3 ms·
$ echo 'foo' > foo $ echo 'bar' > bar $ cat foo bar > foo cat: foo: input file is output file $ cat foo bar vs $ echo 'foo' > foo
by sciurus 12y ago
$ echo 'foo' > foo
$ echo 'bar' > bar
$ cat foo bar > foo
cat: foo: input file is output file
$ cat foo
bar
vs
$ echo 'foo' > foo
$ echo 'bar' > bar
$ cat foo bar | sponge foo
$ cat foo
foo
bar