ;)
-2search="whatyouwant";data=$(grep "$search" * -R --exclude-dir=.svn -B2 -A2);for((i=$(echo "$data" | wc -l);$i>0;i=$(($i-6)) )); do clear;echo "$data"| tail -n $i | head -n 5; read;done -
wrap it in a function if you like...
lastfile () { ls -ltp | sed '1 d' | head -n1 }Show Sample Output-2ls -ltp | sed '1 d' | head -n1 -
Probably more trouble than its worth, but worked for the obscure need.
-2memnum=$(awk '{ print $2 }' /proc/meminfo |head -n1); echo "$memnum / 1024 / 1024" | bc -l -
Reads n lines from stdin and puts the contents in a variable. Yes, I know the read command and its options, but find this logical even for one line. Show Sample Output
-2VAR=$(head -5) -
Change :alnum: to :graph: for all printable characters Show Sample Output
-2cat /dev/urandom |tr -c -d '[:alnum:]'|head -c 16;echo -
Deletes thousands of files at one go, I'm not able to recall the exact # of files that rm can delete at one go(apprx. around 7000.)
-3rm -rf `ls | head -5000` -
This uses urandom to produce a random password. The random values are uuencoded to ensure only printable characters. This only works for a number of characters between 1 and 60. Show Sample Output
-3mkpasswd() { head -c $(($1)) /dev/urandom | uuencode - | sed -n 's/.//;2s/\(.\{'$1'\}\).*/\1/p' ;} -
-3yes '' | head -n100
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-3echo Selected $(ls -1 | sort -R | head -n 1)
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-3cd $(ls -1t --color=never | head -1)
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Useful for situations where you have word lists or dictionaries that range from hundreds of megabytes to several gigabytes in size. Replace file.lst with your wordlist, replace 50000 with however many lines you want the resulting list to be in total. The result will be redirected to output.txt in the current working directory. It may be helpful to run wc -l file.lst to find out how many lines the word list is first, then divide that in half to figure out what value to put for the head -n part of the command.
-3less file.lst | head -n 50000 > output.txt - ‹ First < 10 11 12 13 >
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