OpenGrok

$NetBSD: t4,v 1.3 2010/08/22 02:19:07 perry Exp $

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@(#)t4 8.1 (Berkeley) 8/14/93

.bp Appendix A - Grammar

Note: This grammar needs updating, it is obsolete.

item: word input-output name = value simple-command: item simple-command item command: simple-command ( command-list ) { command-list } for name do command-list done for name in word \*(ZZ do command-list done while command-list do command-list done until command-list do command-list done case word in case-part \*(ZZ esac if command-list then command-list else-part fi pipeline: command pipeline \*(VT command andor: pipeline andor && pipeline andor \*(VT\*(VT pipeline command-list: andor command-list ; command-list & command-list ; andor command-list & andor input-output: > file < file \*(AP word \*(HE word file: word & digit & - case-part: pattern ) command-list ;; pattern: word pattern \*(VT word else-part: elif command-list then command-list else-part else command-list empty empty: word: a sequence of non-blank characters name: a sequence of letters, digits or underscores starting with a letter digit: 0 1 2 3 4 5 6 7 8 9

.bp

Appendix B - Meta-characters and Reserved Words

a) syntactic

pipe symbol `andf' symbol `orf' symbol command separator case delimiter background commands command grouping input redirection input from a here document output creation output append

b) patterns

match any character(s) including none match any single character match any of the enclosed characters

c) substitution

substitute shell variable substitute command output substitute command output substitute arithmetic expression

d) quoting

quote the next character quote the enclosed characters except for \' quote the enclosed characters except for $ \` \e "

e) reserved words if then else elif fi case in esac for while until do done ! { }

Indexes created Wed Sep 24 02:09:48 GMT 2025