Bash：替换管道标准输入中的子字符串
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Bash: replacing a substring in pipe stdin
提问by rapt
I try to replace a certain substring from the stdin with a new substring. I have to get the stdin from the pipe, after reading several files by cat. Then I want to push the changed string forward to the pipe.
我尝试用新的子字符串替换 stdin 中的某个子字符串。在通过cat. 然后我想将更改后的字符串向前推到管道中。
Here is what I try to do:
这是我尝试做的：
cat file1 file2 | echo ${#(cat)/@path_to_file/'path//to//file'} | ... | ... | ... | ...
cat file1 file2 | echo ${#(cat)/@path_to_file/'path//to//file'} | ... | ... | ... | ...
I try to replace the substring @path_to_filewith the replacement substring 'path/to/file'(the surrounding quotes are part of the replacement substring).
我尝试用替换子字符串@path_to_file替换子字符串'path/to/file'（周围的引号是替换子字符串的一部分）。
However bash gives me an error message: bad substitution
但是 bash 给了我一条错误消息： bad substitution
Any ideas how I could accomplish this?
任何想法我怎么能做到这一点？
回答by Denis Kohl
You can use the command sed.
您可以使用命令 sed。
cat file1 file2 | sed -e 's/@path_to_file/path/to/file/' ...
回答by Cyrus
With Parameter Expansion:
带参数扩展：
cat file1 file2 | while read -r line; do echo "${line/@path_to_file/path\/to\/file}"; done
