Commands using head (314)
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Find top 5 big files
-3find . -type f -exec ls -s {} \; | sort -n -r | head -5 -
prints a random line
-4head -$(($RANDOM % $(wc -l < file.txt) +1 )) file.txt | tail -1 -
-4shuf file.txt | head -n 1
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-4echo -e "HEAD / HTTP/1.1\nHost: slashdot.org\n\n" | nc slashdot.org 80 | head -n5 | tail -1 | cut -f2 -d-
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This is useful when you got a reserved IP address like 192.168.0.100 and want to find out what IP address is used to access the Internet. You have to know a server with 'efingerd -n' configured, like www.linuxbanks.cn as above. Other method to find out this information are for example access www.tell-my-ip.com and grep the output. The finger method have the advantage that it is easy to deploy a service like www.tell-my-ip.com, as you only need to get efingerd installed.
-4finger @www.linuxbanks.cn | grep -oE '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}' | head -n1 -
Matrix Screen HPUX
-4while :; do integer i=0; COL=$((RANDOM%$(tput cols))); ROW=$((RANDOM%$(tput cols))); while (( i <= COL)) do tput cup $i $ROW; echo "\033[1;34m" $(cat /dev/urandom | head -1 | cut -c1-1) 2>/dev/null; i=$(expr $i + 1); done done -
Get the first IPv4 address of an interface Show Sample Output
-4ip a s eth0 | grep "inet " | head -n 1 | awk '{print $2}' | cut -f1 -d'/' -
-5tail -n +4 | head -n 1
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Silly approach, but easy to remember... Show Sample Output
-5head -n 13 /etc/services | tail -n 1 -
Tail is much faster than sed, awk because it doesn't check for regular expressions. Show Sample Output
-5tail -n +<N> <file> | head -n 1 -
-6head -n 20 <filename> | tail
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You need curl.. and a Mac of course.
-7curl -s -u user:password http://twitter.com/statuses/friends_timeline.rss | grep title | sed -ne 's/<\/*title>//gp' | head -n 4 | say -v Bruce -
tail -n X | head -n 1 prints a specific line, where X is the line number
-7tail -n 4 | head -n 1 -
Work only with bash and apt-file installed. When it found an unknow command, it will search for a file named "scribus" (in my example), in a folder named bin and then install the corresponding package. After installation, it will run the command. Usefull juste after reinstalling linux and missing lot of package. Show Sample Output
-7function command_not_found_handle(){ apt-get install $( apt-file search "$1" | grep bin | grep -w "$1" | head -n1 | cut -d ':' -f 1 ) && $* ; } - ‹ First < 11 12 13
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