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the sub command is a stream editor but i think of it as mostly a utility that i use to read in a file and make substitutions make replacements for one pattern match to another for instance if i have a file like this sample here i can see a series of lines with key value properties and so i can go in using a set command and i can cap this and then pipe it to said and say give me a replacement of all spaces with commas and if i close up the pattern like that and in the string i can run it and youll see for each line itll go through and itll find the first space and replace it with a comma it leaves the other spaces in place though if i were to add the g then it would apply globally and so all of the spaces would be replaced with a comma this is kind of what saids built for its not so great when you want to do something like a new line replacement because sed really isnt meant to handle that but we can make said do it anyway because its pretty powerful and theres a lot of differen