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Full Discussion: Assistance to connect to servers via ssh once and collect various commands into separate variables
Top Forums UNIX for Beginners Questions & Answers Assistance to connect to servers via ssh once and collect various commands into separate variables Post 303038881 by RudiC on Monday 16th of September 2019 09:41:38 AM
Old 09-16-2019
You could write a script (local or remote) and execute that, or use "here documents" like

Code:
IFS=$'\t' read FLAVOUR HOSTNAME IPADDRESS ACTIVE_KERNEL INACTIVE_KERNEL UPTIME <<- EOFREAD
        $(ssh -q user@targethost <<- EOFSSH | tr $'\n' $'\t'
        cat /etc/redhat-release 2>/dev/null || lsb_release -a 2>/dev/null | grep Description | cut -f2
        hostname
        hostname -I
        uname -r
        rpm -qa | grep '^kernel-[0-9]' |grep -vE `uname -r`
        uptime | cut -d "," -f1
        EOFSSH
        )
 EOFREAD

Try this to improve readability:
Code:
case "$status" in
        $UNREACHABLE)           OUT="cannot connect";;
        $INVALID_PASSWORD)      OUT="invalid account access";;
        $NO_HOME_DIRECTORY)     OUT="";;
        $PASSWORD_EXPIRED)      OUT="password expired";;
        $SUCCESS)               OUT="successful ssh access";;
esac
echo "$InputHost,\
      $InputIP,\
      $OUT,\
      $Tag,\
      $FLAVOUR,\
      $HOSTNAME,\
      $IPADDRESS,\
      $UPTIME,\
      $ACTIVE_KERNEL,\
      $INACTIVE_KERNEL"

(or use a shell array)


You duplicate the stdin redirection by exec < $SOURCE_FILE before the while loop and then redirecting the loop's stdin again.
Last edited by RudiC; 09-17-2019 at 10:22 AM..
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT LINUX

uptime

UPTIME(1)							Linux User's Manual							 UPTIME(1)

NAME

       uptime - Tell how long the system has been running.

SYNOPSIS

       uptime
       uptime [-V]

DESCRIPTION

       uptime  gives  a one line display of the following information.	The current time, how long the system has been running, how many users are
       currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

       This is the same information contained in the header line displayed by w(1).

       System load averages is the average number of processes that are either in a runnable or uninterruptable state.	A process  in  a  runnable
       state  is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O access, eg waiting for
       disk.  The averages are taken over the three time intervals.  Load averages are not normalized for the number of CPUs in  a  system,  so  a
       load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.

FILES

       /var/run/utmp
	      information about who is currently logged on

       /proc  process information

AUTHORS

       uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu>.

       Please send bug reports to <albert@users.sf.net>

SEE ALSO

       ps(1), top(1), utmp(5), w(1)

Cohesive Systems						    26 Jan 1993 							 UPTIME(1)
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