12) Replace the period right after the line number by a colon on each line and save the output to a new file "newCompanyList.txt". 13) Use awk to finish task in 11) by reading file "newCompanyList.txt. 14) Use sort to print out the sorted lines in alphabetical order according to the name of location in CompanyList.txt. 15) "When a pattern groups all or part of its content into a pair of parentheses, it captures that content and stores it temporarily in memory. You can reuse that content if you wish by using a back-reference, in the form:11 or $1, where \1 or $1 reference the first captured group" (Refer to [1]). For example, the following command reverse "Atlanta" and "GA" sed -E 's/(Atlanta), s (GA)/12-11/g' CompanyList.txt Attach a screenshot of the output of the above sed command. 16) Now can you write a command to finish task 11) using sed with back-reference? 12) Replace the period right after the line number by a colon on each line and save the output to a new file "newCompanyList.txt". 13) Use awk to finish task in 11) by reading file "newCompanyList.txt. 14) Use sort to print out the sorted lines in alphabetical order according to the name of location in CompanyList.txt. 15) "When a pattern groups all or part of its content into a pair of parentheses, it captures that content and stores it temporarily in memory. You can reuse that content if you wish by using a back-reference, in the form:11 or $1, where \1 or $1 reference the first captured group" (Refer to [1]). For example, the following command reverse "Atlanta" and "GA" sed -E 's/(Atlanta), s (GA)/12-11/g' CompanyList.txt Attach a screenshot of the output of the above sed command. 16) Now can you write a command to finish task 11) using sed with back-reference