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test(1): Clarify grammar ambiguity and -a/-o vs shell &&/||.

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jilles 2010-09-10 14:00:27 +00:00
parent 3f97220f48
commit d26fd835e7
1 changed files with 12 additions and 5 deletions
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17
bin/test/test.1
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@ -32,7 +32,7 @@
.\" @(#)test.1 8.1 (Berkeley) 5/31/93
.\" $FreeBSD$
.\"
.Dd July 31, 2006
.Dd September 10, 2010
.Dt TEST 1
.Os
.Sh NAME
@ -310,6 +310,14 @@ are evaluated consistently according to the rules specified in the
standards document.
All other cases are subject to the ambiguity in the
command semantics.
.Pp
In particular, only expressions containing
.Fl a ,
.Fl o ,
.Cm \&(
or
.Cm \&)
can be ambiguous.
.Sh EXIT STATUS
The
.Nm
@ -338,12 +346,11 @@ specification.
Both sides are always evaluated in
.Fl a
and
.Fl o ,
unlike in the logical operators of
.Xr sh 1 .
.Fl o .
For instance, the writable status of
.Pa file
will be tested by the following command even though the former expression
indicated false, which results in a gratuitous access to the file system:
.Pp
.Dl "[ -z abc -a -w file ]"
To avoid this, write
.Dl "[ -z abc ] && [ -w file ]"