BASH/C2/Case-statement/Gujarati

Time	Narration
00:01	નમસ્તે મિત્રો,Case statement . પરનાં આ સ્પોકન ટ્યુટોરીયલમાં સ્વાગત છે.
00:07	આ ટ્યુટોરીયલમાં આપણે શીખીશું , ઉદાહરણ સાથે case statement' નું મહત્વ case statement નું સિન્ટેક્સ.
00:17	આ ટ્યુટોરીયલના અનુસરણ માટે, તમને Shell Scripting' ના સામાન્ય જ્ઞાન વિષે જાણકારી હોવી જોઈએ.
00:23	જો નથી,તો સંબંધિત ટ્યુટોરિયલ્સ માટે, બતાવેલ અમારી વેબ સાઈટ પર જાઓ.
00:29	આ ટ્યુટોરીયલ માટે હું ઉપયોગ કરી રહી છું Ubuntu Linux 12.04 ઓપરેટિંગ સિસ્ટમ અને GNU BASH આવૃત્તિ 4.1.10
00:39	નોંધ લો પ્રેક્ટીસ માટે GNU Bash આવૃત્તિ 4 અથવા તેથી વધુનો આગ્રહ કરીએ છીએ.
00:47	બેશ શેલમાં બે પ્રકારના કન્ડીશનલ સ્ટેટમેંટ હોય છે. if statement અને case statement.
00:56	if-else statement' ની જગ્યાએ વૈકલ્પિક રીતે Case statement વાપરી શકાય છે.
01:03	The case statement is preferred when there are many items to select from.
01:09	It is usually used to implement menus in a script.
01:14	Let us see the syntax.
01:15	case space $(dollar)VARIABLE space in match_1 close round brackets space commands and semicolon twice
01:27	match_n close round bracket space commands and semicolon twice asterisk close round bracket space command_to_execute_by_default and semicolon twice esac
01:45	The VARIABLE is compared to match_1.
01:48	If it does not match, it moves on to the next case which is match_n.
01:54	It will check if any one of these strings matches VARIABLE.
02:01	If yes, then all the commands until the double semicolon (;;) are executed.
02:07	If neither match VARIABLE, the commands associated with the asterisk are executed.
02:14	It is the default case condition because the asterisk will match all strings.
02:21	esac marks the end of case block.
02:26	Let us understand case statement with an example.
02:32	I have already typed the program.So, I will open the file case.sh
02:38	The program prints a warning message when the disk space reaches a certain limit.
02:45	This is the shebang line.
02:47	The location of bash is different in other Linux flavours like CentOS, RedHat etc.
02:55	Previously used /bin/bash points directly to the binary file.
03:01	env used here, abstracts the true location where bash is located.
03:07	This shebang line improves the portability of the script on any GNU/Linux system.
03:16	df -(hyphen)h displays disk space usage in human readable form.
03:22	The output is piped to sort -rk5, which sorts the fifth column in reverse order.
03:31	The output is then passed to awk 'FNR == 2 {print $5}'
03:38	which extracts the fifth field of the second line.
03:43	Eventually, the output is passed to cut -(hyphen)d “% -(hyphen)f1” to strip out % sign.
03:55	This is the first line of case statement.
03:59	Here, we compare the space between 0 and 69.
04:04	If match is found, it prints "Everything is OK”
04:08	Next, it compares the space between 70 and 89 or from 91 to 98;
04:17	If match is found, it prints “Clean out. There's a partition that is $(dollar)space % full.”
04:27	Here, it compares the space with 99.
04:30	If match is found, it prints “Hurry. There's a partition at $(Dollar) space %!”
04:39	This is the default case condition because the asterisk will match all strings.
04:45	And this is the end of case statement.
04:48	Now go to the terminal, to make the file executable.
04:52	Type chmod space plus x space case dot sh
04:57	Type dot slash case dot sh
05:02	Everything is OK.Note that the output will vary depending on your system diskspace.
05:10	In my machine, as match is found between 0 and 69, it prints Everything is OK.
05:18	Check the message printed on your machine.
05:20	You will be able to understand which case statement was executed.
05:27	This brings us to the end of this tutorial. Let us summarize.
05:31	In this tutorial we learnt, Importance of case statement, Syntax of case statement, With the disc space example
05:41	As an assignment.
05:42	Write a menu driven program for mathematical calculation
05:47	It should take user inputs a and b
05:51	It should ask for mathematical opertator (plus +, minus -, division / and multiplication *). Do the calculation, Print the output
06:02	Watch the video available at the link shown below
06:06	It summarises the Spoken Tutorial project
06:08	If you do not have good bandwidth, you can download and watch it
06:14	The Spoken Tutorial Project Team
06:16	Conducts workshops using spoken tutorials .Gives certificates to those who pass an online test
06:23	For more details, please write to contact@spoken-tutorial.org
06:31	Spoken Tutorial Project is a part of the Talk to a Teacher project
06:35	It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro
06:48	The script has been contributed by FOSSEE and spoken-tutorial team
06:53	This is Ashwini from IIT Bombay.Thank you for joining.

Contributors and Content Editors

Jyotisolanki