rc

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Rc" – news · newspapers · books · scholar · JSTOR (March 2014) (Learn how and when to remove this template message)

rc (for "

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

if [ "$1" = "hello" ]; then
    echo hello, world
else
    case "$2" in
    1) echo $# 'hey' "jude's"$3;;
    2) echo `date` :$*: :"$@":;;
    *) echo why not 1>&2
    esac
    for i in a b c; do
        echo $i
    done
fi

if(~ $1 hello)
    echo hello, world
if not {
    switch($2) {
    case 1
        echo $#* 'hey' 'jude''s'^$3
    case 2
        echo `{date} :$"*: :$*:
    case *
        echo why not >[1=2]
    }
    for(i in a b c)
        echo $i
}

a |[2] b    # pipe only 
standard error of a to b — equivalent to '3>&2 2>&1 >&3 | b' in Bourne shell[1]
: Advanced I/O Redirection 
a <>b # opens file b as a's 
standard output
a <{b} <{c} # becomes a {standard output of b} {standard output of c},
# better known as "process substitution"[1]: Pipeline Branching 

References