case () in 1)cat $1;; 2)cat>>$2<$1;; *)echo 'defult...';; esac
$#
$@
$$
$*
#!/bin/sh case $# in 1) echo $1;; 2) echo $1 $2;; *) echo 'default...';; esac 分号呢????,最后一行应该是esac
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