sed

Question 1

The sed Command definition:

Answer 1

This command displays the contents of a file or stream. (Just like cat).

** The original file does not get affected by sed. **

Question 2

The sed Command syntax:

Answer 2

sed options ‘address action’ file(s)

Question 3

sed -n

Answer 3

This suppresses the display of all lines when the p (print) action is used

Question 4

p

Answer 4

prints lines on standard output

Question 5

d

Answer 5

delete lines

Question 6

s (sed)

Answer 6

• sed action
• substitution (special format)

s/searchText/replacementText/ replaces first occurrence on lines

s/searchText/replacementText/g replaces all occurrences on lines

Question 7

^ (sed)

Answer 7

The beginning of a line

Question 8

q

Answer 8

quits after reading up to addressed line

Question 9

r filename

Answer 9

places contents of file filename after line

Question 10

w filename

Answer 10

writes addressed lines to file filename

Question 11

=

Answer 11

prints line number addressed

Question 12

s/s1/s2/

Answer 12

Replaces first occurrence of expression s1 in all lines with expression s2

Question 13

s/s1/s2/g

Answer 13

As above but replaces all occurrences