Testing e-mail with nc

shc creates static binaries from shell scripts.

There is rarely performance gain from this, is most often used as another layer of abstraction for security through obscurity.

Example:

shc -e '12/31/2020' -m 'Contact Your Administrator' -rTv -f ./potd-ifadmin.sh
This will create:
./potd-ifadmin.sh.x
./potd-ifadmin.sh.x.c
      
For most cases, the ".sh.x" file is what you want to distribute.