I've referred to PCL command reference document to understand the characters in the file. But it appears too tedious to follow the entire PCL file.

I don't think there really are any other options.  As PCL consists of escape sequences (of varying length) intermixed with graphics (pixel) data and maybe plain text, you won't have much luck finding a "record" separator.  In other words, to really know what is what in the file, you'd have to parse or "understand" each escape sequence...

What exactly do you need to edit?  (and why, me wonders...)

In reply to Re^3: How to edit a PCL file by almut
in thread How to edit a PCL file by GoForIt

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