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This article mainly introduces how to operate the string under Linux. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

String interception

Define string

$str=www.baidu.com matches string interception

#: truncate left to right, cut to match for the first time, and the output result is baidu.com

$echo ${str#*.}

# #: truncate left and right to the last match, and the output result is com

$echo ${str##*.}

%: truncate the right and truncate the left to the first match, and the output result is www.baidu

$echo ${str%.*}

%%: truncate right, take left, truncate to the last match, and the output is www.

$echo ${str%%.*} matching length truncation

Starting with the 0 position character, the string with length 2 is intercepted, and the output is ww.

$echo ${str:0:2}

The output is ww.baidu.com, starting with the character at position 1 and ending with the character.

$echo ${str:1}

Starting from the penultimate character, intercept a string with a length of 2, and the output is co

$echo {str:0-3:2}

From the penultimate character to the end, the output is om

$echo ${str:0-2}

The above is all the contents of the article "how to operate strings under Linux". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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