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lang-c
sometextbecause my file might be pretty big.sometext"? It's inserting text; everything after it will now be a bit later in the file. It might depend on your filesystem, but whatever method you pick, you will probably be rewriting the whole file from that point all the way to the end.sed -iwill just write to a temporary file then, when it's done, move that temporary file over the original. There aren't many ways around this no matter what tool you use.