使用 sed 在 bash for 循环中查找和替换
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using sed to find and replace in bash for loop
提问by James Zaghini
I have a large number of words in a text file to replace.
我在文本文件中有大量要替换的单词。
This script is working up until the sed command where I get:
这个脚本一直运行到我得到的 sed 命令：
sed: 1: "*.js": invalid command code *
sed: 1: "*.js": 命令代码无效 *
PS... Bash isn't one of my strong points - this doesn't need to be pretty or efficient
PS... Bash 不是我的强项之一 - 这不需要漂亮或高效
cd '/Users/xxxxxx/Sites/xxxxxx'
echo `pwd`;
for line in `cat myFile.txt`
do
export IFS=":"
i=0
list=()
for word in $line; do
list[$i]=$word
i=$[i+1]
done
echo ${list[0]}
echo ${list[1]}
sed -i "s/{$list[0]}/{$list[1]}/g" *.js
done
采纳答案by Ignacio Vazquez-Abrams
You're running BSD sed (under OS X), therefore the -iflag requires an argument specifying what you want the suffix to be.
您正在运行 BSD sed（在 OS X 下），因此该-i标志需要一个参数来指定您想要的后缀。
Also, no files match the glob *.js.
此外，没有文件与 glob 匹配*.js。
回答by Johnsyweb
This looks like a simple typo:
这看起来像一个简单的错字：
sed -i "s/{$list[0]}/{$list[1]}/g" *.js
Should be:
应该：
sed -i "s/${list[0]}/${list[1]}/g" *.js
(just like the echolines above)
（就像echo上面的几行一样）
回答by tripleee
So myFile.txtcontains a list of from:to substitutions, and you are looping over each of those. Why don't you create a sedscript from this file instead?
SomyFile.txt包含一个 from:to 替换列表，并且您正在遍历每个替换。为什么不sed从这个文件创建一个脚本呢？
cd '/Users/xxxxxx/Sites/xxxxxx'
sed -e 's/^/s:/' -e 's/$/:/' myFile.txt |
# Output from first sed script is a sed script!
# It contains substitutions like this:
# s:from:to:
# s:other:substitute:
sed -f - -i~ *.js
Your sedmight not like the -f -which means sedshould read its script from standard input. If that is the case, perhaps you can create a temporary script like this instead;
您sed可能不喜欢-f -这意味着sed应该从标准输入读取其脚本。如果是这种情况，也许您可以创建一个这样的临时脚本；
sed -e 's/^/s:/' -e 's/$/:/' myFile.txt >script.sed
sed -f script.sed -i~ *.js
回答by javiunzu
Another approach, if you don't feel very confident with sed and think you are going to forget in a week what the meaning of that voodoo symbols is, could be using IFS in a more efficient way:
另一种方法，如果您对 sed 不是很自信，并认为您会在一周内忘记那个伏都教符号的含义，那么可以以更有效的方式使用 IFS：
IFS=":"
cat myFile.txt | while read PATTERN REPLACEMENT # You feed the while loop with stdout lines and read fields separated by ":"
do
sed -i "s/${PATTERN}/${REPLACEMENT}/g"
done
The only pitfall I can see (it may be more) is that if whether PATTERN or REPLACEMENT contain a slash (/) they are going to destroy your sed expression. You can change the sed separator with a non-printable character and you should be safe. Anyway, if you know whats on your myFile.txt you can just use any.
我能看到的唯一陷阱（可能更多）是，如果 PATTERN 或 REPLACEMENT 包含斜杠 (/)，它们将破坏您的 sed 表达式。您可以使用不可打印的字符更改 sed 分隔符，您应该是安全的。无论如何，如果您知道 myFile.txt 上的内容，则可以使用任何内容。
