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@harte-lyne.cawrote:
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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