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Top Forums Shell Programming and Scripting How to tail -f logfile. if log file is generate every 1 HR.? Post 302830815 by balajesuri on Tuesday 9th of July 2013 02:18:59 PM
Old 07-09-2013
1. Have a symbolic link point to the current hour log file.
2. Put a job in the hourly cron that will re-initialise the link to the current hour log file after every hour.

As an example, lets say CybertonTransaction.log is a symlink that points to current hour log file, say CybertonTransaction.20130709-22.log. After the time changes to 23:00 hrs, the cron job should re-link CybertonTransaction.log to CybertonTransaction.20130709-23.log.

And as a tip: If you're going to view the tail-ed output for hours together, use tail -F CybertonTransaction.log - tail with uppercase 'F' the symlink.
 

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LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.42.9 December 2013 LOGSAVE(8)
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