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Top Forums UNIX for Dummies Questions & Answers [Solved] Check for a file and keep waiting for 30 mins Post 302715715 by jim mcnamara on Monday 15th of October 2012 09:50:24 AM
Old 10-15-2012
doing exactly as described:
Code:
#!/bin/ksh
if [ ! -f /data/source/a.txt ] ; then
   sleep 1800  # wait 30 minutes
fi
[ -f /data/source/a.txt ]  && echo 'a.txt found' || echo 'a.txt not found'
exit 0

The best choice is to use special commands, if you have them. For example linux has the inotify api. The command inotifywait does exactly what you want and also does what the other have shown as example code. What OS do you have?
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STREAM_COPY_TO_STREAM(3)						 1						  STREAM_COPY_TO_STREAM(3)

stream_copy_to_stream - Copies data from one stream to another

SYNOPSIS
int stream_copy_to_stream (resource $source, resource $dest, [int $maxlength = -1], [int $offset]) DESCRIPTION
Makes a copy of up to $maxlength bytes of data from the current position (or from the $offset position, if specified) in $source to $dest. If $maxlength is not specified, all remaining content in $source will be copied. PARAMETERS
o $source - The source stream o $dest - The destination stream o $maxlength - Maximum bytes to copy o $offset - The offset where to start to copy data RETURN VALUES
Returns the total count of bytes copied. CHANGELOG
+--------+------------------------------+ |Version | | | | | | | Description | | | | +--------+------------------------------+ | 5.1.0 | | | | | | | Added the $offset parameter | | | | +--------+------------------------------+ EXAMPLES
Example #1 A stream_copy_to_stream(3) example <?php $src = fopen('http://www.example.com', 'r'); $dest1 = fopen('first1k.txt', 'w'); $dest2 = fopen('remainder.txt', 'w'); echo stream_copy_to_stream($src, $dest1, 1024) . " bytes copied to first1k.txt "; echo stream_copy_to_stream($src, $dest2) . " bytes copied to remainder.txt "; ?> SEE ALSO
copy(3). PHP Documentation Group STREAM_COPY_TO_STREAM(3)
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