This scum uses sh in shebang.
What's wrong with #!/bin/sh?
Tell him that it's just a symlink.
It depends on your operating system.
In FreeBSD, /bin/sh is not a symlink.
In Debian and Ubuntu, /bin/sh is a symlink to dash.
#!/bin/sh is only problematic when run in problematic operating systems that incorrectly symlink /bin/sh to a non POSIX compliant shell.