Reboot when the reboot command dosent work!


To reboot a linux box when the server is not responding to the normal restart commands try the below commands.

reboot -f
echo b > /proc/sysrq-trigger
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Kill all java threads


Quick way to kill all java threads quickly if you cant get them to stop using conventional means.

sudo kill -9 `ps -ef|grep java|grep -v grep|awk {'print $2'}`

bash and or


Some good syntax examples for using and or within bash.

AND

use -a on the statement

if [ -f "$LOCK_FILE" -a $(echo  "$get") -eq $fail ]

OR

use -o on the statement

if [ -f "$LOCK_FILE" -o $(echo  "$get") -eq $fail ]