Topic 'grep (awk, sed) help' in forum 'All Things Unix' - dslreports.com http://www.dslreports.com/forum/grep-awk-sed-help-27625994 en Fri, 24 May 2013 14:01:31 EDT Fri, 24 May 2013 14:01:31 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27631219 See Profile as offline, I mentioned the same Brano See Profile ... :)

Incidentally, the issue why my sed script wasn't working was resolved. The Regular Expression Brano See Profile used didn't cover the input file. :)

Cheers,
-pablo
--
openSUSE 12.2/KDE 4.x
ISP: TekSavvy Bonded DSL; backhauled via a 6KM wireless link
Assorted goodies: »pablo.blog.blueoakdb.com]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27631219 Wed, 17 Oct 2012 09:22:07 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27631162 myfilter) that if made executable can be executed directly. I takes the same parameters as awk, so if invoked myfilter input.txt it will filter the input.txt file and put the filtered output on the standard output. Pipe or redirect as you wish ;).

--
Keep It Safe, Stupid!
Yes, I CanChat. Can You?]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27631162 Wed, 17 Oct 2012 09:07:32 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629929
Thx!
-pablo]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629929 Tue, 16 Oct 2012 21:50:44 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629852
The awk posted by Black Box See Profile and the sed posted by Uraki See Profile are doing what I need.
pablo See Profile your is not producing desired output (or I'm doing something wrong).

In any case, mission accomplished, thank you all for help.]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629852 Tue, 16 Oct 2012 21:32:50 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629741 www.theunixschool.com/2012/06/se···-or.html

Check out #23 in the list, exactly what you want, I think.]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27629741 Tue, 16 Oct 2012 21:03:06 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627981
You're welcome ... as a gentle reminder, invoke the sed script using the `-n' parameter: sed -n -f the-script-file file-1 ... file-N

:)

Cheers!
-pablo
--
openSUSE 12.2/KDE 4.x
ISP: TekSavvy Bonded DSL; backhauled via a 6KM wireless link
Assorted goodies: »pablo.blog.blueoakdb.com]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627981 Tue, 16 Oct 2012 13:16:56 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627836
FYI: My pattern is never on 1st line so the generic sed should just do perfectly, I'll test it later.]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627836 Tue, 16 Oct 2012 12:45:10 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627800
As always, Linux/Unix has many filters to solve the same issue. :)

Here's a solution using sed.

Suppose we have the following text file ....

BOOabBOOxyzBOOblackbluegreenBOO

The following "sed" script would remove BOO and the preceding line:

sed code:
#
# Handle the special case when our token is on line 1.
#
/^BOO$/d
 
#
# This is the generic case for line 2 .. N
#
/^.*$/{
   N
   /.*\nBOO$/d
   P
   D
}

--
openSUSE 12.1/KDE 4.x
ISP: TekSavvy Bonded DSL; backhauled via a 6KM wireless link
Assorted goodies: »pablo.blog.blueoakdb.com]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27627800 Tue, 16 Oct 2012 12:36:17 EDT Re: grep (awk, sed) help http://www.dslreports.com/forum/Re-grep-awk-sed-help-27626515
awk code:
#!/usr/bin/awk -f                                                             
 
BEGIN {
    prev = ""
    skip = "YES"
}
 
{
    if (/mypattern/) {
        skip = "YES"
    } else {
        if ("NO" == skip) {
            print prev
        }
 
        prev = $0
        skip = "NO"
    }
}
 
END {
    if ("NO" == skip) {
        print prev
    }
}
]]> http://www.dslreports.com/forum/Re-grep-awk-sed-help-27626515 Tue, 16 Oct 2012 00:41:30 EDT grep (awk, sed) help http://www.dslreports.com/forum/grep-awk-sed-help-27625994 not display that line and line immediately before the matched line?

For the one line I can do grep -v mypattern myfile ... works for the one line.
I can match the previous line with grep -B1 mypattern myfile ... but how can I combine these two expressions?

If line is matching mypattern don't output the line and don't output the line just before the matched line.

I'd like to stay with shell tools i.e. grep, awk, sed (no perl, no python).

Thank you!!!
]]> http://www.dslreports.com/forum/grep-awk-sed-help-27625994 Mon, 15 Oct 2012 20:50:34 EDT