Public bug reported:
Bash builtins like doesn't have -h (or --help) option.
$ alias -h
bash: alias: -h: invalid option
alias: usage: alias [-p] [name[=value] ... ]
$ builtin -h
bash: builtin: -h: invalid option
builtin: usage: builtin [shell-builtin [arg ...]]
$ apt-cache policy bash
bash:
This feature is desirable for all other builtins. It looks like builtins
only use the short versions of options and not the long versions.
Reference: https://sources.debian.net/src/bash/4.3-12/builtins/jobs.def/#L242
while ((opt = internal_getopt (list, ahr)) != -1)
{
switch (opt)
On executing the following command
$ grep SIGRTMIN /usr/include/ -r
/usr/include/asm-generic/signal.h:#define SIGRTMIN 32
/usr/include/x86_64-linux-gnu/asm/signal.h:#define SIGRTMIN 32
/usr/include/x86_64-linux-gnu/bits/signum.h:#define SIGRTMIN
(__libc_current_sigrtmin ())
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