10-30-2010
This question is almost too good: "Hm... I could go to unix.com and ask whether a fundamental underpinning of UNIX systems is obsolete and should give forth before the windows brigade... Eh, a bit too obvious. I know -- ask that about an unusual shell, one that divides the community, in a manner that suggests I believe it's all shell scripting! The nerd rage will be hysterical!"
I'll be generous and assume you're not trolling. Is BASH obsolete? No. Is it for the things you use C# or Python for? Also no.
Scripting is somewhere between difficult and useless on a Windows machine because there are so many unscriptables(awkward, undocumented, or impossible). A program as simple as "cdrecord -dao cd_image.iso && /sbin/poweroff" (i.e. burn a cd, then turn off the computer) in UNIX might, in Windows, need an entire development environment, plus peering into undocumented OLE hell to figure out how (if at all!) your favorite CD burning program tells the computer whether burning completed successfully. Ever had to type in the same thing, or closely related things, 37 seperate times? Ever had to repetitively copy/paste data from one program into another because you can't just tell one to read from the other? Ever had to sit and wait for the computer to finish just so you can tell it to do something you wanted it to do all along? That's the kind of automatic tasks shell scripting and pipes are for. They join entire programs together at a very high level, if they're equipped to communicate that way; most UNIX programs are, most Windows ones aren't.
You should learn shell scripting, not just "bash scripting". BASH is just one shell. Learn how to program in a general Bourne shell and you can program in BASH, SH, and KSH the same way, and know what features BASH has and SH doesn't.
Last edited by Corona688; 10-30-2010 at 04:44 PM..
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learn(1) General Commands Manual learn(1)
NAME
learn - Provides computer-aided instruction for the C shell
SYNOPSIS
learn [-directory] [subject] [lesson]
The learn command provides computer-aided instruction courses and practice in the use of Tru64 UNIX.
OPTIONS
Allows you to exercise a script in a nonstandard place.
DESCRIPTION
To get started, enter learn; if this is the first time that you are invoking the learn command, you are guided through a series of ques-
tions to determine what type of instruction you want to receive.
If you have used learn before and left your last session without completing a subject, the program uses information in $HOME/.learnrc to
start you up in the same place you left off.
To bypass questions, enter a subject or lesson. In order to enter a lesson, you must know the lesson number that you received in a previ-
ous learn command session. If you do not know the lesson number, enter the lesson number as a subject. The learn command searches for the
first lesson containing the subject you specified. If the lesson is a - (dash), learn prompts for each lesson; this is useful for debug-
ging.
You can specify the following subjects:
files editor vi morefiles macros eqn C
SUBCOMMANDS
There are a few special commands. The bye command terminates a learn session, and the where command tells you of your progress (where m
tells you more.) The again command redisplays the text of the lesson and again lesson lets you review lesson. The hint command prints the
last part of the lesson script used to evaluate a response, while hint m prints the entire lesson script. This is useful for debugging
lessons and might possibly give you an idea about what is expected.
EXAMPLES
To take the online lesson about files, enter: learn files
You are then prompted for further input.
FILES
Playpen directories. Start-up information.
SEE ALSO
Commands: csh(1), ex(1)
learn(1)