printf() isn't builtin by POSIX sh(1p)

[sighook]

printf (as function, not a binary) is not builtin by POSIX sh(1p) but we're using it.

We have the following printf() references:

$ grep -n printf rc*
rc.multi:16:    printf "starting services:"
rc.multi:18:            printf " %s" $SYSLOG
rc.multi:20:                    printf "%s" "[ERROR]"
rc.multi:23:            printf " %s" "$service"
rc.multi:25:                    printf "%s" "[ERROR]"

An alternative like echo -n is not POSIX too. 😄
If we're trying to refer to the printf as binary (/usr/bin/printf) we're breaking separate /usr boot, since the network setup is one of the service. 😄

By the time, dash(1) that we are using as sh(1) have printf builtin and seems like in the present situation, it is the least of the evils.

Figure out what can be done.