Linux Nuggetz

Example: range of date to be extracted in the /var/log/message. Oct 26-27 our x will be Oct 26, y will be Oct 27 1. Get the first line number which will be our x reference (x - Oct 26). $ grep -n 'Oct 26' /var/log/messages | head The initial reference of x = 29933 Sample Output: 29933:Oct 26 00:00:00 postfix nagios: LOG ROTATION: DAILY 29934:Oct 26 00:00:00 postfix nagios: LOG VERSION: 2.0 29935:Oct 26 00:00:00 postfix nagios: CURRENT HOST STATE: localhost;UP;HARD;1;PING OK - Packet loss = 0% 29936:Oct 26 00:00:00 postfix nagios: CURRENT SERVICE STATE: localhost;Current Load;OK;HARD;1;OK 29937:Oct 26 00:00:00 postfix nagios: CURRENT SERVICE STATE: localhost;Current Users;OK;HARD;1 29938:Oct 26 00:00:00 postfix nagios: CURRENT SERVICE STATE: localhost;HTTP;WARNING 29939:Oct 26 00:00:00 postfix nagios: CURRENT SERVICE STATE: localhost;PING;OK;HARD;1;PING OK - Packet loss = 0% 29940:Oct 26 00:00:00 postfix nagios: CURRENT SERVICE STATE: localhost;Root ...

At times we encounter java process that won't stop by issuing the usual command "./shutdown.sh", or in some cases a multiple instance was created when the program was not properly restarted. Below are the sample process status of the java in my linux box. [root@geone bin]# ps -eaf | grep java root 27272 1 0 Jul06 ? 00:00:22 /usr/java/j2sdk1.4.1_01/bin/java root 27684 27273 0 Jul06 ? 00:03:01 /usr/java/j2sdk1.4.1_01/bin/java root 27685 27273 0 Jul06 ? 00:04:23 /usr/java/j2sdk1.4.1_01/bin/java root 27686 27273 0 Jul06 ? 00:03:01 /usr/java/j2sdk1.4.1_01/bin/java root 27687 27273 0 Jul06 ? 00:03:01 /usr/java/j2sdk1.4.1_01/bin/java root 27688 27273 0 Jul06 ? 00:03:04 /usr/java/j2sdk1.4.1_01/bin/java root 27689 27273 0 Jul06 ? 00:03:04 /usr/java/j2sdk1.4.1_01/bin/java root 27690 27273 0 Jul06 ? 00:03:04 /usr/java/j2sdk1.4.1_01/bin/java root 27691 27273 0 Jul06 ? 00:03:01 /usr/java/j2sdk1.4.1_01/bin/java root 27692 27273 0 Jul06 ? 00:03:01 /usr/java/j2sdk1.4.1_01/bin/java root 2...