cfgetispeed - Linux
Overview
cfgetispeed
is a versatile command that extracts the input baud rate (speed) from a specified serial port. It is commonly used for configuring serial port connections and monitoring communication parameters.
Syntax
cfgetispeed <serial_port>
Arguments
- serial_port: The path to the serial port device, e.g.,
/dev/ttyS0
or/dev/ttyUSB0
.
Options/Flags
- –help (-h): Displays a brief help message and usage information.
- –version (-V): Shows the command’s version information.
Examples
Simple Usage
Get the input baud rate of the /dev/ttyS0
serial port:
cfgetispeed /dev/ttyS0
Complex Usage
Use a variable to store the baud rate and print it:
BAUD_RATE=$(cfgetispeed /dev/ttyS0)
echo "Baud rate: $BAUD_RATE"
Common Issues
- No output: Check if the serial port path is correct and if the port is open.
- Non-baud rate output: Ensure the port is configured in a raw mode or in a mode that supports baud rate.
Integration
Combine cfgetispeed
with other commands for advanced tasks:
- Setting baud rate: Set the output baud rate using
cfgetospeed
:
stty -F /dev/ttyS0 $(cfgetispeed /dev/ttyS0)
Related Commands
stty
: Configure serial port settingsminicom
: Serial port communication toolscreen
: Terminal multiplexer for serial ports