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document somewhat surprising behaviour

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12:58⎜<gps23:#ksh> someone please tell me why:   code=1; if [ "code" -eq 1 ] returns true
13:10⎜<mira|AO:#ksh> hm but I see the problem
13:10⎜<mira|AO:#ksh> code=1; x=code; [ "$x" -eq 1 ]
13:10⎜<mira|AO:#ksh> this is indeed unexpected
13:10⎜«pgas:#ksh» gps23: code=1+1;[ "code" -eq 2 ] && echo true #also works
as of now, we consider
13:13⎜«pgas:#ksh» gps23: when you use -eq there is something like an implicit $(( )) around the
     ⎜    arguments
13:14⎜«pgas:#ksh» [ code -eq 1 ] is the same as [ $((code)) -eq 1 ]
to be documented.
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tg 2009-03-23 12:15:33 +00:00
parent a8e3154b7a
commit c37c7aea61
1 changed files with 5 additions and 2 deletions
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mksh.1
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@ -1,4 +1,4 @@
.\" $MirOS: src/bin/mksh/mksh.1,v 1.151 2009/03/22 18:09:17 tg Exp $
.\" $MirOS: src/bin/mksh/mksh.1,v 1.152 2009/03/23 12:15:33 tg Exp $
.\" $OpenBSD: ksh.1,v 1.128 2009/03/06 12:28:36 jmc Exp $
.\"-
.\" Try to make GNU groff and AT&T nroff more compatible
@ -30,7 +30,7 @@
.el .xD \\$1 \\$2 \\$3 \\$4 \\$5 \\$6 \\$7 \\$8
..
.\"-
.Dd $Mdocdate: March 22 2009 $
.Dd $Mdocdate: March 23 2009 $
.Dt MKSH 1
.Os MirBSD
.Sh NAME
@ -3859,6 +3859,9 @@ expr \-a expr Logical AND.
( expr ) Grouping.
.Ed
.Pp
Note that a number actually may be an arithmetic expression, such as
a mathematical term or the name of an integer variable.
.Pp
Note that some special rules are applied (courtesy of POSIX)
if the number of
arguments to