Linux 如何计算 Bash 变量中的字符数
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How can I count the number of characters in a Bash variable
提问by lacrosse1991
How can I count all characters in a bash variable? For instance, if I had
如何计算 bash 变量中的所有字符？例如，如果我有
"stackoverflow"
the result should be
结果应该是
"13"
采纳答案by SteveP
Using the ${#VAR}syntax will calculate the number of characters in a variable.
使用${#VAR}语法将计算变量中的字符数。
https://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion
https://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion
回答by aga
${#str_var}
where str_varis your string.
str_var你的字符串在哪里。
回答by Raj
jcomeau@intrepid:~$ mystring="one two three four five"
jcomeau@intrepid:~$ echo "string length: ${#mystring}"
string length: 23
link Couting characters, words, lenght of the words and total lenght in a sentence
回答by mihai
Use the wcutility with the print the byte counts(-c) option:
使用带有打印字节数( ) 选项的wc实用程序：-c
$ SO="stackoverflow"
$ echo -n $SO | wc -c
13
You'll have to use the do not output the trailing newline(-n) option for echo. Otherwise, the newline character will also be counted.
您必须使用不输出尾随换行符( -n) 选项echo。否则，换行符也将被计算在内。
回答by Norbert Wupona
you can use wc to count the number of characters in the file wc -m filename.txt. Hope that help.
您可以使用 wc 来计算文件 wc -m filename.txt 中的字符数。希望有所帮助。
