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You can   under Linux or Unix like operating systems. The cat command also number all output lines starting with number one with the following syntax:

cat -n fileNameHere

OR

cat --number foo.c

The -b / --number-nonblank option number all nonempty output lines, starting with one and the syntax is:

cat -b fileNameHere

OR

cat --number--nonblank filename

Finally, you suppress or remove repeated empty output lines with the -s / --squeeze-blank option:
cat -s -n fileNameHere

OR

cat --squeeze-blank -n filename

Say hello to nl command

Use  under Linux or Unix oses. The syntax is:

nl filename

Examples

Create a text file called hello.c as follows:

/* Purpose: Sample see program to print Hello world on stdout  * Author: nixCraft * Copyright: None / Copyleft */ #include
        
          /* our main */int main(void){
       	printf("Hello world\n");	return 0;}
        

Use the cat or nl command to display line numbers:

cat -n hello.cnl hello.c

Sample outputs:

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