dirname - strip last component from file name
dirname [OPTION] NAME...
Output each NAME with its last non-slash component and trailing slashes removed; if NAME contains no /'s, output '.' (meaning the current directory).
end each output line with NUL, not newline
display this help and exit
output version information and exit
-> "/usr"
-> "dir1" followed by "dir2"
-> "."
Written by David MacKenzie and Jim Meyering.
GNU coreutils online help: https://www.gnu.org/software/coreutils/
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Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later https://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
Full documentation https://www.gnu.org/software/coreutils/dirname
or available locally via: info '(coreutils) dirname invocation'