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UNOS
- UNOS is the first UNIX clone (initiated by a group of former AT&T employees in 1980) and UNOS introduced a generalized option parser (the first in the UNIX world) in April 1982. This option parser supported -long options with a single dash.
unix.stackexchange.com/questions/257672/the-discrimination-between-short-and-long-option-is-only
UNOS massively used single dash long options and UNOS was written by former AT&T employees. In 1988, GNU came out with double dash long options even though UNOS verified that single dash long options work great.
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using single dash with long name [closed] I know that a...
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Jan 26, 2016 · Multics uses -long options with a single dash and the Multics project was initiated the 1960s. UNOS is the first UNIX clone (initiated by a group of former AT&T employees in 1980) and UNOS introduced a generalized option parser (the first in the UNIX world) in April 1982.
single dash is implemented by the getopt and is posix standard function, double dash in getopt_long and is a gnu standard. Traditionally, a single dash supplies a single character option like this: -A or -V etc but need not be limited to that.
Oct 16, 2014 · Single-letter options preceded by single dash, groupable when there is no argument, argument can be attached to option letter or in next argument (many, many Unix commands; most POSIX commands). Single-letter options preceded by single dash, grouping not allowed, arguments must be attached (RCS).
Jul 7, 2014 · This version of ps accepts several kinds of options: 1 UNIX options, which may be grouped and must be preceded by a dash. 2 BSD options, which may be grouped and must not be used with a dash. 3 GNU long options, which are preceded by two dashes. GNU tar also supports multiple option styles.
Dec 13, 2023 · short options with single dash vs long options with double dash. short options can be combined into a single argument; for example: ls -lrt #instead of ls -l -r -t If we allow long options with single dash, it causes ambiguity. To resolve this we use double dash for long options.
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Aug 24, 2016 · From getopt 's manpage: -a, --alternative. Allow long options to start with a single '-'. Or, if we're talking about the getopt* C functions: getopt_long_only() is like getopt_long(), but '-' as well as "--" can indicate a long option. Share.
