Usefull linux commands (ongoing)
These are just commnads i had to hunt for in linux and want to remember for possible later use.
this will show the last 10 lines of a file (messages in this example) and monitor the file for changes, press ctrl-c to exit
tail -f /var/log/messages
create a loop file (replace 1024 with the size in MB)
dd if=/dev/zero of=loop_filename bs=1M count=1024
mkfs.ext3 -F loop_filename
Check fragmentation of XFS filesystem (50% is not bad really, change sda6 to your xfs partition)
xfs_db -c frag -r /dev/sda6
Kill a stubborn process, #### is the process id (PID)
kill -9 ####