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Full Discussion: Variable gets auto updated after function execution
Top Forums UNIX for Beginners Questions & Answers Variable gets auto updated after function execution Post 303036761 by MadeInGermany on Wednesday 10th of July 2019 03:38:44 PM
Old 07-10-2019
grep -q might not work with all grep versions. What is your OS?
Code:
tail -f $UMPath/data/nirvana.log | while read line
do
done

Several problems with that.
The pipe forces the while-do-done block into a sub shell.
  • While the return should work an exit can produces different results, dependent on the shell. BTW what shell and OS do you use?
  • Your main problem: changes on variables are not copied back to the main shell.

Then, if the sub shell terminates, it sends a SIGPIPE to the tail -f that hopefully terminates.
The following eliminates some problems
Code:
# Watch the log file for the initialization string
getline()
{
# use the portable printf in favor of echo -e
printf "\nNow watching nirvana log for the Started Nirvana Realm string"
# tail -f will hopefully terminate
tail -f $UMPath/data/nirvana.log |
# the pipe forces the while-do-done into a sub shell:
# variables are not returned but a return value should work
while read line
do
    case "$line" in
    *"Realm Server Startup sequence completed"*)
        printf "\nFound: %s\n\n" "$line"
        return 0
    ;;
    *"Server shutdown"*)
        printf "\nFound: %\n\n" "$line"
        return 1
    ;;
    esac
done
}
# act on the return value
if getline
then
    echo "UM is now up and running"
else
    echo "UM failed to start. Please check"
    rval=1
fi
exit $rval

 

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LEARN ABOUT DEBIAN

kumoctl

KUMOCTL(1)						      General Commands Manual							KUMOCTL(1)

NAME

       kumoctl - show kumofs status

SYNOPSIS

       kumoctl address[:port=19750] command [options]

DESCRIPTION

       Show status of kumo-manager and send control commands to kumo-manager.

COMMANDS

       status show status of the cluster

       attach attach all new servers and start replace

       attach-noreplace
	      attach all new servers

       detach detach all fault servers and start replace

       detach-noreplace
	      detach all fault servers

       replace
	      start replace without attach/detach

       full-replace
	      start full-replace (repair consistency)

       backup [suffix=20090304]
	      create backup with specified suffix

       enable-auto-replace
	      enable auto replace

       disable-auto-replace
	      disable auto replace

STATUS

       hash space timestamp
	      The  time  that the list of attached kumo-servers is updated. It is updated when new kumo-server is added or existing kumo-server is
	      down.

       attached node
	      The list of attached kumo-servers. (active) is normal node and (fault) is fault node or recoverd but not re-attached node.

       not attached node
	      The list of recognized but not-attached nodes.

AUTO REPLACING

       By default, you have to attach new kumo-servers manually using kumoctl command. If the auto replacing  is  enabled,  new  kumo-servers  are
       attached automatically.	This is experimental feature.

EXAMPLE

       $ kumoctl mgr1 status

       $ kumoctl mgr1 attach

SEE ALSO

       kumo-manager(1).

kumoctl 							     July 2009								KUMOCTL(1)
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