• Regular Files
• Directory Files
• Device Files

Basic Commands

• pwd, logname, who, finger
• Exit, date, cal

Creating Users & Groups

• groupadd, groupdel
• useradd, userdel

System startup & Shutdown

• Init, halt, shutdown
• Different Run levels
• Different date formats

Working with files

• cat, touch, rm
• cp, mv

• mkdir, cd, rmdir, rm –r

• Redirecting output
• Redirecting Input

• cmp, diff, comm

• find, locate, which

• gzip, gunzip

• ls, ls options

• pg, more, head, tail

• chmod, chown, chgrp, umask

Meta/Wild Card-characters

• Class, Anchors
• Repetition, Alteration
• Group, Dot

• What is pattern
• Usage of regular expression
• Different types of pattern
• Character pattern
• Word pattern
• Line pattern

• grep, grep with options

• cut, paste

 Tools for sorting

• Sort by lines, Sort by fields
• Sort with options, uniq

Changing information in files

• tr, sed

Piping

• usage of piping
• piping with filters
• tee command

Communication Tools

• write, wall
• mail, mail with options

Networking protocols

• telnet, ftp

• du,  df with options

• Foreground jobs, background jobs
• Killing jobs, nohup

• ps , ps with options

• 3 modes
• Command mode
• Insert mode
• Ex command mode