List of commands and arguments:

- cd: change directory
  * cd [with no arguments] ---> change to user home directory
  * cd / ---> root directory
 
- ls: list directory contents
  * -a : all
  * --color
  * -h : print file sizes in human-readable format (using K,M,G,etc for KB,MB,GB,etc)
  * -l : long listing format
  * -n : numeric uid/gid (this way, students can find others' STUDENT IDs)
  * --sort
  
- cp: copy, mv: move (can be used to rename files, too)
  * -r : recursive
  * -f : force
  * -v : verbose  
  
- rm: remove
  * -d : directory
  * -f : force
  * -r : recursive
  
- mkdir: make directory

- pwd: print working directory

- ln: make links between files
  * -s : make symbolic links instead of hard links
  
- touch: update file timestamp
  * touch can create new files
  * -t : change a file to any desired time
  
- tail: output the last part of files
  * -f : follow the last changes to a file
  
- cat: concatenate and write files

- vim
  * Different modes of operation (Command Mode, Insert Mode)
  * How to create a file
  * How to save a file (using :w)
  * How to exit (using :q)
  * How to save a file and exit (using :wq)
  * How to exit without saving (using :q!)
  * How to search for texts (using / operator)
  
- locate
  * -i : case-insensitive search
  
- find
  * Sample usages:
    # find . -name "*.txt"  ----> finds all files with txt extension in current (.) directory
    # find / ! -user dousti ----> finds all files in the root directory whose owner is not dousti
    # find . -size +10M     ----> find all files in the current directory whose size are beyond 1MB
    
- whereis: locate the paths for a command's executable, source files, and man pages
  * -b : locate binary files
  * -m : locate man pages
  * -s : locate source files
  
- which: find out which version of a command will run

- ps: report process status
  * Common usages:
    # ps aux  ------> view all currently running processes
    # ps auxf ------> view a process tree 

- df, du
  * -h : print file sizes in human-readable format (using K,M,G,etc for KB,MB,GB,etc)

- who: print who is currently logged in
  * -a : all (detailed)