1. list content of file myfile
\n# [localhost@localhost ~] $ cat myfile
\napple
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish
\npineapple<\/p>\n
2. delete the first line of the file
\n# [localhost@localhost ~] $ sed ‘1d’ myfile
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish
\npineapple<\/p>\n
3. delete the third line of the file
\n# [localhost@localhost ~] $ sed ‘3d’ myfile
\napple
\norange<\/p>\n
banana
\nGUAVA
\nra dish
\npineapple<\/p>\n
4. delete the last line of the file
\n# [localhost@localhost ~] $ sed ‘$d’ myfile
\napple
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish<\/p>\n
5. delete the 2nd and 4th line of the file
\n# [localhost@localhost ~] $ sed ‘2,4d’ myfile
\napple
\nbanana
\nGUAVA
\nra dish
\npineapple<\/p>\n
6. delete except the 2nd and 4th line of the file
\n# [localhost@localhost ~] $ sed ‘2,4!d’ myfile
\norange
\nmango<\/p>\n
7. delete the 1st and last line of the file
\n# [localhost@localhost ~] $ sed ‘1d;$d’ myfile
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish<\/p>\n
8. delete all lines beginning with character ‘a’
\n# [localhost@localhost ~] $ sed ‘\/^a\/d’ myfile
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish
\npineapple<\/p>\n
9. delete all lines ending with character ‘e’
\n# [localhost@localhost ~] $ sed ‘\/e$\/d’ myfile
\nmango<\/p>\n
banana
\nGUAVA
\nra dish<\/p>\n
10. delete all lines ending with either ‘e’ or ‘E’
\n# [localhost@localhost ~] $ sed ‘\/# [eE] $\/d’ myfile
\nmango<\/p>\n
banana
\nGUAVA
\nra dish<\/p>\n
11. delete all the blank lines
\n# [localhost@localhost ~] $ sed ‘\/^$\/d’ myfile
\napple
\norange
\nmango
\nbanana
\nGUAVA
\nra dish
\npineapple<\/p>\n
12. delete all lines which are entirely in UPPER CASE or CAPITAL LETTER
\n# [localhost@localhost ~] $ sed ‘\/^# [A-Z]*$\/d’ myfile
\napple
\norange
\nmango
\nbanana
\nra dish
\npineapple<\/p>\n
13. delete all lines containing the pattern ‘an’
\n# [localhost@localhost ~] $ sed ‘\/an\/d’ myfile
\napple<\/p>\n
GUAVA
\nra dish
\npineapple<\/p>\n
14. delete all lines not containing the pattern ‘an’
\n# [localhost@localhost ~] $ sed ‘\/an\/!d’ myfile
\norange
\nmango
\nbanana<\/p>\n
15. delete all lines containing the pattern ‘an’ or ‘le’
\n# [localhost@localhost ~] $ sed ‘\/an\\|le\/d’ myfile<\/p>\n
GUAVA
\nra dish<\/p>\n
16. delete lines starting from 1st until meeting the PATTERN ‘banana’
\n# [localhost@localhost ~] $ sed ‘1,\/banana\/d’ myfile
\nGUAVA
\nra dish
\npineapple<\/p>\n
17. delete lines meeting the PATTERN ‘banana’ till the LAST line
\n# [localhost@localhost ~] $ sed ‘\/banana\/,$d’ myfile
\napple
\norange
\nmango<\/p>\n
18. delete the last line only if it contains the PATTERN ‘apple’
\n# [localhost@localhost ~] $ sed ‘${\/apple\/d;}’ myfile
\napple
\norange
\nmango<\/p>\n
banana
\nGUAVA
\nra dish<\/p>\n","protected":false},"excerpt":{"rendered":"
1. list content of file myfile # [localhost@localhost ~] $ cat myfile apple orange mango<\/p>\n
banana GUAVA ra dish pineapple<\/p>\n
2. delete the first line of the file # [localhost@localhost ~] $ sed ‘1d’ myfile orange mango<\/p>\n
banana GUAVA ra dish pineapple<\/p>\n
3. delete the third line of the file # [localhost@localhost ~] $ sed […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,17],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5233"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5233"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5233\/revisions"}],"predecessor-version":[{"id":5234,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5233\/revisions\/5234"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5233"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5233"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}