Plan 9 from Bell Labs’s /usr/web/sources/contrib/pac/rc/bin/chsgn
#!/bin/rc # Changes '+' to '-', and vice versa (using '!' as a swap char) # Thu Mar 29 09:02:59 MET 2007 Peter A. Cejchan <cej@gli.cas.cz | tyapca7@gmail.com> tr \x02b \! |tr \- \+ |tr \x021 \- #