通过外壳脚本在字符串中转义美元符号 [英] Escape dollar sign in string by shell script

问题描述

假设我有一个名为dd.sh的脚本，并且我这样运行它

Suppose I have a script named dd.sh, and I run it like this

./dd.sh sample$name.mp4

所以$1是字符串sample$name.mp4.

echo '$1' // shows $1

echo "$1" // shows sample.mp4

然后如何处理$1，我可以检测到参数$1

Then how to process $1 that I can detect whether there is a dollar sign in parameter $1

我想将字符串处理为sample\$name.mp4，或者只是检测参数$filename中是否有美元符号

I want to process the string to sample\$name.mp4 or just detect whether there is a dollar sign in parameter $filename

推荐答案

如您所知，美元符号表示变量.键入时必须考虑到它.

As you know, a dollar sign marks a variable. You have to take it into account when you are typing it.

您可以逃脱美元

./dd.sh "sample\$name.mp4"

或仅用单引号将其输入

./dd.sh 'sample$name.mp4'

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要检查变量中是否有美元符号，请执行

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To check if there is a dollar sign in a variable, do

[[ $variable == *\$* ]] && echo 'I HAZ A DOLAR!!!' || echo 'MEH'

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