how to trace C in linux

Now I write a c program in linux using vi and gcc. But if there is something wrong in my program, i don't know how to trace.

For Turbo C in windows, i just need to press F7 and add variables to watch by using Ctrl+F7. For Linux, anyone could tell me?

used gdb, its the debugger

Quote:

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Originally Posted by Thantos

used gdb, its the debugger

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Well, I am writing "more1" program now.

I use gdb more1
and then I type run
just run.
I want to trace and I found from googling, I should type step. So I type step. but gdb say your more1 is not running. So I try to type run abc.txt. And then it halt. How to trace line by line?

you need to set a breakpoint. type: "help b" without the "" to get the exact syntax. You can use list to show the 10 lines around the currentline along with the line number.

So basic steps is:
list to get the line number
set the break point on the line you want
run to start the program
and then use step and next to move through the program

Try

Code:

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gdb more1
....... you are now in the gdb program "gdb>" is the prompt.
gdb> br main
gdb> r
...............
gdb> step

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you can use "print varname" to look at a variable named varname, "step" to execute the next line of code. To stop debugging type "quit"