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How to learn UNIX
Post 302504434 by michael78 on Monday 14th of March 2011 02:52:16 PM
03-14-2011
Quote:
Install it on its own system, don't try and dual-boot -- if that goes sour you could lose everything. You don't have to put it on a "good" system, even a junk PIII makes a good home-server if it has enough ram(512M or more). Then seriously use it. Do things like try to set up a file server, web server, get ssh going, and so forth. You may need to learn some basics first, like how UNIX manages file ownership and permissions and how partitions work in UNIX; these features at base are nearly the same everywhere, even if some have extended features like access control lists too.
You could also try and find an old HP-UX based system on Ebay. Sometimes you can get old hardware for a song. There's a few kinds of BSD actually, and openBeOS, but close enough. General-purpose commands will be nearly the same. They'll both have commands proscribed by POSIX like cp, mv, echo, and so forth, and they'll all have some variety of Bourne shell available. System configuration will be very different from OS to OS though. Also, different shells have different capabilities, but if you avoid features that aren't strictly Bourne shell features, like arrays, you should be able to write shell scripts that work in most shells. If you need these advanced features, the korn shell is more widely available than bash on most non-Linux systems. At core nearly any UNIX system can be operated almost exclusively from the commandline -- even the heavily-GUI based Macintosh OSX. Most any UNIX can have some sort of GUI available, but this is frequently optional.
You could also try and find an old HP-UX based system on Ebay. Sometimes you can get old hardware for a song. There's a few kinds of BSD actually, and openBeOS, but close enough. General-purpose commands will be nearly the same. They'll both have commands proscribed by POSIX like cp, mv, echo, and so forth, and they'll all have some variety of Bourne shell available. System configuration will be very different from OS to OS though. Also, different shells have different capabilities, but if you avoid features that aren't strictly Bourne shell features, like arrays, you should be able to write shell scripts that work in most shells. If you need these advanced features, the korn shell is more widely available than bash on most non-Linux systems. At core nearly any UNIX system can be operated almost exclusively from the commandline -- even the heavily-GUI based Macintosh OSX. Most any UNIX can have some sort of GUI available, but this is frequently optional.
). I think I will download FreeBSD and OpenSolaris and give them a whirl. Cheers for the help and gad I found this place.|
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LEARN ABOUT SUNOS
rtc
rtc(1M) System Administration Commands rtc(1M) NAME
rtc - provide all real-time clock and GMT-lag management SYNOPSIS
/usr/sbin/rtc [-c] [-z zone-name] DESCRIPTION
On x86 systems, the rtc command reconciles the difference in the way that time is established between UNIX and MS-DOS systems. UNIX systems utilize Greenwich Mean Time (GMT), while MS-DOS systems utilize local time. Without arguments, rtc displays the currently configured time zone string. The currently configured time zone string is based on what was last recorded by rtc-z zone-name. The rtc command is not normally run from a shell prompt; it is generally invoked by the system. Commands such as date(1) and rdate(1M), which are used to set the time on a system, invoke /usr/sbin/rtc -c to ensure that daylight savings time (DST) is corrected for properly. OPTIONS
-c This option checks for DST and makes corrections if necessary. It is normally run once a day by a cron job. If there is no RTC time zone or /etc/rtc_config file, this option will do nothing. -z zone-name This option, which is normally run by the system at software installation time, is used to specify the time zone in which the RTC is to be maintained. It updates the configuration file /etc/rtc_config with the name of the specified zone and the current GMT lag for that zone. If there is an existing rtc_config file, this command will update it. If not, this command will create it. FILES
/etc/rtc_config The data file used to record the time zone and GMT lag. This file is completely managed by /usr/sbin/rtc, and it is read by the kernel. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Architecture |x86 | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
date(1), rdate(1M), attributes(5) SunOS 5.10 3 Oct 2003 rtc(1M)