The error is very clear. ``2_ave'' is not a valid variable name. Use
a valid name. This is not a bug, it is documented. Check the
DEFINITIONS section of your bash manual, it says:
name A word consisting only of alphanumeric characters and underscores,
and
beginning with an alpha
Message-Id:
Date: Fri, 11 Oct 2013 17:43:42 +0200
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCON
