03-30-2011
cat: write error: Connection reset by peer
I have created a script to cat the contents of a log file and pipe it to head and tail so I can get specific lines.
When I do this I sometimes randomly get the error
"cat: write error: Connection reset by peer". It is completely sporatic and sometimes it doesnt happen and sometimes it does but it means therefore the output of the script is unreliable.
Here is the code I am using where tmpfile is the name of the file im cat'ing and errorstartline is the line number in the file I want to load into the "line" variable.
line=`cat $TMPFILE | head -$ERRORSTARTLINE | tail -1`
I initially thought this was because the TMPFILE was on another mount so I added some code to cp the file to the same dir as the script and then cat but it made no difference.
Has anyone seen this error or can anyone recommend an alternative way of getting a specified line out of the log file. The log file isnt that large I dont think so not sure why I am seeing this issue.
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TMPFILE(3) 1 TMPFILE(3)
tmpfile - Creates a temporary file
SYNOPSIS
resource tmpfile (void )
DESCRIPTION
Creates a temporary file with a unique name in read-write (w+) mode and returns a file handle .
The file is automatically removed when closed (for example, by calling fclose(3), or when there are no remaining references to the file
handle returned by tmpfile(3)), or when the script ends.
For details, consult your system documentation on the tmpfile(3) function, as well as the stdio.h header file.
RETURN VALUES
Returns a file handle, similar to the one returned by fopen(3), for the new file or FALSE on failure.
EXAMPLES
Example #1
tmpfile(3) example
<?php
$temp = tmpfile();
fwrite($temp, "writing to tempfile");
fseek($temp, 0);
echo fread($temp, 1024);
fclose($temp); // this removes the file
?>
The above example will output:
writing to tempfile
SEE ALSO
tempnam(3), sys_get_temp_dir(3).
PHP Documentation Group TMPFILE(3)