I much agree with the sister comment and I write my shells for /bin/sh also. There is this wonderful tool called ShellCheck ( https://www.shellcheck.net/ https:

I much agree with the sister comment and I write my shells for /bin/sh also. There is this wonderful tool called ShellCheck ( https://www.shellcheck.net/ https://www.shellcheck.net/ ) that checks that your script is actually POSIX-compliant if it starts with #!/bin/sh