That doesn't work for me (in Fish). > cat foo echo wat > ./foo Failed to execute process './foo'. Reason: exec: Exec format error The file './foo'

That doesn't work for me (in Fish). > cat foo echo wat > ./foo Failed to execute process './foo'. Reason: exec: Exec format error The file './foo' is marked as an executable but could not be run by the operating system. It does however work in Bash. So this appears to be a bash-ism, rather than an OS feature.