“ | &”在 Bash 中是什么意思？

比如说

echo "aaa" |& cat

|&在这里是什么意思？

有没有推荐的网站来查找这些信息? 因为大多数搜索引擎不支持搜索特殊字符。

bash

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From man 1 bash, section Pipelines:

[time [-p]] [ ! ] command [ [|⎪|&] command2 ... ]

If |& is used, command's standard error, in addition to its standard output, is connected to command2's standard input through the pipe

So it is just like the pipe operator |, but piping both standard output and standard error.

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This operator pipes both standard output and standard error from the left hand side to the right hand side.

The Bash reference manual has a comprehensive index of all operators where you can look up these operators.

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If ‘|&’ is used, command1’s standard error, in addition to its standard output, is connected to command2’s standard input through the pipe; it is shorthand for 2>&1 |. This implicit redirection of the standard error to the standard output is performed after any redirections specified by the command.

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command1 |& command2 equal command1 2>&1 | command2