When I run this one line script, on a sarge system, debsums -ca --generate=all --deb-path=/mnt/$1/install/deblinks here is how ps aux -H displays the resulting process: /usr/bin/perl -w /usr/bin/debsums -ca --generate=all --deb-path=/[...]I always thought the shell defaulted to bash or ksh, which is why I never put the #!/bin/sh at the top of the file, and this and all my dozens of other bash scripts seem to work as expected. Why and how is perl being invoked here?