salias is a wrapper for programs that allows arguments to those programs to be aliased. For example, salias could expand "gpg -r friends --encrypt" to "gpg -r bob -r frank --encrypt". This is more useful than using simple environment variables, as other programs calling the wrapped-program don't have to worry about searching environment variables. Also, salias deals well with things needing repeating prefix options, such as with GnuPG's "-r" option (as shown in the example stated).
