writes stdin to a file, while also printing a diff
# tired, dusty
echo "abc" > results.txt
# (no output)
# amazing, really good
echo "def" | diffwrite results.txt
# --- a/results.txt
# +++ b/results.txt
# @@ -1,1 +1,1 @@
# -abc
# +def| redirection | diffwrite |
|---|---|
| prints nothing, how unixy | prints a diff |
| streams, wow, unix philosophy | reads the whole thing into memory |
| cant even pipe a file into itself | like a snake eating its tail |
| posix | live a little |