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Output of a command in a shell script

When you want to assign output of a shell command to a variable in your shell script, you have to write shell command between special quotation marks ` <command here> `

example: This command shows oldest two backups.
old_backups=`ls -td backup* | awk 'NR>2'`
echo $old_backups

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Sending Jboss Server Logs to Logstash Using Filebeat with Multiline Support

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server.log file excerpt where DatePattern: yyyy-MM-dd-HH and ConversionPattern: %d %-5p [%c] %m%n
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