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Top Forums Shell Programming and Scripting Logfile monitoring with logfile replacement Post 302925254 by Don Cragun on Saturday 15th of November 2014 02:33:39 AM
Old 11-15-2014
The following seems to do what you want:
Code:
#!/bin/ksh
logfile=${1:-logfile}
tail -Fn0 "$logfile" |
while read -r line
do	ls -li "$logfile"
	printf 'Read "%s" from "%s"\n' "$line" "$logfile"
	if [ "$line" = "EOF" ]
	then	echo exiting
		kill 0
	else	echo continuing
	fi
done&

This script terminates when a line containing just EOF is added to your log file.

I use the Korn shell most of the time; this was tested with both ksh and bash. It should work with any POSIX conforming shell.

The kill 0 sends a SIGTERM signal to every process in the current process group (i.e., the shell running the while loop and the tail, so the tail will terminate without waiting for another line to be written to your log file after the EOF line is read).
This User Gave Thanks to Don Cragun For This Post:
 

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cachefslog(1M)															    cachefslog(1M)

NAME
cachefslog - Cache File System logging SYNOPSIS
logfile| cachefs_mount_point DESCRIPTION
The command is used to enable or disable logging for a cachefs_mount_point. When the command is used without any options, it displays the logfile. The logfile contains information on the operation performed on a cachefs_mount_point and statistics used by to get the working set size of cache directory. The specified logfile will contain information for all the CacheFS mount points using the same cache direc- tory. A logfile and a cache directory have a 1-to-1 mapping; that is, even if a cache directory is removed and recreated with the same name, the logfile used in the previous instance of the cache directory cannot be reused with the new cache directory. Enabling logging may have performance impact, even if minimal, on the operations for all the CacheFS mount points using the same cache directory. The command is mainly used for debugging purposes. Options The following options are supported. You must be a superuser to use the and options. Specify the logfile to be used. Halt logging. Operands cachefs_mount_point A mount point of a cache file system. RETURN VALUE
returns the following values: Success. non-zero An error occurred. EXAMPLES
1. Checking the logging of a directory. This example checks if the CacheFS file system is being logged: 2. Changing the logfile. This example changes the logfile of to 3. Verifying the change of a logfile. This example verifies the change of the previous example: 4. Halting the logging of a directory. This example halts logging for the directory: AUTHOR
was developed by Sun Microsystems, Inc. SEE ALSO
cachefsstat(1M), cachefswssize(1M), cfsadmin(1M). cachefslog(1M)
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