Linux Tools

This list will continue to grow as I come across useful tools in Linux. I have also listed the command-line that I most frequently use:

ps - get the process information

• ps -flycae # will give information on scheduling class and kernel function name where process is sleeping

mcelog - Machine check log

• Determine system errors, decode, and log in syslog like /var/log/messages
  mcelog --dmi --syslog
  PS: The decoded hardware module is sometimes not helpful in determining the module at fault

OProfile - Profiling Linux system

• Covered under separate post here. 

mdadm - Manage Software  RAID

• Use mdadm for software mirroring devices:
  mdadm -C --level=raid1 --raid-devices=2 /dev/md0 /dev/sdb1 /dev/sdc1
  mdadm --manage /dev/md0 --fail /dev/sdc1
  mdadm --manage /dev/md0 --remove /dev/sdc1
  mdadm --manage --stop /dev/md0
  For striping, better to use LVM

LVM - Logical Volume Manager

• pvcreate <list of devices>
• vgcreate <vg-name> <list of pv devices>
• lvcreate -i<#of vg devices to stripe across> -I<stripe-size-default64k> -L<size-in-MB> -n<volume-name> <vg-name>

MUTT - The Mutt Mail User Agent

• echo "<message-body>" | mutt -a <attachment-file> -s "<subject>" <To email> [-b <BCC email>] [-c <CC email>]