Hi,
I don't think there is a command to go a step backward during  G-code 
program execution. Maybe you could try to write a O-word subroutine using 
loop and conditions statements to let your program go back and repeat a 
group of lines when needed.
More on O-word here:

http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Oword

Regards,

Manfredi

>From: "Karen hov." <[EMAIL PROTECTED]>
>Reply-To: "Enhanced Machine Controller (EMC)" 
><[email protected]>
>To: [email protected]
>Subject: [Emc-users] back line
>Date: Sun, 28 Jan 2007 12:30:24 -0800 (PST)
>
>Dear Sirs,
>
>I use TKEMC software & I have a question. Would
>you please be so kind & help me to solve the problem .
>
>I want to add a "bottom" that do "Backward Step".
>
>write part of a very simple program
>n10    g0 x0 y0 z0
>n20    g1 f10 z-0.10
>n30    x1
>n40    y1
>n50    x0
>n60    y0
>n70    g0 z0
>n80    m2
>If run the program using step and have just completed
>line n50.
>i want it go back and run n40,then n30,..
>
>Thanks in advance & looking forward to receive
>your reply ASAP.
>
>Best Regards,
>Karen Hovsepian
>HI Automation
>
>
>
>
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