Bash Comparison Operators

Bash Comparison Operators.sh

# Bash Comparison Operators

### Integer Comparison
    Operator   Description                      Example
    -eq        Is Equal To                      [ 100 -eq 100 ]
    -ne        Is Not Equal To                  [ 100 -ne 200 ]
    -gt        Is Greater Than                  [ 200 -gt 100 ]
    -ge        Is Greater Than Or Equal To      [ 100 -ge 100 ]
    -lt        Is Less Than                     [ 100 -lt 200 ]
    -le        Is Less Than Or Equal To         [ 100 -le 100 ]
    ==         Is Equal To                      (( 100 == 100 ))
    !=         Is Not Equal To                  (( 100 != 200 ))
    <          Is Less Than                     (( 100 < 200 ))
    <=         Is Less Than Or Equal To         (( 100 <= 100 ))
    >          Is Greater Than                  (( 200 > 100 ))
    >=         Is Greater Than Or Equal To      (( 200 >= 100 ))

### String Comparison
    Operator   Description Example
    = or ==    Is Equal To                      [ abc == abc ]
    !=         Is Not Equal To                  [ abc != def ]
    >          Is Greater Than (ASCII)          [ def > abc ]
    >=         Is Greater Than Or Equal To      [ def >= def ]
    <          Is Less Than                     [ abc < def ]
    <=         Is Less Than Or Equal To         [ abc <= def ]
    -n         Is Not Null                      [ -n abc ]
    -z         Is Null (Zero Length String)     [ -z "" ]

### File Tests
    Operator   Description                      Example
    -d         Directory                        [ -d /tmp/abc ]
    -e         Exists (also -a)                 [ -e /tmp/abc ]
    -f         Regular file                     [ -f /tmp/abc ]
    -h         Symbolic link (also -L)          [ -h /tmp/abc ]
    -p         Named pipe                       [ -p /tmp/abc ]
    -r         Readable by you                  [ -r /tmp/abc ]
    -s         Not empty                        [ -s /tmp/abc ]
    -S         Socket                           [ -S /tmp/abc ]
    -w         Writable by you                  [ -w /tmp/abc ]
    -N         Modified since last read         [ -N /tmp/abc ]

### File Comparison
    Operator   Description                      Example
    -nt        Newer Than                       [ /tmp/a -nt /tmp/b ]
    -ot        Older Than                       [ /tmp/a -ot /tmp/b ]
    -ef        Hard Link To                     [ /tmp/a -ef /tmp/b ]

#### Sources
- [freeseotool.org](https://freeseotool.org/)
- [currencyaz.com](https://currencyaz.com/)