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Top Forums Shell Programming and Scripting How to read a dynamically changing file Post 302623857 by Scrutinizer on Sunday 15th of April 2012 12:59:32 AM
Old 04-15-2012
I got your point, but you had not posted what you tried up to this point. tail -f cannot be used that way since it is never ending. Try this approach:
Code:
tail -f logfile |
while IFS= read -r line
do
  ...
done > test.out


Last edited by Scrutinizer; 04-15-2012 at 02:21 AM..
 

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MTAIL(1)							   User Commands							  MTAIL(1)

NAME
mtail - tail variant designed for web developers monitoring logfiles SYNOPSIS
mtail [options] <file>... DESCRIPTION
MonkeyTail allows a user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the output whenever a pause in output over 3 seconds is detected. MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo. OPTIONS
-q Quiet mode --quiet " " -n Output the last N lines of each file before tailing (defaults to 0) <file>... Files to tail. These can specified in the following ways: @<groupname> - expands the group (from .mtailrc) to a list of files to tail <filename> - tails a local file. +<filename> - attempts to sudo and tail a local file (will prompt for pwd if required). <remotehost>:<filename> - attempts to invoke tail via ssh on a remote host. +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a remote host (will prompt for pwd if required). SEE ALSO
mtailrc(5), tail(1) AUTHOR
Martyn Smith <martyn@dollyfish.net.nz> mtail May 2008 MTAIL(1)
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