Here is the list of sed commands with examples
1. list content of file myfile
# [localhost@localhost ~] $ cat myfile
apple
orange
mango
banana
GUAVA
ra dish
pineapple
2. delete the first line of the file
# [localhost@localhost ~] $ sed '1d' myfile
orange
mango
banana
GUAVA
ra dish
pineapple
3. delete the third line of the file
# [localhost@localhost ~] $ sed '3d' myfile
apple
orange
banana
GUAVA
ra dish
pineapple
4. delete the last line of the file
# [localhost@localhost ~] $ sed '$d' myfile
apple
orange
mango
banana
GUAVA
ra dish
5. delete the 2nd and 4th line of the file
# [localhost@localhost ~] $ sed '2,4d' myfile
apple
banana
GUAVA
ra dish
pineapple
6. delete except the 2nd and 4th line of the file
# [localhost@localhost ~] $ sed '2,4!d' myfile
orange
mango
7. delete the 1st and last line of the file
# [localhost@localhost ~] $ sed '1d;$d' myfile
orange
mango
banana
GUAVA
ra dish
8. delete all lines beginning with character 'a'
# [localhost@localhost ~] $ sed '/^a/d' myfile
orange
mango
banana
GUAVA
ra dish
pineapple
9. delete all lines ending with character 'e'
# [localhost@localhost ~] $ sed '/e$/d' myfile
mango
banana
GUAVA
ra dish
10. delete all lines ending with either 'e' or 'E'
# [localhost@localhost ~] $ sed '/# [eE] $/d' myfile
mango
banana
GUAVA
ra dish
11. delete all the blank lines
# [localhost@localhost ~] $ sed '/^$/d' myfile
apple
orange
mango
banana
GUAVA
ra dish
pineapple
12. delete all lines which are entirely in UPPER CASE or CAPITAL LETTER
# [localhost@localhost ~] $ sed '/^# [A-Z]*$/d' myfile
apple
orange
mango
banana
ra dish
pineapple
13. delete all lines containing the pattern 'an'
# [localhost@localhost ~] $ sed '/an/d' myfile
apple
GUAVA
ra dish
pineapple
14. delete all lines not containing the pattern 'an'
# [localhost@localhost ~] $ sed '/an/!d' myfile
orange
mango
banana
15. delete all lines containing the pattern 'an' or 'le'
# [localhost@localhost ~] $ sed '/an\|le/d' myfile
GUAVA
ra dish
16. delete lines starting from 1st until meeting the PATTERN 'banana'
# [localhost@localhost ~] $ sed '1,/banana/d' myfile
GUAVA
ra dish
pineapple
17. delete lines meeting the PATTERN 'banana' till the LAST line
# [localhost@localhost ~] $ sed '/banana/,$d' myfile
apple
orange
mango
18. delete the last line only if it contains the PATTERN 'apple'
# [localhost@localhost ~] $ sed '${/apple/d;}' myfile
apple
orange
mango
banana
GUAVA
ra dish