Implementing the "lp" command.
This command is required to exist in terms of compatibility with the Posix 1003.2 specification. It actually invokes the lpr service with the proper options.
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10
usr.sbin/lpr/lp/Makefile
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usr.sbin/lpr/lp/Makefile
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# @(#)Makefile 5.6 (Berkeley) 6/23/90
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BINDIR = /usr/bin
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MAN1 = lp.1
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beforeinstall:
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install -c -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} \
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lp.sh ${DESTDIR}${BINDIR}/lp
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.include <bsd.prog.mk>
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usr.sbin/lpr/lp/lp.1
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usr.sbin/lpr/lp/lp.1
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.\"
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.\" Copyright (c) 1995 Joerg Wunsch
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Joerg Wunsch
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.\" 4. The name of the developer may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id: lp.1,v 1.1 1995/01/22 17:47:24 j Exp $
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.\"
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.Dd January 22, 1995
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.Dt LP 1
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.Os
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.Sh NAME
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.Nm lp
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.Nd front-end to the print spooler
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.Sh SYNOPSIS
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.Nm lp
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.Op Fl c
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.Op Fl d printer
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.Op Fl n Ar num
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.Op Ar name ...
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.Sh DESCRIPTION
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.Nm Lp
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is a front-end to the print spooler as required by the
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.St -p1003.2
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specification. It effectively invokes
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.Xr lpr 1
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with the proper set of arguments.
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It generally prints the named files on the destination printer.
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.Pp
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Option
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.Fl c
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makes the
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.Nm
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command exit only after further access to any of the input files is no
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longer required. The application can then safely delete or modify the
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files without affecting the output operation.
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To specify a particular printer, option
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.Fl d Ar dest
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can be used. If no
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.Fl d
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is provided on the command line, the contents of the environmental
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variables
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.Ev LPDEST
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or
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.Ev PRINTER
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.Pq with this precedence
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are taken as the destination printer.
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Option
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.Fl n Ar num
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can be used to specify that
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.Ar num
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copies of each of the named files shall be printed.
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.Sh ENVIRONMENT
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As described above, the variables
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.Ev LPDEST
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and
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.Ev PRINTER
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are examined to select the destination printer.
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.Sh SEE ALSO
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.Xr lpr 1
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.Sh STANDARDS
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The
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.Nm lp
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command is expected to comply with the
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.St -p1003.2
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specification.
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.Sh AUTHOR
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This implementation of the
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.Nm
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command has been written by
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.if t J\(:org Wunsch.
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.if n Joerg Wunsch.
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.Sh BUGS
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The
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.Nm
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command inherits several bugs from the utilities invoked, namely it
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requires any option separated from its argument by a whitespace
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since the getopts implementation of
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.Xr sh 1
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is broken, and it does not honour dashes as input file names
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.Pq meant to use standard input
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since
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.Xr lpr 1
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ignores them.
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The
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.St -p1003.2
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specification does not provide any means to print non-text files. It
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rather requires the files to be printed to be text files limited to
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reasonable line lengths and printable characters.
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83
usr.sbin/lpr/lp/lp.sh
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usr.sbin/lpr/lp/lp.sh
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#!/bin/sh
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#
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#
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# Copyright (c) 1995 Joerg Wunsch
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#
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# All rights reserved.
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#
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# This program is free software.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by Joerg Wunsch
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# 4. The name of the developer may not be used to endorse or promote
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# products derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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# Posix 1003.2 compliant print spooler interface.
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#
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# $Id: lp.sh,v 1.1 1995/01/22 17:47:33 j Exp $
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#
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#
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# XXX Bugs:
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# . Our lpr command is not smart enough about dashes as input file names,
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# they should indicate the use of standard input.
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# . Our /bin/sh is not Posix-1003.2 compliant in its getopts command;
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# if the user specifies an option argument immediately after the
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# option, the variable OPTIND will be set wrong. (This way of
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# specifying option arguments is deprecated by Posix, but explicitly
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# allowed.)
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# . Our lpr command should allow the Posix-compliant way of specifying
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# options that take an argument; it currently requires the argument
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# to follow the option immediately.
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ncopies=""
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symlink="-s"
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# Posix says LPDEST gets precedence over PRINTER
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dest=${LPDEST:-${PRINTER:-lp}}
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#
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# XXX We include the -o flag as a dummy. Posix 1003.2 does not require
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# it, but the rationale mentions it as a possible future extension.
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#
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while getopts "cd:n:o:" option
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do
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case $option in
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c) # copy files before printing
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symlink="";;
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d) # destination
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dest="${OPTARG}";;
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n) # number of copies
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ncopies="-#${OPTARG}";;
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o) # (printer option)
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: ;;
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*) # (error msg printed by getopts)
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exit 2;;
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esac
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done
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shift $(($OPTIND - 1))
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exec /usr/bin/lpr "-P${dest}" ${symlink} ${ncopies} "$@"
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