Re: grep question
On Mon, Apr 08, 2002 at 04:41:08PM +0200, Johann Spies wrote:
> In the grep's info page I find the following which works as said. But
> I want to know why. What does the [c] do in this case?
It tells grep to find four character words that start with the letter
'c' and end with the three letters 'ron'.
The argument to grep is a *six* character word that starts with '[' so
it doesn't match.
> ------------------------
> 7. Why do people use strange regular expressions on `ps' output?
>
> ps -ef | grep '[c]ron'
>
> If the pattern had been written without the square brackets, it
> would have matched not only the `ps' output line for `cron', but
> also the `ps' output line for `grep'.
>
> -------------------------------
--
"Once the principle of government -- judicial monopoly and the power
to tax -- is incorrectly accepted as just, any notion of restraining
government power and safeguarding individual liberty and property is
illusory." -- Hans-Herman Hoppe
Rick Pasotto rickp@telocity.com http://www.niof.net
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