Linux notes

• KDE & Gnome hotkeys: www.clug.ca/node/225
• System info: linuxaria.com/…nfo-cheat-sheet
• How to Recover from a Linux Hang (raising elephants en.wikipedia.org/…ic_SysRq_key
• Find version: rpm -q centos-release

• Network down/up/new ip:

ifdown eth0 , ifup eth0
ifconfig eth1 down or up
sudo dhclient -r eth0 #release
sudo dhclient -v eth0 #renew (verobose)

• To keep ssh open, edit /etc/ssh/ssh_config and add: ServerAliveInterval 180
• Truncate a log file: cat /dev/null > some_log_file.log
• vim cheatsheet: www.terminally-incoherent.com/…
• hard drive “smart” monitoring: www.cyberciti.biz/…ailing.html
• More on smart: it.toolbox.com/…ng-to-do-31523
• check hard drive reliability with badblocks: calomel.org/…dblocks_wipe.html
  • on CentOS you can install with yum install e2fsprogs
• Article on “Managing your log files” www.tuxradar.com/…ur-log-files
• Good reference on fstab: www.tuxfiles.org/…p/fstab.html
• copy MBR records: www.shell-fu.org/lister.php?i…
• Compiling from source: how-to.linuxcareer.com/…ystems
• To clone a drive with an enhanced version of DD, use ddrescue:
  http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html
• grep for particular type of file: grep -R --include="*.txt" "$add"
• To check integrity of ext4 filesystem
  • www.commandlinefu.com/…ss-info – Great example
  • fsck.ext4 -cDfty -C 0 /dev/sdxx
  • manpages.ubuntu.com/…t2.8.html – options
• to prevent lines that begin with spaces being saved in bash history, append the following to /etc/profile
  export HISTCONTROL=ignoreboth