there are numbers at the start of the line?
e.g. your regex is actually something more like "^[0-9]+ su"
and depending on your unix variant (e.g. not a linux, possibly)
you really mean egrep and not grep (although to a centos list, yes they're
likely actually the same, but it still might be worth noting)
On Mon, Sep 16, 2013 at 12:27 PM, James B. Byrne <byrnejb@xxxxxxxxxxxxx>wrote:
> I am obviously missing something basic here but can someone explain to me
> what
> is wrong with the first statement, which returns nothing?
>
> $ history | grep ^su
> $ history | grep su
> 2997 su -l
> 3024 su -l
> 3050 su -l
> 3054 su -l
>
> Thanks,
>
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