On 23/02/2016 19:18, Jan Verbeek wrote:
Function definitions that use a bad function name (such as "-" and "=")
are accepted if the function name already exists as an alias. For example:
$ -
dash: 1: -: not found
$ - () { echo hello; }
dash: 2: Syntax error: Bad function name
$ -
dash: 2: -: not found
$ alias -=true
$ -
$ - () { echo hello; }
$ -
hello
$
After alias -=true, - () { echo hello; } is treated as a use of that
alias. It doesn't define a function with a name of -, it defines a
function with a name of true, which consists only of valid characters.
$ alias -=true
$ -() { echo hello; }
$ type -
- is an alias for true
$ type true
true is a shell function
$ true
hello
This matches bash's behaviour, aside from bash requiring -- to prevent
detection of invalid flags to the alias command:
bash-4.3$ alias -- -=true
bash-4.3$ -() { echo hello; }
bash-4.3$ type -
- is aliased to `true'
bash-4.3$ type true
true is a function
true ()
{
echo hello
}
bash-4.3$ true
hello
Cheers,
Harald van Dijk
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