Simple Way of Ordering Error Messages over Multiple Syslog Files

 for file in `ls -lt messages*| awk '{print $9}'`; do echo $file; echo; grep ERROR $file; done  

Check syntax of puppet manifests

How to do this:-

 puppet parser validate manifestname.pp  

View what the spec file does on an RPM

This can be done using the following command:-

 rpm --scripts -qp rpmname.rpm  

Extend logical volume to occupy the rest of the free space

Check that nothing is locking the partition:-

 lsof /opt/  

Unmount the partition:-

 umount /opt  

Extend the partition:-

 lvextend -l +100%FREE /dev/mapper/vg_root-lv_opt  

Check the filesystem:-

 e2fsck -f /dev/mapper/vg_root-lv_opt  

Resize the filesystem:-

 resize2fs -p /dev/mapper/vg_root-lv_opt  

Check the filesystem:-

 e2fsck -f /dev/mapper/vg_root-lv_opt  

Remount the partition:-

 mount /opt/