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Top Forums UNIX for Dummies Questions & Answers Search for a string and replace the searched string in the same position in samefile Post 302285619 by zaxxon on Monday 9th of February 2009 10:31:48 AM
Old 02-09-2009
Code:
awk '{sub(/^../,"20",$6); print}' infile > tmpfile
mv tmpfile infile

Replaces the 1st two didigts always in field 6 against "20". Write the changed output to tmpfile and then moves tmpfile to infile, overwriting it. Maybe this is an option for you.
 

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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)
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