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Full Discussion: Exit to while read
Top Forums Shell Programming and Scripting Exit to while read Post 303007100 by Scott on Saturday 11th of November 2017 11:46:14 AM
Old 11-11-2017
Well, if you want to monitor the log, it doesn't make much sense to exit (or break) at all.

Code:
tail -fn0 test.log | while read line; do
if [[ "$line" =~ "Pattern1" ]]; then
  # do something here
  echo $line >> test2.log
elif [ "$line" =~ "Pattern2" ]; then
  # do something else here
  echo $line >> test2.log
  fi
done

(ideally this is something you would likely run nohup in the background)
 

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LOGGER(1)						      General Commands Manual							 LOGGER(1)

NAME
logger - make entries in the system log SYNOPSIS
logger [ -t tag ] [ -p pri ] [ -i ] [ -f file ] [ message ... ] ARGUMENTS
-t tag Mark every line in the log with the specified tag. -p pri Enter the message with the specified priority. The priority may be specified numerically or as a ``facility.level'' pair. For example, ``-p local3.info'' logs the message(s) as informational level in the local3 facility. The default is ``user.notice.'' -i Log the process id of the logger process with each line. -f file Log the specified file. message The message to log; if not specified, the -f file or standard input is logged. DESCRIPTION
Logger provides a program interface to the syslog(3) system log module. A message can be given on the command line, which is logged immediately, or a file is read and each line is logged. EXAMPLES
logger System rebooted logger -p local0.notice -t HOSTIDM -f /dev/idmc SEE ALSO
syslog(3), syslogd(8) 4.3 Berkeley Distribution September 17, 1985 LOGGER(1)
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