Reference

uu-dirname(1)

Strip last component from file name

NAME

dirname - Strip last component from file name

SYNOPSIS

dirname [OPTION] NAME...

DESCRIPTION

Strip last component from file name

OPTIONS

-z, --zero

separate output with NUL rather than newline

-h, --help

Print help

-V, --version

Print version

EXTRA

Output each NAME with its last non-slash component and trailing slashes removed; if NAME contains no /'s, output '.' (meaning the current directory).

VERSION

v(uutils coreutils) 0.12.0