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Question: Construct pipes to execute the following jobs.

Answer: 1. Output of who should be displayed on the screen with value of total number of users who have logged in displayed at the bottom of the list.
2. Output of ls should be displayed on the screen and from this output the lines containing the word ?poem? should be counted and the count should be stored in a file.
3. Contents of file1 and file2 should be displayed on the screen and this output should be appended in a file. From output of ls the lines containing ?poem? should be displayed on the screen along with the count.
4. Name of cities should be accepted from the keyboard . This list should be combined with the list present in a file. This combined list should be sorted and the sorted list should be stored in a file ?newcity?.
5. All files present in a directory dir1 should be deleted any error while deleting should be stored in a file ?errorlog?.



Category Unix Commands Interview Questions & Answers - Exam Mode / Learning Mode
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Question: Construct pipes to execute the following jobs.
Answer:

1. Output of who should be displayed on the screen with value of total number of users who have logged in displayed at the bottom of the list.
2. Output of ls should be displayed on the screen and from this output the lines containing the word ?poem? should be counted and the count should be stored in a file.
3. Contents of file1 and file2 should be displayed on the screen and this output should be appended in a file. From output of ls the lines containing ?poem? should be displayed on the screen along with the count.
4. Name of cities should be accepted from the keyboard . This list should be combined with the list present in a file. This combined list should be sorted and the sorted list should be stored in a file ?newcity?.
5. All files present in a directory dir1 should be deleted any error while deleting should be stored in a file ?errorlog?. Source: CoolInterview.com


1.who|wc -l
2.ls|wc -c|grep "^poem$" >file
3.ls|wc -c|cat>file1>>file2
4.cat>>$city| sort >newcity
5.rm -r > errorlog Source: CoolInterview.com

Answered by: neha | Date: 9/16/2007 5:45:19 AM | Contact neha Contact neha

The 2nd answer is jumbled. Here is the correct sequence.

ls | grep ^poem$" | wc -c > file Source: CoolInterview.com

Answered by: Dinesh Sehra | Date: 7/25/2009 | Contact Dinesh Sehra Contact Dinesh Sehra

it is wc -l in the second and third results

as wc -l>>>count the lines
and wc -c>>count the words Source: CoolInterview.com

Answered by: correction for the above | Date: 11/7/2009 | Contact correction for the above Contact correction for the above

the answer for number 3 is the following:

cat file1 file2>>file3|ls| wc -l |grep "^poem$"
Source: CoolInterview.com

Answered by: correction for the above | Date: 11/7/2009 | Contact correction for the above Contact correction for the above

I think answer of fifth one should be:

rm -r 2>errorlog

because of error occurs the only we have to direct the output to a file. hence 2>errlog is required.
Source: CoolInterview.com

Answered by: anshuman | Date: 2/6/2010 | Contact anshuman Contact anshuman

The answer for second should be:-

ls|grep poems|wc -l Source: CoolInterview.com

Answered by: Sunny | Date: 5/29/2010 | Contact Sunny Contact Sunny


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