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Full Discussion: [bash help]Adding multiple lines of text into a specific spot into a text file
Top Forums Shell Programming and Scripting [bash help]Adding multiple lines of text into a specific spot into a text file Post 302401396 by cdn_humbucker on Saturday 6th of March 2010 12:07:48 AM
Old 03-06-2010
[bash help]Adding multiple lines of text into a specific spot into a text file
I am attempting to insert multiple lines of text into a specific place in a text file based on the lines above or below it.

For example, Here is a portion of a zone file.
Code:
                IN      NS      ns1.domain.tld.
                IN      NS      ns2.domain.tld.
                IN      NS      ns3.domain.tld.
                IN      NS      ns4.domain.tld.

        IN    A    255.255.255.255

I need to add 4 lines of MX records in between the final NS record and the first A record, and still leave 1 line of white space between each, so that it looks like this:
Code:
                IN      NS      ns1.domain.tld.
                IN      NS      ns2.domain.tld.
                IN      NS      ns3.domain.tld.
                IN      NS      ns4.domain.tld.

                 IN      MX      mx1.domain.tld.
                 IN      MX      mx2.domain.tld.
                 IN      MX      mx3.domain.tld.
                 IN      MX      mx4.domain.tld.

        IN    A    255.255.255.255

I've checked the other posts which have to do with inserting text into a file, and it seems like this can be done with some iteration of sed, but I'm not sure where to begin. the other examples of this kind of situation on this forum seemed to be dealing mostly with specific line numbers, or a static value to insert the line after. Where in this situation, the final NS record will change, and the amount of NS lines will change from zone file to zone file, so the only static value is the IN NS.

any help anyone can offer with this is greatly appriciated.
 

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LEARN ABOUT PLAN9

more

MORE(1) 							   User Commands							   MORE(1)

NAME

       more - file perusal filter for crt viewing

SYNOPSIS

       more [options] file...

DESCRIPTION

       more is a filter for paging through text one screenful at a time.  This version is especially primitive.  Users should realize that less(1)
       provides more(1) emulation plus extensive enhancements.

OPTIONS

       Options are also taken from the environment variable MORE (make sure to precede them with a dash (-)) but command-line options  will  over-
       ride those.

       -d     Prompt  with "[Press space to continue, 'q' to quit.]", and display "[Press 'h' for instructions.]" instead of ringing the bell when
	      an illegal key is pressed.

       -l     Do not pause after any line containing a ^L (form feed).

       -f     Count logical lines, rather than screen lines (i.e., long lines are not folded).

       -p     Do not scroll.  Instead, clear the whole screen and then display the text.  Notice that this option is switched on automatically	if
	      the executable is named page.

       -c     Do not scroll.  Instead, paint each screen from the top, clearing the remainder of each line as it is displayed.

       -s     Squeeze multiple blank lines into one.

       -u     Suppress underlining.

       -number
	      The screen size to use, in number of lines.

       +number
	      Start displaying each file at line number.

       +/string
	      The string to be searched in each file before starting to display it.

       --help Display help text and exit.

       -V, --version
	      Display version information and exit.

COMMANDS

       Interactive  commands  for more are based on vi(1).  Some commands may be preceded by a decimal number, called k in the descriptions below.
       In the following descriptions, ^X means control-X.

	      h or ?	Help; display a summary of these commands.  If you forget all other commands, remember this one.

	      SPACE	Display next k lines of text.  Defaults to current screen size.

	      z 	Display next k lines of text.  Defaults to current screen size.  Argument becomes new default.

	      RETURN	Display next k lines of text.  Defaults to 1.  Argument becomes new default.

	      d or ^D	Scroll k lines.  Default is current scroll size, initially 11.	Argument becomes new default.

	      q or Q or INTERRUPT
			Exit.

	      s 	Skip forward k lines of text.  Defaults to 1.

	      f 	Skip forward k screenfuls of text.  Defaults to 1.

	      b or ^B	Skip backwards k screenfuls of text.  Defaults to 1.  Only works with files, not pipes.

	      ' 	Go to the place where the last search started.

	      = 	Display current line number.

	      /pattern	Search for kth occurrence of regular expression.  Defaults to 1.

	      n 	Search for kth occurrence of last regular expression.  Defaults to 1.

	      !command or :!command
			Execute command in a subshell.

	      v 	Start up an editor at current line.  The editor is taken from the environment variable VISUAL if  defined,  or	EDITOR	if
			VISUAL is not defined, or defaults to vi if neither VISUAL nor EDITOR is defined.

	      ^L	Redraw screen.

	      :n	Go to kth next file.  Defaults to 1.

	      :p	Go to kth previous file.  Defaults to 1.

	      :f	Display current file name and line number.

	      . 	Repeat previous command.

ENVIRONMENT

       The more command respects the following environment variables, if they exist:

       MORE   This variable may be set with favored options to more.

       SHELL  Current shell in use (normally set by the shell at login time).

       TERM   The terminal type used by more to get the terminal characteristics necessary to manipulate the screen.

       VISUAL The editor the user prefers.  Invoked when command key v is pressed.

       EDITOR The editor of choice when VISUAL is not specified.

SEE ALSO

       less(1), vi(1)

AUTHORS

       Eric Shienbrood, UC Berkeley
       Modified by Geoff Peck, UCB to add underlining, single spacing
       Modified by John Foderaro, UCB to add -c and MORE environment variable

HISTORY

       The  more command appeared in 3.0BSD.  This man page documents more version 5.19 (Berkeley 6/29/88), which is currently in use in the Linux
       community.  Documentation was produced using several other versions of the man page, and extensive inspection of the source code.

AVAILABILITY

       The more command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux							   February 2014							   MORE(1)
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