How to modify variable values in gdb on Linux?

To change the value of a variable in Linux using GDB, you can follow these steps:

1. To start the GDB debugger, the command format is: gdb executable file. For example, to debug an executable file named “example,” you can execute the command gdb example.
2. To set a breakpoint in GDB, you can use the break command. For example, if you want to set a breakpoint at line 10 of the function foo, you can execute the command break foo:10.
3. To run the program, you can use the run command. For example, enter the command run.
4. When the program stops at a breakpoint, you can use the print command to view the current value of variables. For example, to check the value of variable x, you can execute the command print x.
5. To change the value of a variable, use the set command. For example, to change the value of variable x to 10, you can execute the command set x = 10.
6. To continue executing the program, you can use the continue command. For example, to resume running the program, you can use the continue command.
7. You can check the new value of the variable by using the print command again. For example, execute the command print x.
8. If further debugging or modifying of other variables is needed, repeat steps 4 to 7.
9. After finishing debugging, you can exit the GDB debugger using the command quit. For example, type quit to exit.

Caution: Modifying variable values in GDB requires a certain understanding of the debugging process, proceed with caution to avoid program crashes or other errors.