execline is a (non-interactive) scripting language, like sh; but its
syntax is quite different from a traditional shell syntax. The execlineb
program is meant to be used as an interpreter for a text file; the other
commands are essentially useful inside an execlineb script.

execline is as powerful as a shell: it features conditional loops,
getopt-style option handling, filename globbing, and more. Meanwhile,
its syntax is far more logical and predictable than the shell's syntax,
and has no security issues.
