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Diffstat (limited to 'bin/sh/USD.doc/t4')
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1 files changed, 180 insertions, 0 deletions
diff --git a/bin/sh/USD.doc/t4 b/bin/sh/USD.doc/t4 new file mode 100644 index 0000000..7719d6c --- /dev/null +++ b/bin/sh/USD.doc/t4 @@ -0,0 +1,180 @@ +.\" $NetBSD: t4,v 1.3 2010/08/22 02:19:07 perry Exp $ +.\" +.\" Copyright (C) Caldera International Inc. 2001-2002. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions are +.\" met: +.\" +.\" Redistributions of source code and documentation must retain the above +.\" copyright notice, this list of conditions and the following +.\" disclaimer. +.\" +.\" Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" +.\" This product includes software developed or owned by Caldera +.\" International, Inc. Neither the name of Caldera International, Inc. +.\" nor the names of other contributors may be used to endorse or promote +.\" products derived from this software without specific prior written +.\" permission. +.\" +.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA +.\" INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +.\" DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE +.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR +.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR +.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, +.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE +.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN +.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" @(#)t4 8.1 (Berkeley) 8/14/93 +.\" +.bp +.SH +Appendix\ A\ -\ Grammar +.LP +Note: This grammar needs updating, it is obsolete. +.LP +.LD +\fIitem: word + input-output + name = value +.sp 0.7 +simple-command: item + simple-command item +.sp 0.7 +command: simple-command + \fB( \fIcommand-list \fB) + \fB{ \fIcommand-list \fB} + \fBfor \fIname \fBdo \fIcommand-list \fBdone + \fBfor \fIname \fBin \fIword \*(ZZ \fBdo \fIcommand-list \fBdone + \fBwhile \fIcommand-list \fBdo \fIcommand-list \fBdone + \fBuntil \fIcommand-list \fBdo \fIcommand-list \fBdone + \fBcase \fIword \fBin \fIcase-part \*(ZZ \fBesac + \fBif \fIcommand-list \fBthen \fIcommand-list \fIelse-part \fBfi +.sp 0.7 +\fIpipeline: command + pipeline \fB\*(VT\fI command +.sp 0.7 +andor: pipeline + andor \fB&&\fI pipeline + andor \fB\*(VT\*(VT\fI pipeline +.sp 0.7 +command-list: andor + command-list \fB;\fI + command-list \fB&\fI + command-list \fB;\fI andor + command-list \fB&\fI andor +.sp 0.7 +input-output: \fB> \fIfile + \fB< \fIfile + \fB\*(AP \fIword + \fB\*(HE \fIword +.sp 0.7 +file: word + \fB&\fI digit + \fB&\fI \(mi +.sp 0.7 +case-part: pattern\fB ) \fIcommand-list\fB ;; +.sp 0.7 +\fIpattern: word + pattern \fB\*(VT\fI word +.sp 0.7 +\fIelse-part: \fBelif \fIcommand-list\fB then\fI command-list else-part\fP + \fBelse \fIcommand-list\fI + empty +.sp 0.7 +empty: +.sp 0.7 +word: \fRa sequence of non-blank characters\fI +.sp 0.7 +name: \fRa sequence of letters, digits or underscores starting with a letter\fI +.sp 0.7 +digit: \fB0 1 2 3 4 5 6 7 8 9\fP +.DE +.LP +.bp +.SH +Appendix\ B\ -\ Meta-characters\ and\ Reserved\ Words +.LP +a) syntactic +.RS +.IP \fB\*(VT\fR 6 +pipe symbol +.IP \fB&&\fR 6 +`andf' symbol +.IP \fB\*(VT\*(VT\fR 6 +`orf' symbol +.IP \fB;\fP 8 +command separator +.IP \fB;;\fP 8 +case delimiter +.IP \fB&\fP 8 +background commands +.IP \fB(\ )\fP 8 +command grouping +.IP \fB<\fP 8 +input redirection +.IP \fB\*(HE\fP 8 +input from a here document +.IP \fB>\fP 8 +output creation +.IP \fB\*(AP\fP 8 +output append +.sp 2 +.RE +.LP +b) patterns +.RS +.IP \fB\*(ST\fP 8 +match any character(s) including none +.IP \fB?\fP 8 +match any single character +.IP \fB[...]\fP 8 +match any of the enclosed characters +.sp 2 +.RE +.LP +c) substitution +.RS +.IP \fB${...}\fP 8 +substitute shell variable +.IP \fB$(...)\fP 8 +substitute command output +.IP \fB\`...\`\fP 8 +substitute command output +.IP \fB$((...))\fP 8 +substitute arithmetic expression +.sp 2 +.RE +.LP +d) quoting +.RS +.IP \fB\e\fP 8 +quote the next character +.IP \fB\'...\'\fP 8 +quote the enclosed characters except for \' +.IP \fB"\&..."\fP 8 +quote the enclosed characters except +for \fB$ \` \e "\fP +.sp 2 +.RE +.LP +e) reserved words +.DS +.ft B +if then else elif fi +case in esac +for while until do done +! { } +.ft +.DE |