Linux Field Manual
is a must have for any IT admin or professional.
A comprehensive pocket guide to Linux, includes descriptions and command references for:
POST, MBR and Bootloaders
Kernel and Modules
Daemons and Processes
Common Admin Commands
Scripting (BASH, Python, Perl)
Filesystem Architechture
Remote Access (SSH, Samba, FTP)
Common Web Servers
Common Databases (MySQL, MS SQL, PostgreSQL)