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 logic and predictable than the shell's syntax, and has no security issues.
All these commands exit 111 if they encounter a temporary error, and 100 if they encounter a permanent error - such as a misuse.
(Script parser / launcher)
(Process state control)
(Basic block management)
(Positional parameters and options management)