bash bash的字符串长度
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String length of bash
提问by user2443218
I have written this to find the length of the string, but it doesn't show the length of the string.
我写这个是为了找到字符串的长度，但它没有显示字符串的长度。
Is there something wrong with what I have written? I'm just a beginner in bash.
我写的有什么问题吗？我只是 bash 的初学者。
Str=abcdefghj
echo "Str is:" `expr length $Str` "characters long"
回答by iruvar
This can be done natively in bash, no need to resort to expr
这可以在 bash 中本地完成，无需求助于 expr
echo ${#Str}
回答by Mukesh Shakya
Here is couple of ways to calculate length of variable :
这里有几种计算变量长度的方法：
echo ${#Str}
echo -n $Str | wc -m
echo -n $Str | wc -c
printf $Str | wc -m
expr length $Str
expr $Str : '.*'
Reference: http://techopsbook.blogspot.in/2017/09/how-to-find-length-of-string-variable.html
参考：http: //techopsbook.blogspot.in/2017/09/how-to-find-length-of-string-variable.html
回答by Angel García
: Try something like this,
: 试试这样的，
echo "Str is: expr length $Strcharacters long"
echo "Str 是：expr length $Str字符长"
