Tuesday, March 26, 2019

The UNIX Programmer - Part 1



The following are some fun UNIX exercises to utilize to sharpen your skill set.

The boss has asked you to show your new UNIX intern how to format a report in the following manner – since these are the kinds of reports the intern will be creating all summer long:

1) Output the word count of a report1 then append it to the existing report2:

            Answer: wc –l report1 >> report2
 

2) Using awk show how to extract column 5 (the file size) from the output of ls -l

            Answer: ls –l | awk ‘{print $5}’
 

3) Using sed show how to substitute a change in words globally taking the input from a file

            Answer: sed –e ‘s/platform/computer/g’ < file.txt


4) Using tr convert a file from uppercase to lowercase

            Answer: tr ‘A-Z’ ‘a-z’ < file.txt

 
5) Using grep to search for text in a file at the beginning of a line that starts with the word the

            Answer: grep ‘^The’ the.sh

 
6) Using grep to search for text in a file at the end of a line with the word of

            Answer: grep ‘of$’ the.sh
 

7) Use grep to search for a dollar sign in a file 

            Answer: grep ‘.$’ the.sh

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