On 11/10/2011 10:41 AM, Anton Aylward wrote:
George OLson said the following on 11/09/2011 09:25 PM:
I am trying to set up ssh, and I find different command line examples on the internet to help in my research. As I am learning CLI and scripting, can someone explain the following to me please?
In a given directory, I typed in the following line.
if [ ! -f authorized_keys ]; then touch authorized_keys ; chmod 600 authorized_keys ; fi
It created the file authorized_keys and gave it the time stamp and changed the permission. I got that part.
The only thing I don't understand is the very first boolean clause after the "if".
What exactly does the exclamation mark signify?
MAN(1) Test says
! EXPRESSION EXPRESSION is false
Ah, ok, so the exclamation is just like saying "not" Found the other info I needed also. Thanks for the help. George
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