-s FILE (conditional operator)

true if the file exists and is not empty, i.e. has a size greater than zero.

Links

• Bash manual
• POSIX specification of test

Examples

Different ways to test if a file is not empty:

1 2 3 4

test -s ~/file && echo "not empty" [ -s ~/file ] && echo "not empty" # Bash [[ -s ~/file ]] && echo "not empty"