LinuxShort
From MediaWiki
Usefull short commands
- kill a process tree
When some script is started from a command line in a for-loop and a process tree is made, one should find the parent process and its PID and then simply kill it:
$ pstree username -p sshd(19953)---bash(19954)---bash(22238)---idl(22323)-+-{idl}(22326) |-{idl}(22327) |-{idl}(22328) `-{idl}(22329) sshd(20096)---bash(20097) sshd(20762)---bash(20763) sshd(21087)---bash(21088)-+-grep(21309) `-top(21308) sshd(21736)---bash(21737) sshd(21780)---bash(21781)---pstree(22331)
Or if this tree is to long, one should grep the program (here:idl) with: $ pstree usrname -p | grep idl
$ kill 19953 $ pstree username -p sshd(20096)---bash(20097) sshd(20762)---bash(20763) sshd(21087)---bash(21088)-+-grep(21309) `-top(21308) sshd(21736)---bash(21737) sshd(21780)---bash(21781)---pstree(22332)
- Change sth inside file
sed -i s/'\-9999'/'NaN'/g filename
This will change -9999 with NaN inside a file, without making some tmp file in between.
- Print rotated picture
lp -o media=a4 -o orientation-requested=4 -o fitplot figure.ps
- Print in fixed width format with awk
echo $a $b $c | awk '{for (i=1; i<=NF; i++) printf("%-20s ",$i);printf ("\n")}' > outfile.dat
where strings a,b,c may be entire lines.