'K12 text format' is a text packet capture format it's what some Tektronix equipment can write out - in that sense, it's similar to writing out the raw hex data, plus some metadata. So there's no such thing as 'the' text format to save a pcap file as there are a bunch of choices. a C source file showing the raw hex data of the packets, with each packet being in a separate C array of byte values.a JSON file showing the details of each packet.a PDML file showing, as XML, the components of the details of each packet.a PSML file showing, as XML, the components of the packet summaries.a CSV file of particular fields from the packet.

a CSV file of columns from the packet summaries.

a combination of two of those, or of all three of those.a file showing hex dumps of the packet data (showing, for each packet, the default bottommost pane of Wireshark).a file showing the packet details of each packet as text (showing, for each packet, the default middle pane of Wireshark).a file showing the packet summaries as text (the topmost pane of Wireshark, by default).'Text file' covers a number of text file formats, such as: I can save this a.pcap to text file (.txt) with wireshark GUI.

Wireshark command line example