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Worth noting that the Unix shell itself is not a "built-in". The kernel is agnostic about the user interface, which is left entirely to userspace programs to i
by retrac 3y ago
Worth noting that the Unix shell itself is not a "built-in". The kernel is agnostic about the user interface, which is left entirely to userspace programs to implement. (That was one of Unix's major innovations.)
- whimsicalism 3y agobuilt in to the shell, not the kernel lol
- pkulak 3y ago/bin/sh is a POSIX requirement though.
- rascul 3y agosh is, but not the location. > Applications should note that the standard PATH to the shell cannot be assumed to be either /bin/sh or /usr/bin/sh, and should be determined by interrogation of the PATH returned by getconf PATH, ensuring that the returned pathname is an absolute pathname and not a shell built-in. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sh.html#tag_20_117_16 https://pubs.opengroup.org/onlinepubs/9699919799/utilities/s... However, in my experience, I don't recall seeing any POSIX or POSIX like system that didn't have /bin/sh.
- pkulak 3y agoOh interesting. I assumed that since even Nix has a hard-coded /bin/sh, it must be required. Probably _essentially_ required.