That is not entirely true. There is sysexits.h, which tried to standardize some exit codes (originally meant for mail filters). It is used by, for instance, ar

That is not entirely true. There is sysexits.h, which tried to standardize some exit codes (originally meant for mail filters). It is used by, for instance, argp_parse(). https://sourceware.org/git/?p=glibc.git;a=blob;f=misc/sysexits.h https://sourceware.org/git/?p=glibc.git;a=blob;f=misc/sysexi...