Print multiple variables with one command in GDB

Question

I want to execute the very simple command

print var1, var2, var3, var4 

in gdb to examine the values of the vars from time to time.

Answer 1

Use the printf command. It's a bit of a hassle, but it gives good control over the formatting. From the command line:

(gdb) help printf
printf "printf format string", arg1, arg2, arg3, ..., argn
This is useful for formatted output in user-defined commands.

The format string is like in C (%d for normal size ints, %s for null terminated strings, etc.).

Answer 2

There may be a simpler solution, but you might be able to put together something using GDB macros: http://www.ibm.com/developerworks/aix/library/au-gdb.html

Answer 3

Use Macros:

For example to continue to next break point and print

(gdb) define prm 

Type commands for definition of prm. End with a line saying just end.

>continue
>print var1
>print var2
>print var3
>end

(gdb) prm
$5 = 0
$6 = 10
$7 = -1

Answer 4

You can simply do this

print {var1,var2,var3,var4}

This will do the job.