shell string operation (slice length replacement)

String operation

String slices

The first character of the string, numbered 0, the right character number is increased by 1 at a time

There are two syntaxes for taking string slices

${variable:position starting point}

Start at the specified position, intercept the substring until the end of the string

str="123456"
substr=${str:4}
# Print result is 56echo $substr

${variable:position starting point: length}

str="123456"
substr=${str:2:5}
# Print result is 3456echo $substr

String length

use${#Variable Name}Can calculate the string length of the variable value

name="test"
# 4
echo ${#name}

String replacement

Replace only the first matching string

use${variable/string/replaced with string}To replace the first matching string

str="test..1.."
replace=${str/../-}
# test-1..
echo $replace

Replace all strings that meet the criteria

use${variable//string/replaced with string}To replace all strings that meet the criteria

str="test..1.."
replace=${str//../-}
# test-1-
echo $replace

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