sed command examples

Question 1

Sed editing commands

Answer 1

Question 2

Sed options

Answer 2

Question 3

find all the lines containing pattern “erors”

Answer 3

sandy ~> sed ‘/erors/p’ example

This is the first line of an example text.

It is a text with erors. It is a text with erors.

Lots of erors. Lots of erors.

So much erors, all these erors are making me sick.

So much erors, all these erors are making me sick.

This is a line not containing any errors.

This is the last line.

Question 4

only print those lines matching our pattern

Answer 4

sandy ~> sed -n ‘/erors/p’ example

It is a text with erors.

Lots of erors.

So much erors, all these erors are making me sick.

Question 5

see the lines not containing the search string

Answer 5

sandy ~> sed ‘/erors/d’ example

This is the first line of an example text.

This is a line not containing any errors.

This is the last line.

Question 6

Matching lines starting with one pattern and ending in a second pattern

Answer 6

sandy ~> sed -n ‘/^This.*errors.$/p’ example

This is a line not containing any errors.

Question 7

take out the lines containing the errors

Answer 7

sandy ~> sed ‘2,4d’ example

This is the first line of an example text.

This is a line not containing any errors.

This is the last line.

Question 8

print the file starting from a certain line until the end of the file

Answer 8

sandy ~> sed ‘3,$d’ example

This is the first line of an example text.

It is a text with erors.

Question 9

search and replace the errors instead of only (de)selecting the lines containing the search string.

Answer 9

sandy ~> sed ‘s/erors/errors/’ example

This is the first line of an example text.

It is a text with errors. Lots of errors.

So much errors, all these erors are making me sick.

This is a line not containing any errors.

This is the last line.

Question 10

Use the g command to indicate to sed that it should examine the entire line instead of stopping at the first occurrence of your string

Answer 10

sandy ~> sed ‘s/erors/errors/g’ example

This is the first line of an example text.

It is a text with errors.

Lots of errors.

So much errors, all these errors are making me sick.

This is a line not containing any errors.

This is the last line.

Question 11

insert a string at the beginning of each line of a file

Answer 11

sandy ~> sed ‘s/^/> /’ example

> This is the first line of an example text.

> It is a text with erors.

> Lots of erors.

> So much erors, all these erors are making me sick.

> This is a line not containing any errors.

> This is the last line.

Question 12

Insert some string at the end of each line

Answer 12

sandy ~> sed ‘s/$/EOL/’ example

This is the first line of an example text.EOL

It is a text with erors.EOL

Lots of erors.EOL

So much erors, all these erors are making me sick.EOL

This is a line not containing any errors.EOL

This is the last line.EOL

Question 13

Multiple find and replace commands are separated with individual -e options

Answer 13

sandy ~> sed -e ‘s/erors/errors/g’ -e ‘s/last/final/g’ example

This is the first line of an example text.

It is a text with errors.

Lots of errors.

So much errors, all these errors are making me sick.

This is a line not containing any errors.

This is the final line.