Also keep in mind if the file needs to retain special characters (like tabs, form feeds...) or trailing spaces. Some compilers/runtimes (like Micro Focus) like to strip trailing spaces or automatically precede special characters with their own special characters.
A current project brought this up. I'm bumping two identical ISAM files against each other. For every record in file1 I look to see if there's a matching record in file2. If there is and the values of select fields are different I update those fields and rewrite the record in file2. Pretty...
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