That is called a sponge! SPONGE(1) moreutils SPONGE(1) NAME sponge - soak up standard input and

That is called a sponge! SPONGE(1) moreutils SPONGE(1) NAME sponge - soak up standard input and write to a file SYNOPSIS sed '...' file | grep '...' | sponge [-a] file DESCRIPTION sponge reads standard input and writes it out to the specified file. Unlike a shell redirect, sponge soaks up all its input before writing the output file. This allows constructing pipelines that read from and write to the same file.