Hello friends,
==============
[EMAIL PROTECTED] wrote:
> The single quotes are suffient to protect the '$' from the shell. The '\'
> is harmless but unnecessary as '$' is not special to chat. In this case
> chat just eats the '\', determines the the '$' is not one of its special
> characters, sends the '$', and proceeds. I do not recommend relying on
> this behavior however, since it is undocumented. Chat could just as well
> eat non-special characters preceeded by a '\'.
Ehm... This is true. I tried the chat on the command line and it works
just fine. However, if someone tries to run chat within pppd (parameter
"connect") without '\', it goes awry. Here, have a look at this:
I type this command:
knm:~# pppd /dev/ttyS0 connect "chat -v '' 'at$n=1' OK"
And this is what I found in /var/log/ppp.log:
Feb 15 19:12:07 knm pppd[494]: pppd 2.2.0 started by root, uid 0
Feb 15 19:12:08 knm chat[495]: send (at=1^M)
Feb 15 19:12:08 knm chat[495]: expect (OK)
Feb 15 19:12:08 knm chat[495]: at=1^M^M ##### <--- see that ?!
Feb 15 19:12:08 knm chat[495]: OK -- got it
However, if I try this command:
knm:~# pppd /dev/ttyS0 connect "chat -v '' 'at\$n=1' OK"
it is correct then:
Feb 15 19:13:40 knm pppd[502]: pppd 2.2.0 started by root, uid 0
Feb 15 19:13:41 knm chat[503]: send (at$n=1^M)
Feb 15 19:13:41 knm chat[503]: expect (OK)
Feb 15 19:13:41 knm chat[503]: at$n=1^M^M
Feb 15 19:13:41 knm chat[503]: ERROR^M
My modem doesn't know the $n directive so it returns ERROR, that's fine.
As I do not use pon and poff scripts (maybe I should, what do you
think?), rather call pppd directly, I have to use multiple-backslash
convention ;-) Number of backslashes used is mostly empirically guessed
:)
Thanks for making my knowledges wider ;-)
Everything the best,
Peter
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