set status [lindex $details 2]
    } else {
        # Some other error; regenerate it to let caller handle
        return -options $options -level 0 $results
    }
}
.CE
.VS 8.6
.PP
This is more easily written using the \fBtry\fR command, as that makes
it simpler to trap specific types of errors. This is
done using code like this:
.PP
.CS
try {
    set results [\fBexec\fR grep foo bar.txt]
    set status 0
} trap CHILDSTATUS {results options} {
    set status [lindex [dict get $options -errorcode] 2]
}
.CE
.VE 8.6
.SS "WORKING WITH QUOTED ARGUMENTS"
.PP
When translating a command from a Unix shell invocation, care should
be taken over the fact that single quote characters have no special
significance to Tcl.  Thus:
.PP
.CS