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   chat    ( 8 )

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ECHO

The echo options controls whether the output from the modem is
       echoed to stderr. This option may be set with the -e option, but
       it can also be controlled by the ECHO keyword. The "expect-send"
       pair ECHO ON enables echoing, and ECHO OFF disables it. With this
       keyword you can select which parts of the conversation should be
       visible. For instance, with the following script:

              ABORT   'BUSY'
              ABORT   'NO CARRIER'
              ''      ATZ
              OK\r\n  ATD1234567
              \r\n    \c
              ECHO    ON
              CONNECT \c
              ogin:   account

       all output resulting from modem configuration and dialing is not
       visible, but starting with the CONNECT (or BUSY) message,
       everything will be echoed.