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SHELL SCRIPT (SPECIAL VARIABLES ($1 $2 (shift: $1 -> $2, $2 -> $3,…

- - - - $file1 -nt $file2
        
        $file1 -od $file2
        
        reverse
        
        check file 1 has a new modifier day newer than file2
      - [ -s $filename ]
        
        check filename is not empty
      - [ -e $filename ]
        
        check filename exists
      - [ -f $filename ]
        
        check filename is the regular files
    - - =, !=
      - -z, -n: argument is empty or not
    - - case $1 in
        a)
        do something
        ;;
        b)
        do something
        ;;
        *)
        do something
        esca
- - - - basename file1.html .html
    - - basename /home/ thien/file1
  - - - print fifth field of input
  - - - delete from line 3 to 6 of passwd