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Full Discussion: where to download unix os
Operating Systems Linux Fedora where to download unix os Post 302430049 by Corona688 on Wednesday 16th of June 2010 12:02:18 PM
Old 06-16-2010
Quote:
Originally Posted by aarsh
thanks to all.
so can we say that "the terminal program in Linux (unix ) is the same what command prompt program (dos) means to windows?
Terminals and GUI's are both just programs -- linux makes no special distinction between them, a GUI program is just an ordinary program that happens to be talking with an X server... Everything you see and interact with is just programs running inside the OS, the OS is kind of intangible to the user.

What Linux fundamentally is, is a kernel. That is -- a small program, about a meg or so in size that the system boots raw from disk. It handles all devices and loads programs, runs programs, switches between programs, lets programs talk to each other, and deals with files when programs tell it to. That is it, there's no shell or GUI built in. Everything like that in a Linux distro are programs that just run inside Linux.

IOW it's a completely barebones "utility" to run programs inside. It runs one and only one program automatically, on boot: init. Think of it like autoexec.bat, except it's optional for DOS to have an autoexec.bat but mandatory for Linux to have an init; without an autoexec.bat, DOS just drops to a command prompt, but init would actually be the command prompt(or at least be responsible for creating one), and if there's nothing there then what? It's also very different from DOS in that it's multitasking, of course.

So, UNIX describes a broad design for two things:
  1. The kernel(aka operating system)
  2. The standard set of programs that come with the kernel

This is very different from Windows where it's all treated like one inseperable block.

Last edited by Corona688; 06-16-2010 at 01:19 PM..
 

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PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME
pidof -- find the process ID of a running program. SYNOPSIS
pidof [-s] [-x] [-o omitpid] [-o omitpid..] program [program..] DESCRIPTION
Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead. OPTIONS
-s Single shot - this instructs the program to only return one pid. -x Scripts too - this causes the program to also return process id's of shells running the named scripts. -o Tells pidof to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro- gram, in other words the calling shell or shell script. NOTES
pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin. When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen to have the same name as the program you're after but are actually other programs. SEE ALSO
shutdown(8), init(8), halt(8), reboot(8) AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl 01 Sep 1998 PIDOF(8)
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