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Full Discussion: Add comment if not present
Top Forums Shell Programming and Scripting Add comment if not present Post 302928335 by anil510 on Thursday 11th of December 2014 05:09:24 AM
Old 12-11-2014
Add comment if not present

I have a file

Code:
cat /root/file
#import node1
#import node2
import node2
import node4

After sed/awk operation the file should be as follows

Code:
cat /root/file
#import node1
#import node2
#import node2
#import node4

I was able to retrieve the #import, but not able to place comment in missing lines.
Code:
[root@server node]# cat /root/file  |  egrep  -o "[^ ]+import"
#import
#import

 

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ssh-import-id(1)						    ssh-import							  ssh-import-id(1)

NAME
ssh-import-id - retrieve one or more public keys from a public keyserver (Launchpad.net by default) and append them to the current user's authorized_keys file (or some other specified file) SYNOPSIS
ssh-import-id [options] USER_ID_1 [USER_ID_2] ... [USER_ID_n] OPTIONS
-h | --help usage -o | --output F write output to file 'F' (default ~/.ssh/authorized_keys, use "-" for standard out) DESCRIPTION
This utility will securely contact a public keyserver (https://launchpad.net by default) and retrieve one or more user's public keys, and append these to the current user's ~/.ssh/authorized_keys file. The system administrator can change the source URL used by ssh-import-id(1) by editing the configuration file, /etc/ssh/ssh_import_id, which is sourced to obtain the value of URL. By default, URL="https://launchpad.net/~%s/+sshkeys". Note that this url really MUST be a secure, https url with a valid, signed certificate or else your system will be vulnerable to man-in-the-middle attacks! The "%s" will be populated by ssh-import-id(1) with the value(s) of USER_ID_1 [USER_ID_2] ... [USER_ID_n]. SEE ALSO
ssh(1) FILES
/etc/ssh/ssh_import_id AUTHOR
This manpage and the utility was written by Dustin Kirkland <kirkland@canonical.com> for Ubuntu systems (but may be used by others). Per- mission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. ssh-import 23 Feb 2010 ssh-import-id(1)
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