Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Bash - here document on RHEL 6.8 and 6.9 servers aren't working
Top Forums UNIX for Beginners Questions & Answers Bash - here document on RHEL 6.8 and 6.9 servers aren't working Post 303040553 by greavette on Thursday 31st of October 2019 11:50:49 AM
Old 10-31-2019
Bash - here document on RHEL 6.8 and 6.9 servers aren't working
H Forum,

I was thankful in getting help from this post that allowed me to connect to multiple severs at once using here documents to gather data into variables. But I've discovered that the same bash command that works on my RHEL 7 servers do not work on RHEL 6? What's strange about my problem is that I'm not getting an error either. The problem is that the variables return empty when I try the following code on RHEL 6.8 or 6.9 servers we manage:

Code:
IFS=$'\t' read FLAVOUR HOSTNAME ACTIVE_KERNEL INACTIVE_KERNEL UPTIME <<- EOFREAD
        $ssh -qo StrictHostKeyChecking=no -o ConnectTimeout=1 user@$InputIP sudo -u user sh -s <<- EOFSSH | tr $'\n' $'\t'
        exec bash
        cat /etc/redhat-release 2>/dev/null || lsb_release -a 2>/dev/null | grep Description | cut -f2
        awk -F= '/^NAME/{print $2}' /etc/os-release 2>/dev/null || grep Red |cat /etc/redhat-release 2>/dev/null || lsb_release -a 2>/dev/null | grep Description | cut -f2
        hostname
        uname -r
        rpm -qa | grep '^kernel-[0-9]' |grep -vE `uname -r` | paste -sd \; || echo "Can't List Ubuntu Kernels"
        uptime | cut -d "," -f1
        exit
EOFSSH
        )
EOFREAD

I've thought of adding in the ability to determine if my server is RHEL 6 or 7 using code like the following:

python -mplatform | grep -qi red &&

but even if I could determine RHEL version I'm still not sure why my RHEL 6 servers do not return variable data back. I've tested this above code connecting to just one server to try and triage the issue. No errors are returned. the variable fields are just empty. Whereas on my RHEL 7 servers I return back variables with no issue. Could it be that how I use Here Documents just doesn't work with RHEL 6 servers? has anyone seen this before?

I've also tested connecting to a RHEL 6 server multiple times to get the data I need. what I mean by this is instead of connecting to a RHEL 6 server once and collecting data I've tested connecting to a RHEL 6 for each command I need so connecting multiple times and there are no issues with the above commands I'm issuing.

Perhaps I'll just need to identify RHEL 6 servers and gather their data differently than I do for RHEL 7 severs but before I do that I thought I would check this forum for any advice first.

Thank you.
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

here document not working

I tried doing ftp myhost <<HERE username password quit HERE but it doesnt work. Why? When I do ftp host, I always get prompted for username, and once I type that in I get prompted for password. But when I try doing it from here document it freezes. (2 Replies)
Discussion started by: JamesByars
2 Replies

2. Red Hat

Who can give me a document for configure nagios on RHEL 5

Who can give me a document for configure nagios on RHEL 5,thanks . (1 Reply)
Discussion started by: zhengsenlin
1 Replies

3. Red Hat

cfengine / puppet for rhel servers

Hello all, I am planning to deploy a configuration / auditing software package for about 100 new nodes that we are planning to install. I am hearing many good things in regards to cfengine and puppet. Can someone shed some light in regards to these solutions? Thanks, jaysunn (1 Reply)
Discussion started by: jaysunn
1 Replies

4. Shell Programming and Scripting

sudo inside a here document not working

Have a sudo statement inside of a here document. It prompts me for a password, but doesnt wait for me to enter my password. Is there a way I can use the command without sudo or anyway that I can enter the password correctly? Eg : while read remotehost do ssh -t $2@$remotehost <<REMOTE... (13 Replies)
Discussion started by: mnanavati
13 Replies

5. Shell Programming and Scripting

RHEL - Shell Script not working

Hello Unix Mates I have a problem my script is not working, can anyone tell what is rung with it? #!/bin/sh wget "http://download.divx.com/labs/divx611-20060201-gcc4.0.1.tar.gz" tar zxf divx611-20060201-gcc4.0.1.tar.gz ./divx611-20060201-gcc4.0.1/install.shError: -2010-11-28 21:25:06-- ... (1 Reply)
Discussion started by: camper
1 Replies

6. Red Hat

RHEL 6 plain telnet & ftp servers

I am being pushed from AIX onto RHEL 6 and after our first 'chuck it on' install, I have a problem. Where is the old (okay insecure) telnet & ftp server? I know that they are probably regarded as archaic now, but the source servers do not have the SSH tools, so I've got to somehow transfer the... (4 Replies)
Discussion started by: rbatte1
4 Replies

7. Red Hat

Network Teaming not working in RHEL/CentOS 7

I was testing Networking Teaming (activebackup) with a VM hosted on VmWare Workstation and VirtualBox, and the result is, if the active interface is down, the system is not using the backup interface. Tested on both CentOS / RHEL 7 Please find below the command I have used to configure teaming.... (0 Replies)
Discussion started by: atanubanerji
0 Replies

8. Red Hat

RHEL 7.1 autofs permissions do not match NFS servers

RHEL 7.1 client using autofs to mount a NIS map of home directories being exported by a Solaris 10x86 nfs server. The owner and group are correct on the NFS server, but on the RHEL client, the owner and group end up being nobody nobody. The USERS and GROUPS are NIS maps as well. They are... (2 Replies)
Discussion started by: mrmurdock
2 Replies

9. UNIX for Advanced & Expert Users

Syslog-ng not working not collecting logs on rhel

Hi, I need help on syslog-ng on RHEL 7.2. It is working as expected. As per configuration, it is supposed to create authlog, messages and xymessages daily in respective folder of date. But I can see only messages file and that is also not updating well. # ps -ef | grep -i syslog root 22954... (1 Reply)
Discussion started by: solaris_1977
1 Replies

LEARN ABOUT CENTOS

ksc

KSC(1)								   User Commands							    KSC(1)

NAME

       ksc - Linux kernel module source checker

SYNOPSIS

       ksc [ -d | --directory ] DIRECTORY

       ksc [ -k | --ko ] FILE

OPTIONS

       KSC   accepts  command-line  arguments,	and  has  both	a  long and short form usage.  You can use either style or combine them to specify
       options. When the tool is run with kernel module sources it checks for all four architectures, and when run with binary kernel modules,	it
       checks for the specific architecture for which the binary was built.
       Valid RHEL whitelist releases are rhel6.0, rhel6.1, rhel6.2, rhel6.3, rhel6.4

       -h, --help
	      show this help message and exit

       -c CONFIG, --config=CONFIG
	      path  to	the  local  ksc.conf file. If not specified the tool tries to read from ~/ksc.conf and if that is also not found then from
	      /etc/ksc.conf

       -d DIRECTORY, --directory=DIRECTORY
	      path to the directory

       -i, --internal
	      to create text files to be used internally.

       -k KO, --ko=KO
	      path to the ko file.  You should either  use -d or -k to run the KSC tool, but not both.	If both -d and -k option is  used  at  the
	      same time then only -d is used and the -k option is discarded.

       -n RELEASENAME, --name=RELEASENAME
	      Red Hat release against which the bug is to be filed. Default value is 6.5

       -p PREVIOUS, --previous=PREVIOUS
	      path to the previous resultset file and submit it as a bug to Red Hat Bugzilla.

       -r RELEASE, --release=RELEASE
	      RHEL whitelist release used for comparison

       -s, --submit
	      Submits the report to the Red Hat bugzilla (https://bugzilla.redhat.com).  The credentials need to be in the /etc/ksc.conf file. The
	      tool will prompt for bugzilla password.

	      The configuration file looks like below:

	      [bugzilla]
	      user=user@redhat.com
	      partner=partner-name
	      partnergroup=partner-group
	      server=https://bugzilla.redhat.com/xmlrpc.cgi

       -v, --version
	      Prints KSC version number

ksc - Version 0.9.11						     Feb 2014								    KSC(1)
All times are GMT -4. The time now is 02:14 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy