So when using the sed command in the terminal we have to write ‘-i’ in after sed to actually rewrite the file and change it. However, we use -i to specificy for the grep command that the search should be case insensitive. Why is -i used differently in these two instances. And further, how do we specifiy case sensitivity (or non-sensitivity) for sed?
These might be helpful:
-i when using the stream editor (sed) means you can edit the file in place
sed writes output to standard output. Use -i to edit files in-place instead of printing to standard output"
-i in grep means ignore case distinctions when searching.
This also might be of use:
So how would you use sed such that it was or wasn’t case sensitive?
grep is used for searching and pattern matching in files.
sed is an editor (that works like regex, I guess) that searches for text that you want to change in files.
To make the search pattern case-insensitive I believe you use the “I” (that’s a capital letter I (eye) not a lowercase l (el) or the pipe, “|” character).
If you have a Mac, OS, Catalina the capital letter “I” does not work:
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