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姚屹晨

Shell - 重定向

2019/12/14

如何将正常结果存入文件中？

  • 覆盖式>
echo "My name is frankie." > name.txt

---------output---------
λ sh redirection.sh
λ cat name.txt
My name is frankie.
  • 追加式>>
echo "l am from Shanghai." >> name.txt

---------output---------
λ sh redirection.sh
λ cat name.txt
My name is frankie.
l am from Shanghai.

更加清晰地理解覆盖式：

echo "Cover all." > name.txt

---------output---------
λ sh redirection.sh
λ cat name.txt
Cover all.

如何将异常结果存入文件中？

  • 若仍使用>，也就是1> (stand output)
// The error is only displayed in the terminal.
echoo "My name is frankie." > error.txt

---------output---------
λ sh redirection.sh
redirection.sh: line 9: echoo: command not found
λ cat error.txt
  • 将错误以覆盖式写入文件
// 2 represents error output.
echoo "My name is frankie." 2> error.txt

---------output---------
λ sh redirection.sh
λ cat error.txt
redirection.sh: line 12: echoo: command not found
  • 将错误以追加式写入文件
echoo "l am from Shanghai." 2>> error.txt

---------output---------
λ sh redirection.sh
λ cat error.txt
redirection.sh: line 12: echoo: command not found
redirection.sh: line 13: echoo: command not found

如何将正常与异常的结果一起存入文件中？

  • 覆盖式
echoo "My name is frankie." &> log.txt

---------output---------
λ sh redirection.sh
λ cat log.txt
redirection.sh: line 16: echoo: command not found

echo "l am from Shanghai." &> log.txt
-------------------------
λ sh redirection.sh
λ cat log.txt
l am from Shanghai.
  • 追加式
echoo "My name is frankie." >> log.txt 2>&1
echo "l am from Shanghai." >> log.txt 2>&1

---------output---------
λ sh redirection.sh
λ cat log.txt
redirection.sh: line 19: echoo: command not found
l am from Shanghai.


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