dirname

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

-z, --zero

end each output line with NUL, not newline

--help

display this help and exit

--version

output version information and exit

dirname /usr/bin/

-> "/usr"

dirname dir1/str dir2/str

-> "dir1" followed by "dir2"

dirname stdio.h

-> "."

Written by David MacKenzie and Jim Meyering.

GNU coreutils online help: https://www.gnu.org/software/coreutils/
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