Sed
Sed is a steam editor
- here a steam can be thought of as a body of text
- sed works by reading text line-by-line into a buffer, and performing some pre-defined instructions (if such instructions are provided).
- Sed helps us automate the same sort of tasks that we'd accomplish manually by opening a textfile and making manual, predictable edits.
- like Vim, if we substitute without the
gflag, then only the first occurrence on the line will substituted. - though
/is the most common delimiter, we can use (almost) anything, like|or:. This is helpful if the/is part of the pattern we want to substitute.
Word-Boundary Expression
- use
\bto disallow partial-word matches- ex. we want to replace
foowithkyle, but want to leavefoobaralone:sed -i '' 's|\bfoo\b|kyle|g file.txt'
- ex. we want to replace
From Formulas
Go to text ā
Find and Replace a pattern in all files of a tree
- find and replace all occurrences of
foowithbarwithin a directory treegrep -rl 'foo' . | xargs sed -i .bk 's|foo|bar|g'- the first part gets a list of all files that have the pattern
fooin it, then it pipes that list into the second part, which runs the sed substitution on each file - if we don't want to create a backup, then replace .bk with ''
Find and Replace a pattern in certain files
- find and replace all occurrences of
foowithbarin all .js filesfind . -name "*.js" -exec sed -i '' s/foo/bar/g {} +
UE Resources
https://www.brianstorti.com/enough-sed-to-be-useful/ https://linuxize.com/post/how-to-use-sed-to-find-and-replace-string-in-files/
Children