Sed & Awk

Without the -n option, what will the following sed command print to the terminal? | sed '/line/' readme.txt

• All lines that include 'line'

• All lines and the lines including "line" (some duplicates)

• Will print the line numbers

• All of the lines in the file

What will the following command print? | sed -n '4,20 p' readme.txt

• All lines and lines 4-20 (duplicates)

• Only lines 4-20

• Only line 4 and 20

• Lines 5-19

What will the following command do? | sed 's/hello/goodbye/' readme

• Find the first instance of hello in each line and replace it with goodbye

• Add hello after every goodbye in the file

• Search for "hello" and "goodbye" and print to screen

• Replace all instances of "hello" with "goodbye"

What will the following command do? | sed 's/hello/goodbye/g' readme

• Substitute all instances of "hello" with "goodbye" and print to screen

• Find the first instance of "hello" in each line and replace it with "goodbye" and print to screen

• Substitute all instances of "hello" and replace it with "goodbye" but write the changes to the file

• Shut down the computer and print Hello Goodbye

What option for sed will write changes to the file?

• -c

• -n

• -i or --in-place

• -l

What will the following awk command do with no pattern?

awk '{ print }' readme.txt

• Print all lines

• Delete all lines

• Print the first line

• Will not do anything

What will the following awk command do with no action?

awk '/chevy/' cars

• Print lines including "chevy"

• Print all lines

• Will not print anything

• Error: you need an action

What will the following command do?

awk '{print $3 $1}' cars

• Print column 3 and 1 concatenated

• Print column 3 and 1 with a space in between

• Print line 3 and 1 with space in between

• Print line 3 and 1 concatenated

What will the following command do?

awk '$1 ~ /h/' cars

• select all lines that have letter h in the first field

• select first line if it has a letter h in it

• select all lines that has the letter h in them

• substitute letter h with the symbol ~, in the first line

what would be the result of the following command:

awk '$3 ~/5$/ {print $3, $1, "$" $5}' cars

• printing column 3 [space] column 1 [space] column 5

• printing column 3 [space] column 1 [space] $column 5

• printing column 3 column 1 $column 5

• printing column 3 column 1 column 5