Why is stdin always a pipe?

[João Eiras]

>> $ [[ -p /dev/stdin ]] && echo pipe || echo nopipe
>> nopipe

Interesting, it's always a pipe for me. What about ls ?

$ ls -l /dev/stdin
prw------- 1 user None 0 Jun  4 15:54 /dev/stdin

>> $ [[ -t /dev/stdin ]] && echo term || echo noterm
>> noterm

The '-t' operator is used with file descriptors, so "[[ -t 0 ]]"
http://tldp.org/LDP/abs/html/fto.html

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