bash 脚本中的换行
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Line breaking in bash script
提问by siemanko
In my company style guide it says that bash scripts cannot be longer than 80 lines. So I have this gigantic sed substitution over twice as long. How can I break it into more lines so that it still works? I have
在我的公司风格指南中，它说 bash 脚本不能超过 80 行。所以我有两倍长的这个巨大的 sed 替代。我怎样才能将它分成更多行以使其仍然有效？我有
sed -i s/AAAAA...AAA/BBBBB...BBB/g
And I want something like
我想要类似的东西
sed -i s/AAAAA...AAA/
BBBBB...BBB/g
still having the same effect.
仍然具有相同的效果。
回答by Swiss
Possible ways to clean up
可能的清理方法
1) Put your sed script into a file
1) 将你的 sed 脚本放入一个文件中
sed -f script [file ...]
2) Use Regex shorthand
2) 使用 Regex 简写
sed 's!A\{30,\}!BBBBB...BBBB!g'
3) Use Bash variables to help break it up a bit
3) 使用 Bash 变量来帮助分解一下
regex="AAAA.AAAAAA"
replace="BBBB...BBBBBBB"
sed "s/${regex}/${replace}/g"
What not to do
什么不该做
1) Escape the newline to break it up into multiple lines.
1）转义换行符以将其分解为多行。
You will end up with a newline in your sed script that you don't want.
您最终会在 sed 脚本中出现一个您不想要的换行符。
sed 's/THIS IS WRONG /\
AND WILL BREAK YOUR SCRIPT/g'
回答by Burhan Khalid
Use the shell continuation character, which is normally \.
使用 shell 继续符，通常是\.
[~]$ foo \
> and \
> bar
Space is not required:
不需要空格：
[~]$ foo\
> and\
> bar\
> zoo\
> no space\
> whee!\
回答by Alexander Putilin
Just insert backslash character before a newline:
只需在换行符之前插入反斜杠字符：
sed -i s/AAAAA...AAA/\
BBBBB...BBB/g
