getpmsg - Linux


The getpmsg command is a Linux utility that retrieves and displays Protocol Message Buffers (Protobuf) data from a page cache. It is commonly used for debugging or maintenance purposes, particularly in the context of network communications or message processing systems.


getpmsg [options] <page cache file>


| Option | Description | Default |
| -a, –all | Display all available pages, even those that are not currently allocated. | false |
| -H, –hex | Display the data in hexadecimal format. | false |
| -j, –json | Display the data in JSON format. | false |
| -m, –message | Only display protobuf messages. | false |
| -p, –page | Specify the page number to retrieve. | -1 (all) |
| -r, –raw | Display the data in raw binary format. | false |


Example 1: Display all pages in a page cache file

getpmsg -a <page cache file>

Example 2: Display the first protobuf message in hexadecimal format

getpmsg -m -H -p 0 <page cache file>

Common Issues

  • Cannot find page cache file: Ensure that the specified file exists and has read permissions.
  • Protobuf decoding error: Verify that the protobuf message is valid and uses a supported encoding.
  • Page number out of range: Specify a valid page number within the page cache file.


getpmsg can be combined with other Linux commands for advanced tasks:

  • Use grep to filter the output: getpmsg <page cache file> | grep "field_name"
  • Extract protobuf messages from a dump file: binwalk -e <dump file> | getpmsg

Related Commands

  • protoc – The official Protobuf compiler.
  • grpcurl – A command-line tool for interacting with gRPC services.