what does it mean batch set variable=%variable:~1%

Can anyone explain what is `:~1%` in the below statement in a batch file? I assigned the value of `%variable` to servername and tried `echo %variable`. I get the same server name as output. Can anyone explain how the statement below works?

set variable=%variable:~1%

It's a syntax for substrings from the variable contents, in this case it removes the first character.

See `set /?` for help

this is notation for subs string expansion , look at this out put form command line you will understand.

C:\>set temp=stackoverflow.com

C:\>echo %temp%
stackoverflow.com

C:\>echo %temp:~5%
overflow.com

C:\>echo %temp:~5,8%
overflow

C:\>

if you have not understood , here is syntax (in my words)

set variable=%variable:~startingCharector [,OptionalLenghtOfCharctors]%

where

`OptionalLenghtOfCharctors` by default it takes remaining characters of string.