QUESTION 16

The command

sed 's/\(.*\):\(.*\):\(.*\):\(.*\)/\3:\4:\2:\1/'

swaps the first and third colums, and the second and forth colums of a colon separated list.

True

False

2 points

QUESTION 17

The command

tr 'a-z' 'A-Z' | tr 'A-Z' 'a-z'

translates all lower case letters to upper case and all upper case letters to lower case.

After the command is run, case of the input stream will be swapped.

True

False

2 points

QUESTION 18

The command

ls | paste - -

lists all files in the current directory in three columns

True

False

2 points

QUESTION 19

Filename subsitution always happens on variable assignment.

True

False

2 points

QUESTION 20

After the following command executes

cd /; tar cf - etc | ( cd /tmp;tar -xf - )

The value of the current working directory $PWD would be /tmp

True

False