Generic Filewatcher Post: 302793699

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Top Forums Shell Programming and Scripting Generic Filewatcher Post 302793699 by dikesm on Saturday 13th of April 2013 05:50:23 AM

04-13-2013

Registered User

Quote:

Originally Posted by Corona688

What do a.sh, b.sh, c.sh, d.sh, e.sh do?

What should happen to the input file after the scripts complete?

These config files sound quite similar to makefiles, or could be made so.

The input file is a file containing some data to be processed.The input file would be archived after processing.

The scripts might do simple stuffs like checking whether the source file name is correct as per logic,or check whether there aint any duplication of records in the files,logic to do a data quality check.

These individual scripts run on their own and export some shell variables along with 0 return code in case of success and non zero return code for any failures.

Regards,
Dikesh Shah.

---------- Post updated at 04:50 AM ---------- Previous update was at 04:47 AM ----------

Quote:

Originally Posted by Chubler_XL

You could try something like this, not they after finding a watch file you should probably delete or move it aside to stop actions repeating on every check:

Code:

function load_conf
{
  POS=0
  while read line
  do
     S[POS]="$line"
     let POS=POS+1
  done < $1
}

while read WATCH CONF
do
    POS=${#WF[@]}
    WF[POS]=$WATCH
    CF[POS]=$CONF
done < master

for((i=0;i<${#WF[@]};i++)) {
    if [ -f "${WF[i]}" ]
    then
        load_conf ${CF[i]}
        for((j=0;j<${#S[@]};j++)) {
            echo "${S[j]}" | while read -a run
            do
                for((k=0;k<${#run[@]};k++)) {
                    eval ${run[k]} \> $(basename ${run[k]}).out "2>" $(basename ${run[k]}).stderr &
                }
                wait
            done
        }
    fi
}

Can you please explain what does the above code does?
I am a bit new to complex shell programming.

dikesm

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io::seekable

IO::Seekable(3pm)					 Perl Programmers Reference Guide					 IO::Seekable(3pm)

NAME

       IO::Seekable - supply seek based methods for I/O objects

SYNOPSIS

	   use IO::Seekable;
	   package IO::Something;
	   @ISA = qw(IO::Seekable);

DESCRIPTION

       "IO::Seekable" does not have a constructor of its own as it is intended to be inherited by other "IO::Handle" based objects. It provides
       methods which allow seeking of the file descriptors.

       $io->getpos
	   Returns an opaque value that represents the current position of the IO::File, or "undef" if this is not possible (eg an unseekable
	   stream such as a terminal, pipe or socket). If the fgetpos() function is available in your C library it is used to implements getpos,
	   else perl emulates getpos using C's ftell() function.

       $io->setpos
	   Uses the value of a previous getpos call to return to a previously visited position. Returns "0 but true" on success, "undef" on
	   failure.

       See perlfunc for complete descriptions of each of the following supported "IO::Seekable" methods, which are just front ends for the
       corresponding built-in functions:

       $io->seek ( POS, WHENCE )
	   Seek the IO::File to position POS, relative to WHENCE:

	   WHENCE=0 (SEEK_SET)
		   POS is absolute position. (Seek relative to the start of the file)

	   WHENCE=1 (SEEK_CUR)
		   POS is an offset from the current position. (Seek relative to current)

	   WHENCE=2 (SEEK_END)
		   POS is an offset from the end of the file. (Seek relative to end)

	   The SEEK_* constants can be imported from the "Fcntl" module if you don't wish to use the numbers 0 1 or 2 in your code.

	   Returns 1 upon success, 0 otherwise.

       $io->sysseek( POS, WHENCE )
	   Similar to $io->seek, but sets the IO::File's position using the system call lseek(2) directly, so will confuse most perl IO operators
	   except sysread and syswrite (see perlfunc for full details)

	   Returns the new position, or "undef" on failure.  A position of zero is returned as the string "0 but true"

       $io->tell
	   Returns the IO::File's current position, or -1 on error.

SEE ALSO

       perlfunc, "I/O Operators" in perlop, IO::Handle IO::File

HISTORY

       Derived from FileHandle.pm by Graham Barr <gbarr@pobox.com>

perl v5.12.1							    2010-04-26							 IO::Seekable(3pm)