使用sed中的美元符号进行变量替换和字符转换 [英] Using dollar sign in sed for both variable replacement and character

问题描述

我尝试使用sed更改名为convergence.gnu的文件中的行 我有一个名为lafila的变量，它是一个文件名

I try to use sed to change a line in a file named convergence.gnu I have a variable named lafila, which is a file name

目前，我可以这样做:

lafila="nGas060.dat"
sed -i "6s/.*/plot \"$lafila\" using 1:2 with l/" convergence.gnu

这可以将我的convergence.gnu文件的第六行正确更改为:

This changes correctly the sixth line of my convergence.gnu file to:

plot "nGas062.dat" using 1:2 with l

但是，现在我想在替换的行中包含一个美元符号来代替:

However, now I want to include a dollar sign in the replaced line to obtain instead:

plot "nGas062.dat" using ($1/1000):2 with l

您能告诉我sed命令中要进行哪些更改吗?如果我逃脱了一个美元符号，它将无法正常工作.双倍的美元也不起作用.

Can you tell me what to change in my sed command? If I escape a dollar sign it does not work properly. Double dollars also don't work.

推荐答案

使用单引号:

sed -i '6s/.*/plot "'$lafila'" using ($1\/1000):2 with l/' convergence.gnu

单引号保护双引号，并且$在其内部不解释.但是，您确实需要转义/.

Single quotes protect double quotes and $ is not interpreted inside them. However, you do need to escape /.

另请参阅:

• Bash中单引号和双引号之间的区别

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