It'd be nice if /fseek could be a bit better explained. Specifically, what the -n switch does, as it doesn't mention this at all:
/fseek <name> <position>
Sets the read/write pointer to the specified position in the file. The following switches may also be used to move the file pointer:
-l <name> <line number>
-w <name> <wildcard>
-r <name> <regex>
The other switches speak for themselves.