sed：使用另一个文件的内容修改一个文件
我有一个将 IP 地址写入文件 ip.txt 的脚本，
我想用 ip.txt 中的 IP 替换 html 文件中的 IP 地址。
我有一个与 IP 地址匹配的 sed 正则表达式，我想用 ip.txt 的内容替换这个匹配的文本：
"s/\([0-9] \{1,3\}\.\)\{3\}[0-9]\{1,3\}//g"
我怎样才能让 sed 拉取ip.txt 的内容并放入它在表达式 s/ 中吗？
还有比这更好的方法吗？
sed -e "s/\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}/"`cat ip.txt`"/g"
I've got a script which writes an ip address to a file ip.txt
I want to replace an ip address in an html file with the ip from ip.txt.
I've got a sed regex expression that matches an ip address, and I want to replace this matched text with the contents of ip.txt:
"s/\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}//g"
How can I get sed to pull the contents of ip.txt and put it in the expression s/<search>/<*HERE*>/g?
Is there a better way to do it than this?
sed -e "s/\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}/"`cat ip.txt`"/g"
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没有太大的改进，但您可以替换
为
which 将替换为文件的内容，并且比使用
cat效率稍高。Not much of an improvement, but you can replace
with
which will be replaced with the contents of the file and is slightly more efficient than using
cat.您可以在运行 sed 命令之前将 IP 读入 shell 变量。假设 ip.txt 是仅包含 IP 地址的单行：
You can read the IP into a shell variable before running the sed command. Assuming that ip.txt is a single line containing only the IP address:
POSIX
sed（以及大多数sed的可用实现）支持r file命令在匹配行时读取文件。只要您不介意结果在 IP 地址两侧包含换行符，您就可以使用r轻松完成此操作。描述说：这意味着您没有机会编辑文件的内容，而如果将其读入模式空间或保留空间，则可以修改数据。
在这种情况下，您的命令行替换就已经是您能做的最好的了。
POSIX
sed(and therefore most of the available implementations ofsed) supports ther filecommand to read a file when a line is matched. As long as you don't mind have the result containing newlines either side of where the IP address was, you could easily enough do it usingr. The description says:This means that you don't get a chance to edit the contents of the file, whereas if it was read into the pattern space or hold space, you could could then modify the data.
This being the case, your command line substitution is about as good as you can do.