How can I send Ctrl-D over Telnet session

bulent_sahin has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks, I am trying to write a very simple client application on Win.XP... it will use Net::Telnet to connect a GSM node and it will send a command to the GSM node again via telnet session...

Sometimes, after the command send, GSM node needs Ctrl-D to produce command output.

I have send command and capture output successfuly but I can not send Ctrl-D which is some commands require Ctrl-D.

How can I send Ctrl-D over Telnet session in Telnet cmd("") command ?

Could you please help me to solve this issue...it is very critical for my development... I am realy appricate all your help beforehand... with my Best Regards, bulent_sahin.

Comment on How can I send Ctrl-D over Telnet session

Replies are listed 'Best First'.
Re: How can I send Ctrl-D over Telnet session by RMGir (Prior) on Sep 10, 2008 at 08:59 UTC
ctrl-d is just the byte 0x04 (just like space, character 32, is the byte 0x20), so in perl, ^D is "\x4". So just put a "\x4" in your string where you want the ctrl-D, or even better: `# also declare other ctrl chars you need... my $ctrlD = "\x4"; my $escape = "\x1b"; #... more code here... cmd("Send all the\ncommands you need\nincluding a ${ctrlD}");` [download] Mike	[reply] [d/l]
Re^2: How can I send Ctrl-D over Telnet session by tye (Sage) on Sep 10, 2008 at 14:19 UTC
Since asked for CTRL-D, I'd use "\cD" instead. - tye	[reply]
Re^3: How can I send Ctrl-D over Telnet session by RMGir (Prior) on Sep 10, 2008 at 15:39 UTC
That works... I didn't know that escape, thanks! Mike	[reply]
Re^2: How can I send Ctrl-D over Telnet session by Anonymous Monk on Sep 10, 2008 at 09:53 UTC
`C:\>perl -e"print qq,\cD," ♦ C:\>perl -e"print qq,\cD," \|hexdump 00000000: 04 - \| \| 00000001; C:\>perl -e"print qq,\cD," \|od -tacx1 0000000 eot 004 04 0000001 C:\>` [download]	[reply] [d/l]
Re: How can I send Ctrl-D over Telnet session by DrHyde (Prior) on Sep 10, 2008 at 10:41 UTC
Send the ASCII EOT character, see this table for any others you might need.	[reply]
Re^2: How can I send Ctrl-D over Telnet session by TGI (Parson) on Sep 10, 2008 at 17:31 UTC
That's a great link! The author of that page has more info on character and encoding issues, and a bunch of other interesting stuff as well. I like this ASCII chart becuase it is compact and easy to print double sided on a piece of paper. TGI says moo	[reply]