Determine string length under Linux

Method 1: Use the wc-l command

Wc-l can get the length of the current row, so the string for a single row can be obtained in this simple way, and the wc-l is the number of rows that get the current string content.

Echo 'abc ' | WC -L

Note: This is the uppercase L

Method 2:expr Length string

Use expr length to get the lengths of a string

Expr ' ABC '

Method 3:awk Gets the number of fields, but if there is a problem when the length is greater than 10 characters, you need to confirm later

Echo ' ABC ' | awk ' {print NF} '

Note: The NF is awk's built-in variable, and-F is the delimiter for the specified string, because ABC has no interval, so the delimiter is '.

Method 4: Get the string length by awk+length

Echo awk ' {print length ($)} '

Note: Awk supports dynamically becoming a language, as long as in block {}, any function and shell syntax can be used to count.

Method 5: Via Echo ${#string} (Note: String here is the variable name of the string)

Name=ABCecho ${#name}

Summarize:

In fact, there are many ways to count strings in the shell, just to see how you can solve the problem.

Reference:

Http://www.jb51.net/article/51348.htm (the above content is transferred from this article)

Determine string length under Linux