minix/bin/sh/USD.doc/t4
Lionel Sambuc d90bee9749 Importing bin/sh
/etc/profile enables by default tabcompletion, as well as emacs mode,
in order to keep the old MINIX ash behavior.

Note: The shell now refuses to source a script without a relative or
      absolute path.
      This means:
        - '. myscript.sh' fails, while
        - '. ./myscript.sh' succeeds

Change-Id: I0be89b0747bd005e4c05cadb937af86883627dc6
2014-08-29 12:56:04 -04:00

180 lines
4.5 KiB
Text

.\" $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
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.\" 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Note: This grammar needs updating, it is obsolete.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