Shell

sys_shell¶

Print the name of the currently running shell. Tries /proc/$$cmdline, then various 'ps' invocations, then procstat (FreeBSD), then falls back to inspecting version variables. $SHELL is intentionally not used as it reflects the login shell, not the running shell. Does not work for fish shell, which requires non-Bourne-compatible introspection.

Exit codes¶

• 0: Success
• 1: Unable to determine the running shell

Output on stdout¶

• Shell name, e.g. "bash", "ksh", "zsh"