What is the conceptual difference between the lp and lpr commands on UNIX systems?

In: Linux

lpr is the off-line printer...
lp is just a frontend to the lpr. (that is in FreeBSD, maybe is the same in Sun Solaris), out put from man lp(1):


LP(1) FreeBSD General Commands Manual LP(1)

NAME
lp
-- front-end to the print spooler

SYNOPSIS
lp
[ -cs ] [ -o option ] [ -d printer ] [ -n num ] [ name ... ]

DESCRIPTION
The lp utility is a front-end to the print spooler as required by the
IEEE Std 1003.2 (``POSIX.2'') specification. It effectively invokes
lpr(1) with the proper set of arguments.

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