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