No Michael, you don 'get it' yet.
And you won't for a while.
In the context of what you are talking, '^', '$' and '*' are components of a
'regular expression'
A 'regular expression' is a language that allows you to describe strings and
it can be *VERY* complex.
http://en.wikipedia.org/wiki/Regular_expression
ET
Michael Havens writes:
oh. so '*' searches the first string in the lines.... I understand that
now.
and $ matches the end string of lines. I get it now!
:-)~MIKE~(-:
On Sat, Mar 7, 2015 at 8:43 AM, sean <[email protected]> wrote:
$ matches the end of line. You don't get any output because that file
doesn't have any lines ending in 'bmike1'. That's why it was recommended
that you grep for a shell.
You are getting the same output with and without the ^ because it happens
to be that bmike1 always appears at the beginning of the line in that file.
Create a new file with these two lines:
My name is bmike1
bmike1 is my name
Then do grep ^bmike1, grep bmike1 and just grep bmike1 (no -E necessary).
On Mar 7, 2015 8:34 AM, "Michael Havens" <[email protected]> wrote:
Okay, I tried to grep my passwd file with and without the '^' and it
seems both are the same. What's the difference between the commands and why
should I bother to type the '^'? As to the '$' if all it does is produces a
blank linr what is it's use?
bmike1@c521 ~ $ grep -E '^bmike1:' /etc/passwd
bmike1:x:1000:1000:Michael Havens,,,:/home/bmike1:/bin/bash
bmike1@c521 ~ $ grep -E 'bmike1:' /etc/passwd
bmike1:x:1000:1000:Michael Havens,,,:/home/bmike1:/bin/bash
bmike1@c521 ~ $ grep -E 'bmike1$:' /etc/passwd
bmike1@c521 ~ $ grep -E 'bmike1$' /etc/passwd
bmike1@c521 ~ $
:-)~MIKE~(-:
On Fri, Mar 6, 2015 at 11:39 PM, der.hans <[email protected]> wrote:
Am 06. Mär, 2015 schwätzte Michael Havens so:
moin moin Mike,
when using regular expressions '$' matches the end of the line and '^'
matcheѕ the beginning of the line. So, '^$' matches a blank line.
grep -E '^fred:' /etc/passwd # shows the entry for fred's account
grep -E ':/bin/bash$' /etc/passwd # shows all of the accounts that have
bash as their shell
ciao,
der.hans
I'm going through the BASH manual at The Linux Documentation Project and
was going over special characters. They say that 'a "$" addresses the
end
of a line bash'. Huh; what does that mean? You see on my blog that I had
another special character I was wondering about but my web search
revealed
to me what was hidden. My web search in this case turns up a lot of
stuff
too. None of it relevant though. Could you wonderful people of Plug
remove
the scales from my eyes?
:-)~MIKE~(-:
--
# http://www.LuftHans.com/ http://www.PhxLinux.org/
# "Metrosexuals notwithstanding, quiche still lacks something." --
David Brin
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