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Additional info for Linux in a nutshell : a desktop quick reference
Manage routing tables. Overview of Networking | 21 Sys Admin Overview Networks connect computers so that the different systems can share information. For users and system administrators, Unix systems have traditionally provided a set of simple but valuable network services that let you check whether systems are running, refer to files residing on remote systems, communicate via electronic mail, and so on. Command routed slattach sshd tcpdump telnetd tftpd zebra Action Dynamically keep routing tables up to date.
S Execute tasks serially. Do not start new task until previous task is completed. -S directory Store timestamps in directory instead of /var/spool/anacron. -t file Read tasks from file instead of from /etc/anacrontab. -T Test validity of configuration file. Can be used with -t. -u Update timestamps for tasks, but don’t run them. -V Print version number, then exit. aplay aplay [options] [file] Play sound files using the ALSA sound system. The related arecord records sound files. Options -c, --channels=n Use n channels: 1 for mono, 2 for stereo.
It has a Cisco IOS-like command syntax that will be familiar to many network administrators. With ip, you can assign an address to a network interface, setting the netmask, broadcast address, and IP address at boot time. You can also set network interface parameters, including the use of ARP, the use of driver-dependent debugging code, the use of one-packet mode, and the address of the correspondent on the other end of a point-to-point link. For more information on ip, see Chapter 3. Overview of TCP/IP | 27 Serial-line communication There are two protocols for serial-line communication: Serial Line IP (SLIP) and Point-to-Point Protocol (PPP).