Mag. Leonhard Landrock wrote:
> Hi!
>
> I've got some questions to the use of conditional expressions. I took a look
> at the bash manual page, but nevertheless would like some more explanation.
>
> First, there is the "/etc/profile.d/readline.sh" file:
>
> When is the following expression true?
>
> if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ] ; then
> INPUTRC=/etc/inputrc
> fi
>
I think you are getting confused by the -a here. It *is* a bit
ambiguous. The [ expr ] construct is a synonym for 'test'. Look at the
'test' builtin in the bash man page (quite a way down):
expr1 -a expr2
True if both expr1 and expr2 are true.
The -a here is an expression operator between two operands, not a
literal conditional expression like -z or ! -f in this example.
Note: We could have made it really confusing by the valid statement:
if [ -z "$INPUTRC" -a ! -a "$HOME/.inputrc" ] ; then
...
:)
-- Bruce
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