##*_ - whats this?

Shell Programming and Scripting
1

Hi all,

could you please tell me whats this stands

##_
0##/

i knew this alone if some more is there please tell me that also.

2

what where you doing to get this output?

3

the below is the statement in my script.

  1. read -r variable < /path/file.txt
    finalvar=${variable##*_}

  2. MYNAME=${0##*/};

please let me know what it is actually doing.

4

They are pattern matching arguments used to strip off certain portions of a string from either the front or end of the string.

Example:

$ >  STRING=this_test_string
$ >  echo ${STRING##*_}
string

$ >  DIR=/home/user1/test
$ > echo ${DIR##*/}
test