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Concept
Rc
Summary
rc (for "run commands") is the command line interpreter for Version 10 Unix and Plan 9 from Bell Labs operating systems. It resembles the Bourne shell, but its syntax is somewhat simpler. It was created by Tom Duff, who is better known for an unusual C programming language construct ("Duff's device").
A port of the original rc to Unix is part of Plan 9 from User Space. A rewrite of rc for Unix-like operating systems by Byron Rakitzis is also available but includes some incompatible changes.
Rc uses C-like control structures instead of the original Bourne shell's ALGOL-like structures, except that it uses an if not construct instead of else, and has a Bourne-like for loop to iterate over lists. In rc, all variables are lists of strings, which eliminates the need for constructs like "1" = "hello" ]; then
echo hello, world
else
case "$2" in
- echo # 'hey' "jude's"3;;
- echo
date:@":;; ) echo why not 1>&2 esac for i in a b c; do echo 1 hello) echo hello, world if not { switch(2) { case 1 echo #* 'hey' 'jude''s'^"*: :*: case * echo why not >[1=2] } for(i in a b c) echo i } Rc also supports more dynamic piping: a |[2] b # pipe only standard error of a to b — equivalent to '3>&2 2>&1 >&3 | b' in Bourne shell a b # opens file b as a's standard input and standard output a
Official source
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