Can someone please verify what this means?
if [ "$1" = "offlinebackup" -o "$1" = "onlinebackup" ]; then
I am thinking it means that if the first argument passed is equal to
"offlinebackup" OR "onlinebackup" then do the following.
I can't seem to find any information about the "-o" anywhere.
A confirmation and reference would be very helpful. Thanks in advance.
hobbzilla wrote:
> Can someone please verify what this means?
>
> if [ "$1" = "offlinebackup" -o "$1" = "onlinebackup" ]; then
>
> I am thinking it means that if the first argument passed is equal to
> "offlinebackup" OR "onlinebackup" then do the following.
>
> I can't seem to find any information about the "-o" anywhere.
>
> A confirmation and reference would be very helpful. Thanks in advance.
>
Yes. See the manual page of test (man test)...
EXPRESSION1 -o EXPRESSION2
either EXPRESSION1 or EXPRESSION2 is true
Janis
On 10 Mar 2006 12:46:31 -0800, "hobbzilla"
>Can someone please verify what this means?
>
>if [ "$1" = "offlinebackup" -o "$1" = "onlinebackup" ]; then
>
>I am thinking it means that if the first argument passed is equal to
>"offlinebackup" OR "onlinebackup" then do the following.
>
>I can't seem to find any information about the "-o" anywhere.
Try;
[ "$1" = "offlinebackup" ] || [ "$1" = "onlinebackup" ]
I believe this is actually prefered form, according to POSIX.
There are problems with the complicated precedence rules of 'test'
(mixing up operators with operands) but it becomes a rats nest
after more than about 4 arguments. You never need to use -o or -a
with this form and it saves a lot of problems.
>
>A confirmation and reference would be very helpful. Thanks in advance.
>
Try POSIX IEEE Std 1003.1, shell & utilities - "test", I don't have a URL but a search
with find it. Also a very good one is the freebsd man pages at;
http://www.freebsd.org/cgi/man.cgi?query=test&apropos=0&sekt ion=0&manpath=SunOS+4.1.3&format=html
byefornow
laura
--
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