cat <interface> <dev[:part]> <file>
The cat command prints the file content to standard out.
- interface
- interface for accessing the block device (mmc, sata, scsi, usb, ....)
- dev
- device number
- part
- partition number, defaults to 1
- file
- path to file
Here is the output for a example text file:
=> cat mmc 0:1 hello hello world =>
The cat command is only available if CONFIG_CMD_CAT=y.
The return value $? is set to 0 (true) if the file is readable, otherwise it returns a non-zero error code.