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Top Forums Shell Programming and Scripting While loop till length of line is great enough Post 302897461 by claire.a on Monday 14th of April 2014 09:09:20 AM
Old 04-14-2014
While loop till length of line is great enough

I have the following code:

Code:
# Get the line of stations_info.txt starting with "${xstation1} " and copy it to file temp.txt
					grep "^${xstation1} " stations_info.txt > temp.txt
					# Get lat and long of station
                                        nl=0
                                        LEN=0
 					while [ ${LEN} -lt 10 ]; do
					line=
					let nl=nl+1
					line=$(head -n ${nl} temp.txt)
					LEN=$(echo ${#line})				
					done
					echo $line > temp2.txt
					lat=`awk '{print $3}' temp2.txt`
					long=`awk '{print $4}' temp2.txt`
					echo ${lat} ${long} >> ${PROJECT}/sources.txt
					rm temp.txt temp2.txt

The idea is to take the line of stations_info.txt which has the station name in the line. I then want to find the line with a length greater than 10. Using this line I need to extract the values from the third and fourth columns. My problem is that the line just extends and isn't reset. How can I get the line to reset, or do the above in another way?

Thanks in advance

---------- Post updated at 01:09 PM ---------- Previous update was at 01:03 PM ----------

I was being silly - have to change head
 

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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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