QUESTION 16 The command sed \'s/\\(.*\\):\\(.*\\):\\(.*\\):\\(.*\\)/\\3:\\4:\\2:

Question

QUESTION 16

The command

sed 's/(.*):(.*):(.*):(.*)/:::
/'

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

True

False

2 points   

QUESTION 17

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

True

False

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.

Explanation / Answer

QUESTION 16 - The command sed 's/(.*):(.*):(.*):(.*)/:::
/' swaps the first and third colums, and the second and forth colums of a colon separated list. - FALSE

QUESTION 17 - TRUE (tr command in this Question will swap the lower and upper case letters accordingly

QUESTION 18 - True

QUESTION 19 - FALSE

QUESTION 20 - TRUE the current working directory will be /tmp if checked via PWD commad

Please let me know in case of any clarifications required. Thanks!

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