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Full Discussion: Gnu tool; sed awk echo etc to prepend or append string to a file
Top Forums Shell Programming and Scripting Gnu tool; sed awk echo etc to prepend or append string to a file Post 302992316 by bash_in_my_head on Thursday 23rd of February 2017 04:19:39 PM
Old 02-23-2017
Gnu tool; sed awk echo etc to prepend or append string to a file
Looking to add text to a file, example

File example;
Code:
nodegroups:
  check-hosts: L@host.domain.com,host2.domain.com,host3.domain.com

I need to take a file with a one line list of hosts separated by commas

Code:
host.domain.com,host2.domain.com,host3.domain.com

and prepend the string " check-hosts: L@" to the line of hosts above (line 2). I need to have two spaces before "check-hosts: L@"
My approach has been to prepend the string " check-hosts: L@" to the file containing the line of hosts. but I am open to other ways as long as I can use the file that contains a list of hosts as the starting poing.

Line 1 nodegroups: needs to be above line 2 in my example.
 

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LEARN ABOUT REDHAT

mknetid

MKNETID(8)							 Reference Manual							MKNETID(8)

NAME

       mknetid - generate data for netid map

SYNOPSIS

       /usr/lib/yp/mknetid [ -q ] [ -h hosts ] [ -p passwd ] [ -g group ] [ -d domain ] [ -n netid ]

       /usr/lib/yp/mknetid --version

DESCRIPTION

       mknetid	generates  the netid.byname NIS map from the contents of the group(5), passwd(5), hosts(5) and netid files. It checks for multiple
       entrys of netids and warn for them or filters them out. It is only called by /var/yp/Makefile when rebuilding the NIS map.

OPTIONS

       -q     This flag turns on 'quiet' mode, don't print a warning message when finding an duplicate netid entry.

       -h hosts
	      The -h flag can be used to specify the use of another hosts file than the default /etc/hosts.

       -p passwd
	      The -p flag can be used to specify the use of another passwd file than the default /etc/passwd.

       -g group
	      The -g flag can be used to specify the use of another group file than the default /etc/group.

       -n netid
	      The -n flag can be used to specify the use of another netid file than the default /etc/netid.

       -d domain
	      The mknetid command uses the system domainname by default. If it is not set or you whish to override it, you must use the -d parame-
	      ter.

       --version
	      Prints the version number

FILES

       /etc/group	   groups file
       /etc/hosts	   hosts database
       /etc/netid	   netname database
       /etc/passwd	   password file

SEE ALSO

       passwd(8), group(5), hosts(5), passwd(5)

AUTHOR

       mknetid was written by Thorsten Kukuk <kukuk@suse.de>.

YP Server							    August 2001 							MKNETID(8)
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