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document the [[ $foo = "$bar" ]] thing expressly

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tg 2010-08-14 20:13:10 +00:00
parent 14dc6071e7
commit b5bdc6d10f
1 changed files with 23 additions and 10 deletions
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mksh.1
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@ -1,4 +1,4 @@
.\" $MirOS: src/bin/mksh/mksh.1,v 1.233 2010/08/14 19:55:37 tg Exp $ .\" $MirOS: src/bin/mksh/mksh.1,v 1.234 2010/08/14 20:13:10 tg Exp $
.\" $OpenBSD: ksh.1,v 1.136 2010/07/15 20:04:35 schwarze Exp $ .\" $OpenBSD: ksh.1,v 1.136 2010/07/15 20:04:35 schwarze Exp $
.\"- .\"-
.\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 .\" Copyright © 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
@ -888,14 +888,6 @@ Operators (e.g.\&
.Sq \&! ) .Sq \&! )
must be unquoted. must be unquoted.
.It .It
The second operand of the
.Sq !=
and
.Sq =
expressions are patterns (e.g. the comparison
.Ic \&[[ foobar = f*r ]]
succeeds).
.It
Parameter, command, and arithmetic substitutions are performed as expressions Parameter, command, and arithmetic substitutions are performed as expressions
are evaluated and lazy expression evaluation is used for the are evaluated and lazy expression evaluation is used for the
.Ql && .Ql &&
@ -910,6 +902,23 @@ exists and is readable:
.Bd -literal -offset indent .Bd -literal -offset indent
$ [[ \-r foo && $(\*(Ltfoo) = b*r ]] $ [[ \-r foo && $(\*(Ltfoo) = b*r ]]
.Ed .Ed
.It
The second operand of the
.Sq !=
and
.Sq =
expressions are patterns (e.g. the comparison
.Ic \&[[ foobar = f*r ]]
succeeds).
This even works indirectly:
.Bd -literal -offset indent
$ bar=foobar; baz=\*(aqf*r\*(aq
$ [[ $bar = $baz ]]; echo $?
$ [[ $bar = "$baz" ]]; echo $?
.Ed
.Pp
Perhaps surprisingly, the first comparision succeeds,
whereas the second doesn't.
.El .El
.El .El
.Ss Quoting .Ss Quoting
@ -4213,8 +4222,12 @@ or
.Sq Fl n . .Sq Fl n .
Use tests like Use tests like
.Dq if \&[ x\&"$foo\&" = x"bar" \&] .Dq if \&[ x\&"$foo\&" = x"bar" \&]
instead, or the double-bracket operator: instead, or the double-bracket operator
.Dq if \&[[ $foo = bar \&]] .Dq if \&[[ $foo = bar \&]]
or, to avoid pattern matching (see
.Ic \&[[
above):
.Dq if \&[[ $foo = "$bar" \&]]
.Pp .Pp
.It Xo .It Xo
.Ic time .Ic time