Read is a very versatile command to process input in shell script. In the above case, you can echo the value of $REPLY variable. If you don’t use variable in read statement, then shell script will store user input in REPLY system variable.
Only when they press enter key it will be submitted. In this case, your users will see the prompt, but when they enter input, it will not be visible. In this case, -s stands for silent mode and -p stands for command prompt. For this purpose, use read command with -sp option. For example, if you are reading password, then you will need to hide user input but read it correctly.
Sometimes you may need to hide user input as they are typing. Free RS232 Terminal / Monitor / Debugger Program by SUDT and User Manual 1) Make sure AccessPort is compatible with your operating system. The main difference in this case is that since you are using an array, users can enter any number of input values and shell script will automatically store them in array elements. You may be able to do a lot through the regular Linux Mint console terminal, but again, we need more info. If you search the SPM for 'terminal', you will see a lot of options. You can also send most control characters by holding down the Ctrl key and typing the appropriate letter. So far from what I have been reading, the most popular and liked 'hyper terminal' programs for Linux are: Cutecom, GTKterm, minicom. $ /home/test.shĮnter first name, last name, age:john doe 42 With the settings listed above, anything you type into the Hyperterminal window will be sent out the serial port. In this case, type the user input values in a space separated manner, and press enter when you are ready to submit, just like above. You may also use an array to store multiple inputs #/home/test.shĮcho "enter first_name, last_name and age"Įcho "you entered $ When you have typed all input variable, press enter to pass them to shell script. You need to enter the different user inputs in a space-separated format. #/home/test.shĮcho "enter first_name, last_name and age:"Įcho "you entered $first_name, $last_name, $age Here is an example where we accept multiple variables first_name, last_name and age as user input. You can also read multiple variables by mentioning them one after the other after read command. In the above code, we use read command to read a single input and store it in variable name. Here is an example of shell script #/home/test.sh You can simply mention your variable name after read command to read and store user input in that variable. We will look at different use cases to use read command. You can use read command to accept user input in your shell script. In this article, we will look at the different ways to get user input using read command in shell script. USB Serial port adapter are named as ttyUSB0, ttyUSB1 and so on or ttyACM0, ttyACM1 and so on.
The serial address is stored in the following folder /dev. From now on please connect the Arduino via USB to the Raspberry Pi. Sometimes you may need to get user input in shell script. Because there are different USB ports on the Raspberry Pi we have to find out what serial address the Arduino is connected.