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注意 >/dev/null 和 2>&1 的顺序问题
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| #!/bin/bash | |
| >&2 echo 'stderr' | |
| echo 'stdout' |
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| #!/bin/bash | |
| ./1.sh 2>&1 >/dev/null | |
| ./1.sh >/dev/null 2>&1 |
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