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Full Discussion: Remote while IFS
Top Forums Shell Programming and Scripting Remote while IFS Post 302913704 by LinuxRacr on Tuesday 19th of August 2014 12:29:53 PM
Old 08-19-2014
Remote while IFS
Hello masters of scripting,

I've been working to develop some basic monitoring scripts. I have solved one problem, but want to know how to solve the other.

I have a script that runs locally to create an output file with the Linux system kernel paramters, preceeded by the system name:

Local Script:
Code:
HOST="$(/bin/hostname)"
KPARMS=$(sysctl -a)
OUTFILE=/var/tmp/sysctl.txt

while IFS= read
do
  echo "${HOST} : ${REPLY}"
done <<< "${KPARMS}" > ${OUTFILE}

An example snippet of the output from the local /var/tmp/sysctl.txt is as follows:


Code:
server1 : sunrpc.max_resvport  =  1023
server1 : sunrpc.min_resvport  =  665
server1 : sunrpc.tcp_slot_table_entries  =  16
server1 : sunrpc.udp_slot_table_entries  =  16

The problem is that I want to turn this into a remotely-executed script. So far I have the following
Code:
#!/bin/ksh

#HOST="$(/bin/hostname)"
HOST="server1"
KPARMS=$(/sbin/sysctl -a)
OUTFILE=/var/tmp/sysctl.txt

ssh -B ${HOST} "while IFS= read ; do echo \"${HOST} : ${REPLY}\"; done <<< \"${KPARMS}\" > ${OUTFILE} ; cat ${OUTFILE}"

Here is the output from /var/tmp/sysctl.txt on the remote server:
Code:
server1 :

How can I correct this?

Thanks in advance for any insight you can provide.
Last edited by rbatte1; 08-19-2014 at 01:45 PM..
 

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LEARN ABOUT SUSE

sysctl

SYSCTL(8)																 SYSCTL(8)

NAME

       sysctl - configure kernel parameters at runtime

SYNOPSIS

       sysctl [-n] [-e] variable ...
       sysctl [-n] [-e] [-q] -w variable=value ...
       sysctl [-n] [-e] [-q] -p <filename>
       sysctl [-n] [-e] -a
       sysctl [-n] [-e] -A

DESCRIPTION

       sysctl is used to modify kernel parameters at runtime.  The parameters available are those listed under /proc/sys/.  Procfs is required for
       sysctl(8) support in Linux.  You can use sysctl(8) to both read and write sysctl data.

PARAMETERS

       variable
	      The name of a key to read from.  An example is kernel.ostype.  The '/' separator is also accepted in place of a '.'.

       variable=value
	      To set a key, use the form variable=value, where variable is the key and value is the value to set it to.   If  the  value  contains
	      quotes or characters which are parsed by the shell, you may need to enclose the value in double quotes.  This requires the -w param-
	      eter to use.

       -n     Use this option to disable printing of the key name when printing values.

       -e     Use this option to ignore errors about unknown keys.

       -N     Use this option to only print the names. It may be useful with shells that have programmable completion.

       -q     Use this option to not display the values set to stdout.

       -w     Use this option when you want to change a sysctl setting.

       -p     Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.  Specifying - as filename means reading data from
	      standard input.

       -a     Display all values currently available.

       -A     Display all values currently available in table form.

EXAMPLES

       /sbin/sysctl -a

       /sbin/sysctl -n kernel.hostname

       /sbin/sysctl -w kernel.domainname="example.com"

       /sbin/sysctl -p /etc/sysctl.conf

FILES

       /proc/sys /etc/sysctl.conf

SEE ALSO

       sysctl.conf(5)

BUGS

       The -A parameter behaves just as -a does.

AUTHOR

       George Staikos, <staikos@0wned.org>

								    21 Sep 1999 							 SYSCTL(8)
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