BASH/C2/Arithmetic-Comparison/English-timed - Revision history

Pratik kamble at 10:39, 23 March 2017

2017-03-23T10:39:04Z

Pratik kamble at 11:39, 20 February 2017

2017-02-20T11:39:37Z

Pratik kamble at 05:56, 5 January 2017

2017-01-05T05:56:31Z

Sandhya.np14 at 06:19, 13 July 2015

2015-07-13T06:19:36Z

Sandhya.np14 at 10:55, 3 July 2015

2015-07-03T10:55:54Z

Sandhya.np14 at 10:55, 3 July 2015

2015-07-03T10:55:31Z

Show changes

PoojaMoolya at 12:03, 17 December 2014

2014-12-17T12:03:39Z

Ranjana: Created page with "'''Title of script:''' '''Arithmetic comparison in BASH''' '''Author:''' Ashwini Patil '''Keywords: video tutorial, Bash shell, -eq, -ne, -gt, -ge, -lt, -le''' {| border=..."

2014-11-21T07:02:41Z

Created page with "'''Title of script:''' '''Arithmetic comparison in BASH''' '''Author:''' Ashwini Patil '''Keywords: video tutorial, Bash shell, -eq, -ne, -gt, -ge, -lt, -le''' {| border=..."

New page

'''Title of script:''' '''Arithmetic comparison in BASH'''

'''Author:''' Ashwini Patil

'''Keywords: video tutorial, Bash shell, -eq, -ne, -gt, -ge, -lt, -le'''

{| border=1
!Time
!Narration

|-
| 00:01
| Welcome to the spoken tutorial on '''Arithmetic Comparison in BASH'''

|-
| 00:07
| In this tutorial, we will learn

|-
| 00:09
| * '''equal to'''
* '''not equal to'''
* '''less than'''
* '''less than equal to'''
* '''greater than''' and
* '''greater than equal to''' commands

|-
| 00:19
| We will do this with the help of some examples.

|-
| 00:23
| For this tutorial I am using

|-
| 00:26
| *'''Ubuntu Linux 12.04''' Operating System

|-
| 00:30
| *'''GNU BASH''' version '''4.1.10'''

|-
| 00:34
| '''GNU Bash''' version '''4''' or above, is recommended for practice .

|-
| 00:39
| I already have a working example of arithmetic operators.

|-
| 00:43
| Let me switch to it.

|-
| 00:45
| I have named the file '''example1.sh'''

|-
| 00:50
| Open a file in any editor of your choice and type the code as shown.

|-
| 00:56
| You must be familiar how to do so, by now.

|-
| 01:00
| In this program, we will check whether a given file is empty or not.

|-
| 01:06
| Let me explain the code.

|-
| 01:08
| This is the '''shebang line'''.

|-
| 01:10
| First of all, “'''Enter filename”''' will be printed on the '''console.'''

|-
| 01:15
| '''read''' command reads one line of data from the '''standard input.'''

|-
| 01:20
| This command is enclosed within '''backticks.'''

|-
| 01:24
| '''Backtick''' has a very special meaning.

|-
| 01:27
| Everything you type between '''backtick''' is evaluated.

|-
| 01:32
| '''cat''' command will display the content of the file.

|-
| 01:37
| '''wc''' will print newline, word, and byte counts, for each file.

|-
| 01:43
| '''- (hyphen) w''' will print the word count.

|-
| 01:47
| What will happen is -

|-
| 01:49
| * First the '''cat''' command will read the file.

|-
| 01:53
| This is the input file.

|-
| 01:55
| * Which is then piped or sent to the '''wc''' command.

|-
| 02:00
| * So, this statement counts the words in a given file.

|-
| 02:05
| * The output is stored in variable '''x.'''

|-
| 02:08
| This is the '''if statement'''

|-
| 02:10
| '''- (hyphen) eq''' command checks whether word count is equal to zero.

|-
| 02:16
| If the condition is '''true,''' we will print a message '''“File has zero words”.'''

|-
| 02:22
| '''fi''' is the end of first '''if''' condition.

|-
| 02:26
| Here is another '''if''' condition.

|-
| 02:28
| Here, '''- (hyphen) ne''' command checks whether word count is not equal to zero.

|-
| 02:35
| If the condition is '''true,''' we print '''“File has so-and-so words”'''.

|-
| 02:40
| '''$ (dollar) x''' will give the word count.

|-
| 02:43
| This is the end of 2nd '''if '''condition.

|-
| 02:46
| Save your '''program''' file.

|-
| 02:48
| let us execute our '''program.'''

|-
| 02:51
| Open the '''terminal'''.

|-
| 02:53
| First let's create a file '''list.txt'''

|-
| 02:57
| Type: '''touch list.txt'''

|-
| 03:01
| Now, let's add a line in the file.

|-
| 03:04
| Type:
'''echo within double quotes “How are you” after the double quotes greater than sign list.txt'''

|-
| 03:13
| Now let's make our script executable.

|-
| 03:16
| Type:
'''chmod plus x example1 dot sh'''

|-
| 03:21
| Now type '''dot slash example1.sh'''

|-
| 03:26
| '''Enter filename ''' is displayed.

|-
| 03:28
| Type:
'''list.txt'''

|-
| 03:31
| The output is displayed as: '''list.txt has 3 words'''

|-
| 03:36
| Now let's learn about another set of operators.

|-
| 03:40
| Let me switch to another file.

|-
| 03:43
| This is '''example2.sh '''.

|-
| 03:46
| Please open a file in your editor and name it as '''example2.sh'''

|-
| 03:52
| Now type the code as shown here in your ''' example2.sh''' file.

|-
| 03:58
| Let me explain the code.

|-
| 04:00
| This program will check whether the word count is

|-
| 04:04
| * greater or less than one

|-
| 04:07
| * Between one and hundred Or above hundred.

|-
| 04:11
| We have our '''shebang line''' here.

|-
| 04:14
| '''read ''' statement takes input as filename from the user.

|-
| 04:19
| Here, '''- (hyphen) c''' command is used to print the byte counts.

|-
| 04:24
| In the '''if statement''', '''- (hyphen) lt''' command checks whether word count is less than one.

|-
| 04:31
| If the condition is '''true,''' then we print '''“No characters present in the file”.'''

|-
| 04:37
| '''fi''' ends the '''if condition.'''

|-
| 04:40
| The next '''if statement''' contains a nested '''if statement.'''

|-
| 04:45
| First the '''- (hyphen) gt''' command checks whether word count is greater than one.

|-
| 04:51
| If yes, then this '''echo statement ''' will be executed.

|-
| 04:56
| There are multiple conditions within this '''if statement.'''

|-
| 05:01
| Here, in this '''if'''
* '''- (hyphen) ge '''command checks whether word count is greater than or equal to one

|-
| 05:09
| * and '''- (hyphen) le '''command checks whether word count is less than or equal to hundred.

|-
| 05:17
| If both the conditions are satisfied, then it prints:

|-
| 05:21
| '''Number of characters ranges between 1 and 100.'''

|-
| 05:25
| Please note that both conditions should be true to satisfy the entire '''if condition'''.

|-
| 05:33
| This is because we have included ampersand in-between both the conditions.

|-
| 05:39
| '''fi''' is the end of this '''if statement'''.

|-
| 05:43
| Then the next '''if statement '''will be evaluated.

|-
| 05:47
| '''- (hyphen) gt '''command checks whether word count is greater than hundred.

|-
| 05:53
| If the condition is satisfied, we print '''Number of characters is above hundred.'''

|-
| 06:00
| '''fi '''is the end of '''if statement.'''

|-
| 06:04
| Here we end the 2nd '''if statement'''.

|-
| 06:07
| Now come back to our '''terminal'''.

|-
| 06:10
| Let us execute the program.

|-
| 06:13
| '''chmod plus x example2 dot sh'''

|-
| 06:18
| '''dot slash example2 dot sh'''

|-
| 06:22
| Type '''list.txt '''

|-
| 06:25
| The output is displayed as '''list.txt''' has more than one character.

|-
| 06:31
| '''Number of characters ranges between one and hundred '''''

|-
| 06:36
| Now, add or remove characters to the '''list.txt''' file.

|-
| 06:40
| Then observe which '''if statement''' gets executed.

|-
| 06:46
| This brings us to the end of this tutorial.

|-
| 06:49
| Let us summarize.

|-
| 06:51
| In this tutorial we learnt,
* '''equal to'''
* '''not equal to'''
* '''less than'''
* '''less than equal to'''
* '''greater than''' and
* '''greater than equal to''' commands

|-
| 07:03
| As an assignment, write a program to demonstrate the use of '''not equal to''' operator.

|-
| 07:09
| Hint: '''- (hyphen) ne'''

|-
| 07:12
| Watch the video available at the link shown below

|-
| 07:15
| It summarises the Spoken Tutorial project

|-
| 07:18
| If you do not have good bandwidth, you can download and watch it

|-
| 07:23
| The Spoken Tutorial Project Team

|-
| 07:25
| Conducts workshops using spoken tutorials

|-
| 07:28
| Gives certificates to those who pass an online test

|-
| 07:32
| For more details, please write to contact@spoken-tutorial.org

|-
| 07:40
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 07:43
| It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 07:51
| More information on this Mission is available at the link shown below.

|-
| 07:56
| The script has been contributed by FOSSEE and spoken-tutorial team.

|-
| 08:02
| This is Ashwini Patil from IIT Bombay signing off.

|-
| 08:06
| Thank you for joining.

|}

@@ Line 13: / Line 13: @@
 |-
 |  00:09
-|  '''equal to (-eq)'''
+|  '''equal to (-eq)''' '''not equal to (-ne)'''
-−
-|-
-|  00:10
-|  '''not equal to (-ne)'''
 |-
 |  00:12
-| '''less than (-lt)'''
+| '''less than (-lt)''''''less than equal to (-le)'''
-−
-|-
-|  00:13
-| '''less than equal to (-le)'''
 |-
 |  00:15
-| '''greater than (-gt)''' and
+| '''greater than (-gt)''' and'''greater than equal to (-ge)''' '''commands'''.
-−
-|-
-|  00:16
-| '''greater than equal to (-ge)''' '''commands'''.
 |-
@@ Line 250: / Line 238: @@
 |-
-|   03:52
+|03:52
-|  Now type the code as shown here, in your "example2.sh" file.
+|Now type the code as shown here, in your "example2.sh" file.
 |-
 | 03:58
-|  Let me explain the code.
+|Let me explain the code.
 |-
-|  04:00
+|04:00
-|  This program will check whether the word count is-
+|This program will check whether the word count is-
 |-

@@ Line 13: / Line 13: @@
 |-
 |  00:09
-| * '''equal to (-eq)'''
+|  '''equal to (-eq)'''
 |-
 |  00:10
-| * '''not equal to (-ne)'''
+|  '''not equal to (-ne)'''
 |-
 |  00:12
-|* '''less than (-lt)'''
+| '''less than (-lt)'''
 |-
 |  00:13
-|* '''less than equal to (-le)'''
+| '''less than equal to (-le)'''
 |-
 |  00:15
-|* '''greater than (-gt)''' and
+| '''greater than (-gt)''' and
 |-
 |  00:16
-|* '''greater than equal to (-ge)''' '''commands'''.
+| '''greater than equal to (-ge)''' '''commands'''.
 |-
@@ Line 45: / Line 45: @@
 |-
 | 00:26
-| * '''Ubuntu Linux 12.04''' Operating System
+|  '''Ubuntu Linux 12.04''' Operating System
 |-
 | 00:30
-| *'''GNU BASH''' version '''4.1.10'''
+| '''GNU BASH''' version '''4.1.10'''
 |-
@@ Line 263: / Line 263: @@
 |-
 |  04:04
-| * greater or less than one
+|  greater or less than one
 |-
 | 04:07
-| * Between one and hundred or above hundred.
+|  Between one and hundred or above hundred.
 |-
@@ Line 312: / Line 312: @@
 | 05:01
 | Here, in this '''if''':
-* '''- (hyphen) ge '''command checks whether word count is greater than or equal to one and
+'''- (hyphen) ge '''command checks whether word count is greater than or equal to one and
 |-
 | 05:09
-|* '''- (hyphen) le '''command checks whether word count is less than or equal to hundred.
+| '''- (hyphen) le '''command checks whether word count is less than or equal to hundred.
 |-
@@ Line 403: / Line 403: @@
 |-
-| 06:51
+|06:51
-|  In this tutorial we learnt:
+|In this tutorial we learnt:
-* '''equal to'''
+'''equal to'''
-* '''not equal to'''
+'''not equal to'''
-* '''less than'''
+'''less than'''
-* '''less than equal to'''
+'''less than equal to'''
-* '''greater than''' and
+'''greater than''' and
-* '''greater than equal to''' '''commands'''.
+'''greater than equal to''' '''commands'''.
 |-

@@ Line 1: / Line 1: @@
 {| border=1
-!Time
+|'''Time'''
-!Narration
+|'''Narration'''
 |-

@@ Line 13: / Line 13: @@
 |-
 |  00:01
-|  Welcome to the '''spoken tutorial''' on '''Arithmetic Comparison''' in '''BASH'''
+|  Welcome to the '''spoken tutorial''' on '''Arithmetic Comparison''' in '''BASH'''.
 |-

@@ Line 21: / Line 21: @@
 |-
 |  00:09
-| * '''equal to'''
+| * '''equal to (-eq)'''
 |-
 |  00:10
-| * '''not equal to'''
+| * '''not equal to (-ne)'''
 |-
 |  00:12
-|* '''less than'''
+|* '''less than (-lt)'''
 |-
 |  00:13
-|* '''less than equal to'''
+|* '''less than equal to (-le)'''
 |-
 |  00:15
-|* '''greater than''' and
+|* '''greater than (-gt)''' and
 |-
 |  00:16
-|* '''greater than equal to''' '''commands'''.
+|* '''greater than equal to (-ge)''' '''commands'''.
 |-
@@ Line 145: / Line 145: @@
 |-
 |  02:00
-| So, this '''statement''' counts the words in a given file.
+| So, this statement counts the words in a given file.
 |-
@@ Line 161: / Line 161: @@
 |-
 |  02:16
-| If the condition is '''True,''' we will print a message '''“File has zero words”.'''
+| If the condition is '''True,''' we will print a message '''"File has zero words”.'''
 |-
 |  02:22
-| '''fi''' is the end of first '''if''' condition.
+| '''"fi"''' is the end of first '''if''' condition.
 |-
@@ Line 181: / Line 181: @@
 |-
 |  02:40
-| '''$ (dollar) x''' will give the word count.
+| '''$x (dollar x)''' will give the word count.
 |-
@@ Line 193: / Line 193: @@
 |-
 |  02:48
-| Let us '''execute''' our '''program.'''
+| Let us '''execute''' our program.
 |-
@@ Line 231: / Line 231: @@
 |-
 | 03:26
-| '''Enter filename: ''' is displayed.
+| '''"Enter filename:" ''' is displayed.
 |-
 | 03:28
-| Type:
+| Type: '''list.txt'''
 '''list.txt'''
 |-
 | 03:31
-| The output is displayed as: '''list.txt has 3 words'''.
+| The output is displayed as: '''"list.txt has 3 words"'''.
 |-
@@ Line 256: / Line 255: @@
 |-
 | 03:46
-|  Please open a file in your '''editor''' and name it as '''example2.sh'''
+|  Please open a file in your '''editor''' and name it as "example2.sh".
 |-
 |   03:52
-|  Now type the code as shown here in your ''' example2.sh''' file.
+|  Now type the code as shown here, in your "example2.sh" file.
 |-
@@ Line 300: / Line 299: @@
 |-
 |  04:37
-| '''fi''' ends the '''if condition.'''
+| '''"fi"''' ends the '''if condition.'''
 |-
@@ Line 308: / Line 307: @@
 |-
 |  04:45
-| First, the '''- (hyphen) gt''' command checks whether word count is greater than one.
+| First,  '''- (hyphen) gt''' command checks whether word count is greater than one.
 |-
 |  04:51
-| If yes, then this '''echo statement ''' will be executed.
+| If 'yes' then this '''echo statement ''' will be executed.
 |-
@@ Line 333: / Line 332: @@
 |-
 | 05:21
-| '''Number of characters ranges between 1 and 100.'''
+| '''"Number of characters ranges between 1 and 100".'''
 |-
 | 05:25
-| Please note that both '''conditions''' should be true to satisfy the entire '''if condition'''.
+| Please note that both '''conditions''' should be '''True''' to satisfy the entire '''if condition'''.
 |-
@@ Line 345: / Line 344: @@
 |-
 | 05:39
-| '''fi''' is the end of this '''if statement'''.
+| '''"fi"''' is the end of this '''if statement'''.
 |-
@@ Line 357: / Line 356: @@
 |-
 |  05:53
-| If the condition is satisfied, we print '''Number of characters is above hundred.'''
+| If the condition is satisfied, we print '''"Number of characters is above hundred".'''
 |-
 |  06:00
-| '''fi '''is the end of '''if statement.'''
+| '''"fi" '''is the end of '''if statement.'''
 |-
@@ Line 389: / Line 388: @@
 |-
 |  06:25
-|   The '''output''' is displayed as '''list.txt has more than one character'''.
+|   The '''output''' is displayed as '''"list.txt has more than one character"'''.
 |-
 | 06:31
-| '''Number of characters ranges between one and hundred'''.
+| '''"Number of characters ranges between one and hundred"'''.
 |-
@@ Line 423: / Line 422: @@
 |-
 |  07:03
-|  As an assignment, write a program to demonstrate the use of '''not equal to''' operator.
+|  As an assignment, write a program to demonstrate the use of '''not equal to''' '''operator'''.
 |-
 |  07:09
-| Hint: '''- (hyphen) ne'''
+| Hint: '''- (hyphen) ne'''.
 |-