>>175
どこにってのは、どの項目かよく見ろと暗に示してるのかな？
sh
https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/sh.html
EXIT STATUS
The following exit values shall be returned:
0
The script to be executed consisted solely of zero or more blank lines or comments, or both.
1-125
A non-interactive shell detected an error other than command_file not found or executable, including but not limited to syntax, redirection, or variable assignment errors.
126
A specified command_file could not be executed due to an [ENOEXEC] error (see Command Search and Execution, item 2).
127
A specified command_file could not be found by a non-interactive shell.

test
https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/test.html
EXIT STATUS
The following exit values shall be returned:
0
expression evaluated to true.
1
expression evaluated to false or expression was missing.
>1
An error occurred.

>>177
理解しました。