How do I pass a command line argument while starting up GDB in Linux?

Another option, once inside the GDB shell, before running the program, you can do

(gdb) set args file1 file2

and inspect it with:

(gdb) show args

I'm using GDB7.1.1, as --help shows:

gdb [options] --args executable-file [inferior-arguments ...]

IMHO, the order is a bit unintuitive at first.

Try

gdb --args InsertionSortWithErrors arg1toinsort arg2toinsort

Once gdb starts, you can run the program using "r args".

So if you are running your code by:

$ executablefile arg1 arg2 arg3

Debug it on gdb by:

$ gdb executablefile  
(gdb) r arg1 arg2 arg3

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