Difference between revisions of "BASH/C3/More-on-Redirection/Gujarati"
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Revision as of 10:53, 9 February 2015
| Timee | Narration |
| 00:01 | નમસ્તે મિત્રો More on redirection પરનાં સ્પોકન ટ્યુટોરીયલમાં સ્વાગત છે. |
| 00:07 | આ ટ્યુટોરીયલમાં, આપણે શીખીશું standard error અને output બંનેનું રીડાયરેક્શન |
| 00:13 | રીડાઈ રેક્ટ કરેલ આઉટપુટ ઉમેરવા. |
| 00:15 | ઉમુક ઉદાહરણ સાથે સમજીએ. |
| 00:19 | આ ટ્યુટોરીયલનાં અનુસરણ માટે તમને બેશમાંનાં Shell Scripting નું જ્ઞાન હોવું અનિવાર્ય છે. |
| 00:25 | જો નથી, તો સંદર્ભિત ટ્યુટોરીયલો માટે કૃપા કરી દર્શાવેલ અમારી વેબસાઈટનો સંદર્ભ લો, http://www.spoken-tutorial.org |
| 00:30 | આ ટ્યુટોરીયલ માટે હું વાપરી રહી છું. ઉબુન્ટુ લીનક્સ 12.04 ઓપરેટીંગ સીસ્ટમ અને |
| 00:35 | GNU BASH આવૃત્તિ 4.2 |
| 00:39 | કૃપા કરી નોંધ લો, આ ટ્યુટોરીયલનાં અભ્યાસ માટે GNU Bash આવૃત્તિ 4 કે તેથી વધુ આગ્રહ કરીએ છીએ. |
| 00:46 | અગાઉના ટ્યુટોરીયલમાં આપણે શીખ્યા standard output અને standard errors . |
| 00:52 | Both stderr as well as the stdout can be redirected to the same file. |
| 00:58 | This can be done in multiple ways. |
| 01:01 | We will cover two of the most important methods of redirections in this tutorial. |
| 01:08 | The first method to redirect both the standard output and error is by using &>(ampersand) followed by greater-than sign |
| 01:18 | The syntax is Command space ampersand greater than space filename |
| 01:25 | Let me open a file named redirect.sh. |
| 01:30 | I have typed some code in this file. |
| 01:32 | This is the shebang line. |
| 01:36 | ls lists the directory content of 2 directories namely /usr and /user |
| 01:44 | Note that /user directory does not exist. |
| 01:48 | Hence the command ls will throw an error. |
| 01:52 | &(ampersand) followed by greater than will redirect stdout and stderr to out_(underscore)file.txt |
| 02:03 | Now Save the file. |
| 02:05 | Let us run the file redirect.sh. |
| 02:07 | Open the terminal using CTRL+ALT+T keys simultaneously on your keyboard |
| 02:15 | Type chmod space plus x space redirect dot sh |
| 02:23 | Press Enter |
| 02:25 | Type dot slash redirect dot sh |
| 02:28 | Press Enter. |
| 02:30 | We can see the output by opening out_(underscore)file.(dot)txt |
| 02:36 | Type cat space out_(underscore)file.(dot)txt |
| 02:42 | We can see both the error and output. |
| 02:48 | The error for directory /user is recorded in this file. |
| 02:51 | It says that there was no '/user' directory found. |
| 02:56 | The directory content for /usr is displayed. |
| 03:00 | Please note that the content for '/usr' directory may vary on your system. |
| 03:06 | Now let us delete this file. So, on the terminal Type rm space out_(underscore)file. (dot)txt |
| 03:15 | Another method is to use 2 greater than ampersand 1 after the filename |
| 03:24 | The syntax is command space greater than filename space 2 greater than ampersand 1 |
| 03:33 | We can also redirect to slash dev slash null (/dev/null) file. |
| 03:39 | Let us learn a little more about slash dev slash null (/dev/null) file. |
| 03:45 | It is a special kind of file |
| 03:48 | It is a null file or a place where we can dump anything. |
| 03:52 | It includes the output and error messages |
| 03:57 | It is also called as bit bucket. |
| 04:00 | Let us now come back to our code in gedit. |
| 04:04 | Let us redirect both standard output and error to the null file. |
| 04:11 | I will copy this line of code and paste it below over here. |
| 04:16 | I want both the output and error messages to be discarded. |
| 04:21 | So I will change this part of the copied code.> (greater than) means truncate or write. |
| 04:30 | slash dev slash null is the null file 2>&1 (2 greater than ampersand 1) |
| 04:37 | Number “2” will redirect standard error to standard output, denoted by number “1”. |
| 04:45 | Now click on Save. Save the code. |
| 04:48 | Let us run the file redirect.sh. |
| 04:52 | Go to the terminal. |
| 04:54 | Recall the previous command with the up-arrow key. dot slash redirect.sh and press Enter. |
| 05:03 | We can see the output by typing cat out_(underscore)file.(dot)txt |
| 05:11 | Come back to our slides. |
| 05:15 | * We can capture as well as append standard output or error to a file. |
| 05:21 | The output or the error will be appended at the end of the file. |
| 05:26 | If the file does not exist, it will create a new file. |
| 05:31 | The syntax is command space greater than greater than space followed by filename |
| 05:41 | Let us understand this using an example. |
| 05:45 | Let me open the file redirect.(dot)sh |
| 05:49 | Now, here let's Type date space greater than greater than space out_(underscore)file.(dot)txt |
| 06:00 | The 'date' command will simply display the system date as output. |
| 06:06 | We can check this command on the terminal by typing 'date.' |
| 06:11 | Come back to the terminal.Type date You can see that the system date i.e. the current date is displayed. |
| 06:23 | The output of date command will be appended to the out_(underscore)file.(dot)txt file. |
| 06:31 | We are using this file to capture standard output and error of ls command. |
| 06:39 | Click on Save |
| 06:40 | Switch to the terminal. |
| 06:43 | Now press the uparrow key.Recall the previous command dot slash redirect dot sh |
| 06:50 | and press Enter. |
| 06:52 | Let us check the output by opening out_(underscore) file.(dot)txt |
| 06:59 | Type cat space out_(underscore)file.(dot)txt |
| 07:05 | Observe that the output of 'date' command is appended to the end of the file. |
| 07:12 | This brings us to the end of this tutorial. |
| 07:15 | Let us summarise. |
| 07:17 | In this tutorial we learnt |
| 07:19 | Redirection of both standard error and output And to append the redirected output |
| 07:27 | As an assignment, |
| 07:29 | Create X_(underscore)file.(dot)txt file with some content. |
| 07:34 | Redirect the content of both out_(underscore)file.(dot)txt and X_(underscore)file.(dot)txt to a new file. |
| 07:44 | Watch the video available at the link shown below. |
| 07:47 | It summarises the Spoken Tutorial project. |
| 07:51 | If you do not have good bandwidth, you can download and watch it. |
| 07:56 | The Spoken Tutorial Project Team Conducts workshops using spoken tutorials Gives certificates to those who pass an online test |
| 08:06 | For more details, please write to contact@spoken-tutorial.org |
| 08:13 | Spoken Tutorial Project is a part of the Talk to a Teacher project. |
| 08:17 | 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 |
| 08:30 | The script has been contributed by FOSSEE and Spoken-Tutorial teams. |
| 08:37 | This is Ashwini from IIT Bombay.Thank you for joining. |
