Test operators

-e file exists

-f file exists and is not a directory

-s file is not empty

-d directory exists

-x file is executable (for the user running the test)

-r file is readable (for the user running the test)

-w file has write permission (for user running the test)

-h / -L file is a symbolic link

! "not"

Compound Comparison

-a logical 'and' similar to &&

-o logical 'or' similar to ||

Integer Comparison

-eq is equal to

-ne is not equal to

-gt or > is greater t...