Added in 1.8.10
/fseek [-lnrw] <handle> <position | line number | wildcard | regex>
Sets the read/write pointer to the specified position in the file.
-l - Set position to line 'line number'.
-n - Set position to start of the next line.
-r - Set position to text matching 'regex'.
-w - Set position to text matching 'wildcard'.
<handle> - The file handle to seek.
<position | line number | wildcard | regex> - The position/Line number with -l/Wildcard with -w/Regex with -w to set.