Commands using head (314)
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This command is similar to the alternate, except with head(1), you can pick as many passwords as you wish to generate by changing the number of lines you wish to preview. Show Sample Output
2strings /dev/urandom | tr -cd '[:alnum:]' | fold -w 30 | head -n 1 -
2ls -l | head -n 65535 | awk '{if (NR > 1) total += $5} END {print total/(1024*1024*1024)}'
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2ps -auxf | sort -nr -k 4 | head -10
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shell generate random strong password Show Sample Output
2len=20; tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${len} | xargs -
Top 10 Memory Processes (reduced output to applications and %usage only) Show Sample Output
2ps aux | sort -rk 4,4 | head -n 10 | awk '{print $4,$11}' -
2time seq 65535 | parallel -k --joblog portscan -j9 --pipe --cat -j200% -n9000 --tagstring '\033[30;3{=$_=++$::color%8=}m' 'nc -vz localhost $(head -n1 {})-$(tail -n1 {})'
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Must be done as root - will cause subsequent ssh connections to use the identities available via the [user]'s agent socket. Show Sample Output
1export SSH_AUTH_SOCK=`find /tmp/ssh* -type s -user [user] -mtime -1 | head -1` -
Usage: Declare this function in your Shell, then use it like this:
> jumpTo fooThe script will search for the 'foo' pattern in your current xmms2 playlist (artist or songname), and play the first occurence of it !1function jumpTo { xmms2 jump `xmms2 list | grep -i '$1' | head -n 1 | tail -n 1 | sed -re 's@.+\[(.+)/.+\] (.+)@\1@'`; } -
This works on my ubuntu/debian machines. I suspect other distros need some tweaking of sort and cut. I am sure someone could provide a shorter/faster version.
1find / \( -name "*.log" -o -name "*.mylogs" \) -exec ls -lrt {} \; | sort -k6,8 | head -n1 | cut -d" " -f8- | tr -d '\n' | xargs -0 rm -
Skype has an internal regex which depicts the emoticons it supports. However you cannot simply search the binary file for it. This small 181 character line will do just that, provided skype is running. And of course, only works in linux. Show Sample Output
1S=`pidof skype`;grep heap /proc/$S/maps|cut -f1 -d' '|awk -F- '{print "0x" $1 " 0x" $2}'|xargs echo "du me t ">l;gdb -batch -p $S -x l>/dev/null 2>&1;strings t|grep \(smirk|head -n1 -
1ps -eo pcpu,user,pid,cmd | sort -r | head -5
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Works recusivley in the specified dir or '.' if none given. Repeatedly calls 'find' to find a newer file, when no newer files exist you have the newest. In this case 'newest' means most recently modified. To find the most recently created change -newer to -cnewer. Show Sample Output
1newest () { DIR=${1:-'.'}; CANDIDATE=`find $DIR -type f|head -n1`; while [[ ! -z $CANDIDATE ]]; do BEST=$CANDIDATE; CANDIDATE=`find $DIR -newer "$BEST" -type f|head -n1`; done; echo "$BEST"; } -
1cut -d\ -f 1 ~/.bash_history | sort | uniq -c | sort -rn | head -n 10 | sed 's/.*/ &/g'
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I'm not sure why you would want to do this, but this seems a lot simpler (easier to understand) than the version someone submitted using awk.
1man $(ls /bin | shuf | head -1) -
1wget http://forums.dropbox.com && wget $(cat index.html|grep "Latest Forum Build"|cut -d"\"" -f2) && wget $(cat topic.php*|grep "Linux x86:"|cut -d"\"" -f2|sort -r|head -n1) && rm -rf ~/.dropbox* && rm index.html *.php* && tar zxvf dropbox-*.tar.gz -C ~/
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1tr -cd '[:alnum:]' < /dev/urandom | fold -w30 | head -n1
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1ps ax -L -o pid,tid,psr,pcpu,args | sort -nr -k4| head -15 | cut -c 1-90
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1echo `cat /dev/urandom |tr -dc "[:alnum:]" | head -c64`
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1seq -w 50 | sort -R | head -6 |fmt|tr " " "-"
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1ls -S|head -1find
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Uses history to get the last n+1 commands (since this command will appear as the most recent), then strips out the line number and this command using sed, and appends the commands to a file.
1history | tail -(n+1) | head -(n) | sed 's/^[0-9 ]\{7\}//' >> ~/script.sh -
1head /dev/urandom | md5sum | base64
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It grabs the PID's top resource users with $(ps -eo pid,pmem,pcpu| sort -k 3 -r|grep -v PID|head -10) The sort -k is sorting by the third field which would be CPU. Change this to 2 and it will sort accordingly. The rest of the command is just using diff to display the output of 2 commands side-by-side (-y flag) I chose some good ones for ps. pidstat comes with the sysstat package(sar, mpstat, iostat, pidstat) so if you don't have it, you should. I might should take off the timestamp... :| Show Sample Output
1for i in $(ps -eo pid,pmem,pcpu| sort -k 3 -r|grep -v PID|head -10|awk '{print $1}');do diff -yw <(pidstat -p $i|grep -v Linux) <(ps -o euser,pri,psr,pmem,stat -p $i|tail);done -
1sed -e 's/[;|][[:space:]]*/\n/g' .bash_history | cut --delimiter=' ' --fields=1 | sort | uniq --count | sort --numeric-sort --reverse | head --lines=20
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This command will list the PID, VEID, and Name of the 10 highest cpu using processes on a openvz host. You must have vzpid installed. Show Sample Output
1ps -e h -o pid --sort -pcpu | head -10 | vzpid - - ‹ First < 2 3 4 5 6 > Last ›
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