getopt: document special symbols that should not be used as option ch… #3697
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…aracters getopt(3) routines return `?` or `:` when an unknown option character is encountered or an option is missing its required argument, respectively. It also disallows `;` as an option character. Documenting this makes users aware that they may not use these reserved symbols as option characters, e.g. `-?` which is used in some older programs. Addresses: util-linux#2995 Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
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getopt(3) routines return
?or:when an unknown option character is encountered or an option is missing its required argument, respectively. It also disallows;as an option character. Documenting this makes users aware that they may not use these reserved symbols as option characters, e.g.-?which is used in some older programs.Addresses: #2995
Addresses: #2594