{"id":516,"date":"2019-06-01T06:59:16","date_gmt":"2019-06-01T06:59:16","guid":{"rendered":"https:\/\/www.24x7serversupport.com\/24x7serversupport-blog\/?p=516"},"modified":"2019-06-01T06:59:16","modified_gmt":"2019-06-01T06:59:16","slug":"ways-to-use-sed-command","status":"publish","type":"post","link":"https:\/\/www.24x7serversupport.com\/blog\/ways-to-use-sed-command\/","title":{"rendered":"Ways to use sed command"},"content":{"rendered":"\n

View selected lines of a document\/file<\/h3>\n\n\n\n

# sed -n ‘9,20p’ file.txt<\/p><\/blockquote>\n\n\n\n

View the entire file except selected lines<\/h3>\n\n\n\n

# sed ‘21,40d’ file.txt<\/p><\/blockquote>\n\n\n\n

Replacing words or characters in a file<\/h3>\n\n\n\n

# sed ‘s\/centos\/ubuntu\/g’ file.txt<\/p><\/blockquote>\n\n\n\n

To make changes permanent, you can use option ‘-i’<\/p>\n\n\n\n

# sed -i ‘s\/centos\/ubuntu\/g’ file.txt<\/p><\/blockquote>\n\n\n\n

flag \/g (global replacement) <\/p>\n\n\n\n

Use the combination of \/1, \/2 etc and \/g to replace all the patterns from the nth <\/em>occurrence of a pattern in the file.<\/p>\n\n\n\n

# sed ‘s\/centos\/ubuntu\/4g’ file.txt <\/p><\/blockquote>\n\n\n\n

Using regular expressions<\/h3>\n\n\n\n

To remove empty lines or those beginning with\u00a0#<\/code>\u00a0from the Apache configuration file, do:<\/p>\n\n\n\n

# sed ‘\/^#|^$| *#\/d’ my.cnf<\/p><\/blockquote>\n\n\n\n

The caret sign followed by the number sign (^#)<\/code> indicates the beginning of a line, whereas ^$<\/code> represents blank lines. The vertical bars indicate boolean operations, whereas the backward slash is used to escape the vertical bars.<\/p>\n\n\n\n

In this particular case, the Apache configuration file has lines with\u00a0#\u2019s<\/code>\u00a0not at the beginning of some lines, so\u00a0*#<\/code>\u00a0is used to remove those as well.<\/p>\n\n\n\n

To replace a word beginning with uppercase or lowercase with another word, we can also use sed. To illustrate, let\u2019s replace the word\u00a0zip<\/strong>\u00a0or\u00a0Zip<\/strong>\u00a0with rar in file.txt<\/strong>:<\/p>\n\n\n\n

# sed ‘s\/[Zz]ip\/tar.gz\/g’ file.txt<\/p><\/blockquote>\n\n\n\n

Performing multiple substitutions in a single command<\/h3>\n\n\n\n

# sed -i ‘s\/ubuntu\/centos\/gi;s\/plesk\/cpanel\/gi’ file.txt<\/p><\/blockquote>\n\n\n\n

Combine sed with other commands<\/h3>\n\n\n\n

Firstly, replace multiple blank spaces with a single space, we will use the output of\u00a0ip route show<\/code>\u00a0and a pipeline<\/p>\n\n\n\n

Print the lines beginning with src.
Then convert multiple spaces into a single one. Finally, cut the\u00a09th<\/strong>\u00a0field (considering a single space as field separator), which is where the IP address is: <\/p>\n\n\n\n

# ip route show | sed -n ‘\/src\/p’ | sed -e ‘s\/ *\/ \/g’ | cut -d’ ‘ -f9<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

View selected lines of a document\/file # sed -n ‘9,20p’ file.txt View the entire file except selected lines # sed ‘21,40d’ file.txt Replacing words or characters in a file # sed ‘s\/centos\/ubuntu\/g’ file.txt To make changes permanent, you can use option ‘-i’ # sed -i ‘s\/centos\/ubuntu\/g’ file.txt flag \/g (global replacement) Use the combination of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[30,34],"tags":[124,112,125,126,127],"class_list":["post-516","post","type-post","status-publish","format-standard","hentry","category-centos","category-linux","tag-command","tag-linux","tag-sed","tag-send-command","tag-unix"],"jetpack_publicize_connections":[],"yoast_head":"\nWays to use sed command | 24x7serversupport Blog<\/title>\n<meta name=\"description\" content=\"Ways to use sed command on linux and unix systems\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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