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Linux Bash remove last character from a string

str="Sample String"
echo "${str%?}"


will give a result: Sample Strin

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Sending Jboss Server Logs to Logstash Using Filebeat with Multiline Support

In addition to sending system logs to logstash, it is possible to add a prospector section to the filebeat.yml for jboss server logs. Sometimes jboss server.log has single events made up from several lines of messages. In such cases Filebeat should be configured for a multiline prospector.
Filebeat takes lines do not start with a date pattern (look at pattern in the multiline section "^[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}" and negate section is set to true) and combines them with the previous line that starts with a date pattern.

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