如何使用 linux shell 脚本更改文件中的单词
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How to change a word in a file with linux shell script
提问by Behnam Safari
I have a text file which have lots of lines I have a line in it which is: MyCar on
我有一个有很多行的文本文件，其中有一行是：MyCar on
how can I turn my car off?
我怎样才能关掉我的车？
采纳答案by knittl
You could use sed:
你可以使用 sed：
sed -i 's/MyCar on/MyCar off/' path/to/file
回答by Balaswamy Vaddeman
回答by technosaurus
You can do this with shell only. This example uses an unnecessary case statement for this particular example, but I included it to show how you could incorporate multiple replacements. Although the code is larger than a sed 1-liner it is typically much faster since it uses only shell builtins (as much as 20x for small files).
您只能使用 shell 执行此操作。这个例子在这个特定的例子中使用了一个不必要的 case 语句，但我包含它是为了展示如何合并多个替换。尽管代码比 sed 1-liner 大，但它通常要快得多，因为它只使用 shell 内置函数（小文件最多可达 20 倍）。
REPLACEOLD="old"
WITHNEW="new"
FILE="tmpfile"
OUTPUT=""
while read LINE || [ "$LINE" ]; do
case "$LINE" in
*${REPLACEOLD}*)OUTPUT="${OUTPUT}${LINE//$REPLACEOLD/$WITHNEW}
";;
*)OUTPUT="${OUTPUT}${LINE}
";;
esac
done < "${FILE}"
printf "${OUTPUT}" > "${FILE}"
for the simple case one could omit the case statement:
对于简单的情况，可以省略 case 语句：
while read LINE || [ "$LINE" ]; do
OUTPUT="${OUTPUT}${LINE//$REPLACEOLD/$WITHNEW}
"; done < "${FILE}"
printf "${OUTPUT}" > "${FILE}"
Note: the ...|| [ "$LINE" ]... bit is to prevent losing the last line of a file that doesn't end in a new line (now you know at least one reasone why your text editor keeps adding those)
注意： ...|| [ "$LINE" ]... 位是为了防止丢失不以新行结尾的文件的最后一行（现在您至少知道一个为什么您的文本编辑器不断添加这些的原因）
回答by user2607061
try this command when inside the file
在文件中尝试此命令
:%s/old test/new text/g
:%s/old test/new text/g
