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Full Discussion: Script to count matched string then check again from last read position
Top Forums Shell Programming and Scripting Script to count matched string then check again from last read position Post 302990162 by rbatte1 on Monday 23rd of January 2017 07:31:47 AM
Old 01-23-2017
An alternate may be to open the file with tail and keep it open.

What is your overall aim for this process? You might be able to:-
Code:
while read line
do
   process "$line"
done < <(tail -f $logfile)

I think that the < <(command) is a bash construct rather than sh or ksh so it depends if you have that or even if this is appropriate. This process will not end, but continue reading the log file when new records are written, so it's near-time (strictly not quite real-time)

Beware that the log file will remain open, so if you rotate your log files, you might need to use tail -F $logfile instead to open the replacement file.


Can you tell us what the point of this code is to be? There may be a simpler way that I'm not thinking of. It would be useful to know the OS version (output from uname -a) and shell that you are using.



Kind regards,
Robin
 

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LEARN ABOUT HPUX

getdtablesize

getdtablesize(2)						System Calls Manual						  getdtablesize(2)

NAME

       getdtablesize() - get the size of the per-process file descriptor table

SYNOPSIS


DESCRIPTION

       The function returns the maximum number of file descriptors that can currently be stored in a process' file descriptor table.  This maximum
       number is also known as the soft limit for open files, and can be adjusted up to the hard limit by calling The entries  in  the	descriptor
       table are numbered with small integers starting at 0 (zero).

       The  function  returns the total number of file descriptors that a process can have open simultaneously.  Each process is limited to a cur-
       rent maximum (soft limit) and a fixed upper bound (hard limit) of open file descriptors.  This limit is at least  32.   The  system-defined
       limits  are configurable.  See the descriptions of the and kernel parameters in maxfiles_lim(5) and maxfiles(5), respectively, for informa-
       tion about changing the system-defined, per-process limit on open file descriptors.

RETURN VALUES

       The function returns the size of the descriptor table (soft limit), and is always successful.

SEE ALSO

       close(2), getrlimit(2), open(2), select(2), setrlimit(2), sysconf(2), maxfiles(5), maxfiles_lim(5).

STANDARDS CONFORMANCE

																  getdtablesize(2)
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