A simple tool to find and replace substring per line (that are should be way slower than sed), but way simpler to use for simple non-regex use cases.

requires Golang

go install github.com/kokizzu/replacer@latest

• 2021-08-22 first version
• 2023-03-25 add 2 more flag: -untilsubstr and -untilprefix to replace only until specific substring or prefix
• 2023-03-25 3rd parameter became substring search now, previously was prefix search, added 1 new flag: -afterprefix

./replacer [-afterprefix] [-untilsubstr UNTIL_TERM] [-untilprefix UNTIL_TERM] FROM_SUBSTR TO_SUBSTR AFTER_TERM file

Must be in order

• -afterprefix AFTER_TERM will become prefix search instead of default substring search
• -untilsubstr UNTIL_TERM will replace only until UNTIL_TERM substring found
• -untilprefix UNTIL_TERM will replace only until first UNTIL_TERM prefix found

$ echo 'a b c
c d e
afterThisLine
a b c
c d e' > a.txt

$ replacer c ayaya afterThisTerm a.txt
Done 2 replacement

$ cat a.txt
a b c
c d e
afterThisLine
a b ayaya
ayaya d e

//go:generate replacer 'Id" form' 'Id,string" form' 'type Foo int' bla.go
//go:generate replacer -afterprefix 'json:"id"' 'json:id,string" form' type bla.go
//go:generate replacer 'By" form' 'By,string" form' 'type StructX' bla.go