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Full Discussion: Grep remote multiple hosts output to local server
Top Forums Shell Programming and Scripting Grep remote multiple hosts output to local server Post 303039059 by charli1 on Saturday 21st of September 2019 12:55:11 PM
Old 09-21-2019
[Solved]Grep remote multiple hosts output to local server
Hello all,
i'm trying to create a report by greping a pattern on multiple remote hosts and creta a simple report,
actually i did this, is ther any better way to do this.
Code:
#!/bin/bash
for host in `cat RemoteHosts`
do
  ssh $host -C 'hostname 2>&1; grep ERROR /var/log/WebServer.log.2019-09-21 | wc -l' >> output
done
# joining each two lines together with single tab between
sed 'N;s/\n/ /' output > JoinedLinesReport.csv
#removing old output file
rm -f output

The report with the above script is the following,
Code:
server1   1345
server2 2345

Is there any way to create it like this?
Code:
HostName Count
server1	        1345
server2	        2345

EDIT: added a new sed to add the line i need.
Thanks any way.
Code:
sed -i '1s/^/HostName Count\n/'  JoinedLinesReport.csv

Last edited by Scrutinizer; 09-21-2019 at 03:28 PM.. Reason: Added code tags ....
This User Gave Thanks to charli1 For This Post:
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LEARN ABOUT ULTRIX

rhosts

rhosts(5)							File Formats Manual							 rhosts(5)

Name
       rhosts - list of hosts that are logically equivalent to the local host

Syntax
       /$HOME/.rhosts

Description
       The  file  allows  a  user  who has an account on the local host to log in from a remote host without supplying a password.  It also allows
       remote copies to the local host.

       If the file exists, it is located in a user's home directory.  It is not a mandatory file, however.

       The format of a file entry is:
       hostname [username]
       The hostname is the name of the remote host from which the user wants to log into the local host.  The username is the user's login name on
       the remote host.  If you do not specify a user name, the user must have the same login name on both the remote and local hosts.

       The  host  names  listed in the file may optionally contain the local BIND domain name.	For more information on BIND, see the Guide to the
       BIND/Hesiod Service.

       If a user is logged in to and wants to log in to a host called without supplying a password, she must:

       o    Have an account on

       o    Create a file in her home directory on

       o    Specify host1 ginger as an entry in the file.
	    If has the same login on both and she can simply specify host1 in her entry.  You can allow the superuser of a remote system to log in
	    to your system without password protection or perform a remote copy by having a file in the root ( / ) directory, but it is not recom-
	    mended.
	    In addition to having a file, the superuser needs a terminal entry in the file for each pseudoterminal configured in the system.   The
	    secure entry looks similar to the following:
	    ttyp3      none    network	       secure
	    See the reference page for more information.

Examples
       The  following is a sample file for the user It is located in her home directory on She also has accounts on the hosts called and Her login
       name on and is the same as on but her login on is

       To enable to log in to from and without supplying a password, her on should contain the following entries:
       machine1
       system1	gordon
       host3

See Also
       hosts.equiv(5), ttys(5)
       Introduction to Networking and Distributed System Services

																	 rhosts(5)
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