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发表于 2009-7-15 19:52:16
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- $man test
- NAME
- test, [ -- condition evaluation utility
- SYNOPSIS
- test expression
- [ expression ]
- DESCRIPTION
- The test utility evaluates the expression and, if it evaluates to true,
- returns a zero (true) exit status; otherwise it returns 1 (false). If
- there is no expression, test also returns 1 (false).
- ......
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