Get Data

There are many characters that print nothing still take space in your document. You use many of these characters every day, but probably dont think of them as characters (as such). The list of non-printing characters that Word uses includes the following:

• Column breaks
• Hidden text
• Newline characters
• Optional hyphens
• Page breaks
• Paragraph marks
• Section breaks
• Spaces
• Tabs

Here I will show you how does these non-printing characters creep into your document, how to view them and how to remove them.

For example: you copy this peace of code below, a simple kernel module and try to compile it with the Makefile and if you really want to prove your self try even to remove those compilation errors...!

Code for test.c:

#include <linux/module.h>  /* Needed by all modules */
#include <linux/kernel.h>/* Needed for KERN_INFO */
#include <linux/init.h> 
#include <linux/version.h>

MODULE_LICENSE(“GPL”)
MODULE_DESCRIPTION(“This is a basic test moudle)
MODULE_AUTHOR(“Vamshi Krishna Gajjela)

int init_module(void)
{
printk(KERN_INFO "My first test module loaded.
");
return 0;
}
void cleanup_module(void)
{
printk(KERN_INFO “Test module unloaded
");
}

Makefile:

obj-m += test.o

all:
      make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
      make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

after compilation you will end up with stray errors like this, shown in the below image, and these stray errors are because of non printing characters.