代码： 全选
if ! [[ $1 =~ .mp3$ ]]; then exit 1; fi
if [[ $(tty) =~ /dev/tty.+ ]]; then代码： 全选
05/10/2009 15:01:11
tusooa (~)
>> type [
[ is a shell builtin
05/10/2009 15:01:35
tusooa (~)
>> type [[
[[ is a shell keyword
05/10/2009 15:01:37
tusooa (~)
>> [ h
bash: [: missing `]'
05/10/2009 15:01:42
tusooa (~)
>> [[ h
bash: unexpected token `newline', conditional binary operator expected
bash: syntax error near `h'
05/10/2009 15:01:44
tusooa (~)
>> [[ --help = -* ]]
05/10/2009 15:01:51
tusooa (~)
>> echo $?
0
05/10/2009 15:01:57
tusooa (~)
>> [ --help = -* ]
05/10/2009 15:02:02
tusooa (~)
>> echo $?
1