Omitting sections of file that contain word Post: 302708995

Sponsored Content

Top Forums Shell Programming and Scripting Omitting sections of file that contain word Post 302708995 by SkySmart on Tuesday 2nd of October 2012 01:06:02 PM

10-02-2012

Registered User

Quote:

Originally Posted by Corona688

That is a useless use of cat. awk, or any other shell command, does not need cat's help to read a single file.

If you set awk's record separator to blank, it will take blank lines to be the separators between records here:

Code:

awk -v RS="" -F"\n" '{ P=1
        for(N=1; N<=NF; N++) if($N ~ /hostgroup_name[ \t]*$/) P=0 } P' inputfile

this seems to work marvelously. the problem is, it also removes chunks that has "host_name".

if the code you provided finds a section that looks something like this:

Code:

define service {
        check_command                   check_proc!syslog
        hostgroup_name
        host_name                        sky-01.smart.net,sky-02.smart.net
        service_description             Check Syslog
        use                             process-service
}

i want it to only delete the line that has the "hostgroup_name" on it. meaning, if hostgroup_name is empty, but the host_name is not, then, delete line containing hostgroup_name and still output the chunk (but with the hostgroup_name line deleted).

however, if both hostgroup_name AND host_name are empty, then OMIT the entire chunk.

there will be chunks where "hostgroup_name" is defined, but "host_name" is not. and vice versa.

SkySmart

View Public Profile for SkySmart

Find all posts by SkySmart

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

omitting lines from file A that are in file B

I've got file A with (say) 1M lines in it ... ascii text, space delimited ... I've got file B with (say) 10M lines in it ... same structure. I want to remove any lines from A that appear (identically) in B and print the remaining (say) 900K lines. (And I want to do it in zero time of...

2. UNIX for Advanced & Expert Users

extract multiple sections of a file

I have a file that I need to parse multiple sections from the file. The file contains multiple lines that start with ST (Abunch of data) Then the file contains multiple lines that start with SE (Abunch of data) SE*30*0001 ...

3. Shell Programming and Scripting

extract multiple sections of file

4. Shell Programming and Scripting

Best way to remove sections of text from a file

Greetings! I found this fourm via a google search on "sed expressions". I have a file that contains notices and they are all the same length in lines. For example the file would contains 15 notices, each being 26 lines each. I need some way to eliminate notices that contain a "S" in a particular...

5. Shell Programming and Scripting

Parsing file, yaml file? Extracting specific sections

Here is a data file, which I believe is in YAML. I am trying to retrieve just the 'addon_domains" section, which doesnt seem to be as easy as I had originally thought. Any help on this would be greatly appreciated!! I have been trying to do this in awk and mostly bash scripting instead of perl...

6. Shell Programming and Scripting

Remove sections of a xml file with sed

I've been trying to remove some lines of a xml file that looks like this: <parent> <child>name1</child> <lots_of_other tags></lots_of_other_tags> </parent> <parent> <child>name2</child> <lots_of_other tags></lots_of_other_tags> </parent> <parent> <child>name3</child> ...

7. Shell Programming and Scripting

Modify sections of the line in a file

Hello.. I have a line in a file which I have to edit: the line looks like: <!]> Sometimes, the section of the line can have only one entry for cn, or maybe more than 2 like below: <!]> I have a variable which has the following value: CN="(cn=MNO)(cn=XYZ)" I need to replace the part...

8. Shell Programming and Scripting

How to edit file sections that cross multiple lines?

Hello, I'm wondering where I could go to learn how to edit file sections that cross multiple lines. I'm wanting to write scripts that will add Gnome menu entries for all users on a system for scripts I write, etc. I can search an replace simple examples with sed, but this seems more complex. ...

9. Programming

extract different sections of a file

Hi All, I have a file with the data 10;20;30;40;50;60;70;80;123;145;156;345. the output i want is the first fourth sixth elements and everything from there on. How do i achieve this.

10. Shell Programming and Scripting

awk removing sections of a file

I have a file that looks liek this (see below). can somebody provide me with and awk or sed command that can take a piece of the file starting from the time to the blank line and put in into another file. For example: How would I get the data from 10:56:11 to the blank line. Two things: ...

LEARN ABOUT SUSE

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)