Shulou(Shulou.com)06/03 Report--

1. Internal communication system

2. External communication system

3. Instant messaging

1) chat command write (must be online)

Write username [terminal]

$write npp terminal number (when multiple people log in at the same time)

$write npp

...

Ctrl+d (end)

End of message sending with o (end)

End the conversation with oo (end and exit)

Write command: half-duplex communication

2) message switch command mesg

$mesg n: refuse to receive messages

$mesg y: can receive messages

$mesg

3) two-way communication command talk (full-duplex mode)

Both parties send talk to each other before they can communicate.

The screen is divided into two halves: the top half: the bottom half of the self-input box: the opposite input box

4) broadcast information command wall (write all)

Normal permission issued: only users with mesg open will receive

# wall super users can be forcibly sent to everyone

4. Email (non-timely communication)

1) mail receives mail

Enter mail to enter internal command mode

P: display this email message

S file: save the current message to the file file

M usr: send a new email to user usr

D: delete the current message

N: show the next message

Q: exit

R: reply to email

! Execute the shell command

? : display the internal commands of mail

2) mail username sends email

$mail npp

Subject:test mail

...

Ctrl+d

Cc: CC

Send in a group:

(1) $mail npp1 npp2 npp3

(2) $mail NPP (user group)

(3) Alias

$alias usr_list npp1 npp2 npp3

$mail usr_list

Send attachment:

$mail npp < note.doc sends the file from the direction

Send to users who do not exist:

Return to the dead.letter under the home directory of this user

3) system mailbox: / usr/mail or / var/mail. Such as: / var/mail/npp

4) personal mailbox: mbox file under the user's home directory. / home/npp/mbox

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