Difference between revisions of "Talkd and the talk command"

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The "talk" command allows you to talk to other users on the same system, which is useful if you're both SSH'd in from somewhere. Using it is very simple; to talk to someone the command is just
 
The "talk" command allows you to talk to other users on the same system, which is useful if you're both SSH'd in from somewhere. Using it is very simple; to talk to someone the command is just
  
{{bc|talk <username> <tty>}}
+
{{bc|$ talk <username> <tty>}}
  
 
Of course, you can talk to users on another system as well:
 
Of course, you can talk to users on another system as well:
  
{{bc|talk <username>@<hostname> <tty>}}
+
{{bc|$ talk <username>@<hostname> <tty>}}
  
 
In either case, the tty is optional. It is used if you wish to talk to a local user who is logged in more than once to indicate the appropriate terminal name. "tty" is of the form 'ttyXX', or 'pts/X'.
 
In either case, the tty is optional. It is used if you wish to talk to a local user who is logged in more than once to indicate the appropriate terminal name. "tty" is of the form 'ttyXX', or 'pts/X'.
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# First, install the inetutils package, which contains talk and talkd. These also rely on xinetd, so install that as well. You might also need the screen command; it's in the screen package. {{bc|1=
 
# First, install the inetutils package, which contains talk and talkd. These also rely on xinetd, so install that as well. You might also need the screen command; it's in the screen package. {{bc|1=
pacman -S inetutils xinetd screen
+
# pacman -S inetutils xinetd screen
 
}}
 
}}
 
# Configure the xinetd service entry by editing {{ic|/etc/xinetd.d/talk}} and setting "disable = no".
 
# Configure the xinetd service entry by editing {{ic|/etc/xinetd.d/talk}} and setting "disable = no".
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}}
 
}}
 
# Now start xinetd: {{bc|1=
 
# Now start xinetd: {{bc|1=
systemctl start xinetd.service
+
# systemctl start xinetd.service
 
}}
 
}}
 
# If you're on the local system, you might need to start a screen session to make yourself show up on the "w" and "who" commands -- you need to show up there or talk won't work.
 
# If you're on the local system, you might need to start a screen session to make yourself show up on the "w" and "who" commands -- you need to show up there or talk won't work.
 
# Allow write access in your terminal if needed: {{bc|1=
 
# Allow write access in your terminal if needed: {{bc|1=
mesg y
+
$ mesg y
 
}}
 
}}
  
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[Install]
 
[Install]
Also=talk.socket
+
Also=talkd.socket
 
}}
 
}}
  
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Then activate the talkd daemon:
 
Then activate the talkd daemon:
  
{{bc|$ sudo systemctl start talkd}}
+
{{bc|# systemctl start talkd}}
  
 
Now, the Lennart is strong in you!
 
Now, the Lennart is strong in you!

Revision as of 17:17, 4 November 2013

The "talk" command allows you to talk to other users on the same system, which is useful if you're both SSH'd in from somewhere. Using it is very simple; to talk to someone the command is just

$ talk <username> <tty>

Of course, you can talk to users on another system as well:

$ talk <username>@<hostname> <tty>

In either case, the tty is optional. It is used if you wish to talk to a local user who is logged in more than once to indicate the appropriate terminal name. "tty" is of the form 'ttyXX', or 'pts/X'.

Setup

Using xinetd

  1. First, install the inetutils package, which contains talk and talkd. These also rely on xinetd, so install that as well. You might also need the screen command; it's in the screen package.
    # pacman -S inetutils xinetd screen
  2. Configure the xinetd service entry by editing /etc/xinetd.d/talk and setting "disable = no".
  3. If you are using tcp_wrappers or something similar, add an entry to /etc/hosts.allow:
    talkd: 127.0.0.1
  4. Now start xinetd:
    # systemctl start xinetd.service
  5. If you're on the local system, you might need to start a screen session to make yourself show up on the "w" and "who" commands -- you need to show up there or talk won't work.
  6. Allow write access in your terminal if needed:
    $ mesg y

Talk should work now.

Using systemd directly

First, create the following two files in /etc/systemd/system:

/etc/systemd/system/talkd.service
# Adapted from original by Zbigniew Jedrzejewski-Szmek; see RedHat Bug 737219

[Unit]
Description=Talk Server
Documentation=man:talk(1) info:talk
Requires=talkd.socket

[Service]
User=nobody
Group=tty
ExecStart=/usr/sbin/talkd
StandardInput=socket

[Install]
Also=talkd.socket
/etc/systemd/system/talkd.socket
# Adapted from original by Zbigniew Jedrzejewski-Szmek; see RedHat Bug 737219

[Unit]
Description=Talk Server Activation Socket
Documentation=man:talk(1) info:talk

[Socket]
ListenDatagram=0.0.0.0:518

[Install]
WantedBy=sockets.target

Then activate the talkd daemon:

# systemctl start talkd

Now, the Lennart is strong in you!