Using CheatSheets To Apply Best Practices

Sed Cheatsheet

Sed Cheatsheet

1.1 Advanced sed

Name Command
Update with auto backup sed -i.bak 's/localhost/myhost/g' my-file, ls my-file*, Link: my-file
Use variables in sed newip=’127.0.1.1′; sed -i "s/127.0.0.1/$newip/g" my-file Link: unix.com
Only replace the first match sed -i '0,/localhost/{s/localhost/newstring/}' my-file Link: stackoverflow
Replace multiple lines sed -i ':a;N;$!ba;s/Host.*localhost//g' my-file Link: stackexchange
Add a new line to 3th line sed -i "3i mynew string" my-file
Insert a line of text before a line sed -i '/KUBELET_NETWORK_ARGS/i newline' my-file

1.2 GNUS sed – delete

Name Command
Replace string sed -i 's/127.0.0.1/127.0.1.1/g' my-file Link: my-file
Use a different seperator sed -i 's#127.0.0.1#127.0.1.1#g' my-file
Use a different seperator sed -i 's#https://www.test.com/test#http://www.try.com#g' my-file
Delete pattern sed '/KUBELET_NETWORK_ARGS.*/d' my-file
Delete matched lines sed -i 's/.*KUBELET_NETWORK_ARGS.*//g' my-file
Delete whitespace sed -i 's/ //g' my-file
Delete empty lines sed -i '/^$/d' my-file
Delete 2nd to 4th lines sed -i '2,4d' my-file
Delete leading whitespace sed -i 's/^[ \t]*//' my-file
Delete trailing whitespace sed -i 's/[ \t]*$//' my-file

1.3 GNUS sed – insertion

Name Command
Insert string to the begining of lines sed -i 's/^/head /g' my-file
Insert string to the end of lines sed -i 's/$/ tail/g' my-file
Add content after nth line sed -n -i 'p;3a "new string"' my-file, cat -n my-file Link: unix.com
Add a new line to 3th line sed -i "3i mynew string" my-file
Insert a line of text before a line sed -i '/KUBELET_NETWORK_ARGS/i newline' my-file

1.4 GNUS sed – review

Name Command
Print lines from 2nd to 6th sed -n '2,6p' my-file

1.5 Freebsd sed on Mac

Name Command
In-place sed sed -i "" 's/127.0.0.1/127.0.1.1/g' my-file, link:stackoverflow


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