Re: [Help-bash] bi-directional socket client / server example code?

[Greg Wooledge]

On Mon, Jun 17, 2013 at 04:33:00PM +0000, adrelanos wrote:
> is it possible to do with bi-directional socket client / server
> communication with bash? Is there some example code?

Client only.

exec 3<> /dev/tcp/"$host"/"$port" || exit
IFS= read -r banner <&3
banner=${banner%$'\r'}; echo "Banner: <$banner>"
message='HELO world'
printf '%s\r\n' >&3
IFS= read -r response <&3
response=${response%$'\r'}; echo "Response: <$response>"
... etc. ...
exec 3>&-

If you need server sockets, you'll need to use 3rd party programs, like
tcpserver (from ucspi-tcp), or xinetd/inetd/etc.