Miscellaneous Code

Creating files with Test Code

Sometimes we need to create files with text to help us develop or test our code.

Bash or CMD

One ways to create a file in the command line is to use echo

echo "some text" > filename.txt

system() function

Caution

This method is not intended for production code

1. You can wrap the command in function system() to run a command from your code.

   system("echo \"some text\" > filename.txt");
   

2. You can also use sprintf to build you command string using variables. sprintf works similarly to printf except it sends the data to the a variable instead to the screen.

   char *filename = "filename.txt";
   char command[128];                   // container for the command
   
   // Build a string and store in variable 'command'
   sprintf(command, "echo \"%s\" > %s", "some random text", filename);
   
   // Execute the command
   system(command);
   

Source & license

Reproduced verbatim, without modification from © 2022, BilimEdtech Labs, licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).

Source page: https://labs.bilimedtech.com/operating-systems/references/misc.html

See LICENSE for the full license text.