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Top Forums UNIX for Dummies Questions & Answers About UNIX Post 21671 by LivinFree on Tuesday 21st of May 2002 06:32:59 AM
Old 05-21-2002
Unix helps those that help themselves.
It's sort of unforgiving that way...

In short, it is an Operating System, is very powerful, can be run on just about any mainstream hardware (even a few that aren't), and has had a strong networking core before most other operating systems.

All you need is a client to connect.
From windows, go to start, run, and type "telnet sdf.lonestar.org".
You're now connected to a public access Unix system in Texas.

You will be connected to a command-line session, but graphical environments are available (Xwindows, with a few different window managers, and hundreds of different themes, depending on which Unix you choose).

Seriously though, the more you learn about Unix, the more you'll likely have more questions (initially). The search function truly is your friend.
 
Test Your Knowledge in Computers #478
Difficulty: Medium
The first commercially available TB hard drive was released in 2005.
True or False?

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PTY(7)							     Linux Programmer's Manual							    PTY(7)

NAME
pty - pseudo-terminal interfaces DESCRIPTION
A pseudo-terminal is a pair of virtual character devices that provide a bidirectional communication channel. One end of the channel is called the master; the other end is called the slave. The slave end of the pseudo-terminal provides an interface that behaves exactly like a classical terminal. A process that expects to be connected to a terminal, can open the slave end of a pseudo-terminal and then be driven by a program that has opened the master end. Anything that is written on the master end is provided to the process on the slave end as though it was input typed on a terminal. For example, writing the interrupt character (usually control-C) to the master device would cause an interrupt signal (SIGINT) to be generated for the foreground process group that is connected to the slave. Conversely, anything that is written to the slave end of the pseudo-terminal can be read by the process that is connected to the master end. Pseudo-terminals are used by applications such as network login services (ssh(1), rlogin(1), telnet(1)), terminal emulators, script(1), screen(1), and expect(1). Historically, two pseudo-terminal APIs have evolved: BSD and System V. SUSv1 standardized a pseudo-terminal API based on the System V API, and this API should be employed in all new programs that use pseudo-terminals. Linux provides both BSD-style and (standardized) System V-style pseudo-terminals. System V-style terminals are commonly called Unix 98 pseudo-terminals on Linux systems. Since kernel 2.6.4, BSD-style pseudo-terminals are considered deprecated (they can be disabled when configuring the kernel); Unix 98 pseudo-terminals should be used in new applications. Unix 98 pseudo-terminals An unused Unix 98 pseudo-terminal master is opened by calling posix_openpt(3). (This function opens the master clone device, /dev/ptmx; see pts(4).) After performing any program-specific initializations, changing the ownership and permissions of the slave device using grantpt(3), and unlocking the slave using unlockpt(3)), the corresponding slave device can be opened by passing the name returned by ptsname(3) in a call to open(2). The Linux kernel imposes a limit on the number of available Unix 98 pseudo-terminals. In kernels up to and including 2.6.3, this limit is configured at kernel compilation time (CONFIG_UNIX98_PTYS), and the permitted number of pseudo-terminals can be up to 2048, with a default setting of 256. Since kernel 2.6.4, the limit is dynamically adjustable via /proc/sys/kernel/pty/max, and a corresponding file, /proc/sys/kernel/pty/nr, indicates how many pseudo-terminals are currently in use. For further details on these two files, see proc(5). BSD pseudo-terminals BSD-style pseudo-terminals are provided as precreated pairs, with names of the form /dev/ptyXY (master) and /dev/ttyXY (slave), where X is a letter from the 16-character set [p-za-e], and Y is a letter from the 16-character set [0-9a-f]. (The precise range of letters in these two sets varies across Unix implementations.) For example, /dev/ptyp1 and /dev/ttyp1 constitute a BSD pseudo-terminal pair. A process finds an unused pseudo-terminal pair by trying to open(2) each pseudo-terminal master until an open succeeds. The corresponding pseudo- terminal slave (substitute "tty" for "pty" in the name of the master) can then be opened. FILES
/dev/ptmx (Unix 98 master clone device) /dev/pts/* (Unix 98 slave devices) /dev/pty[p-za-e][0-9a-f] (BSD master devices) /dev/tty[p-za-e][0-9a-f] (BSD slave devices) NOTES
A description of the TIOCPKT ioctl(2), which controls packet mode operation, can be found in tty_ioctl(4). The BSD ioctl(2) operations TIOCSTOP, TIOCSTART, TIOCUCNTL, and TIOCREMOTE have not been implemented under Linux. SEE ALSO
select(2), setsid(2), forkpty(3), openpty(3), termios(3), pts(4), tty(4), tty_ioctl(4) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2005-10-10 PTY(7)

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