Title: Theory / Unimportant / CS / command line / pipe tools / sponge

Instruction: sponge
Page: https://linux.die.net/man/1/sponge
Context: command line
Returns: wait until the end of input, then output all to the standard output

Instruction: sponge foo
Page: https://linux.die.net/man/1/sponge
Effect: wait until the end of input, then output all to the standard foo
Context: command line
Intuition: Allow to use same file as input and output