Reference

Bash File Test Operators

October 5, 2022

Usage Example:

if [[ -e "$file" ]]; then
  echo "pass"
else
  echo "does not pass"
fi

Operator	Meaning
`-e`	File exists
`-s`	File exists and is not empty
`-d`	File exists and is a directory
`-f`	File exists and is a regular file
`-v`	Variable is set and been assigned a value
`-z`	String is zero
`-n`	String is non-zero