string of Shell intercept variable

From: http://blog.sina.com.cn/s/blog_7c95e5850100zpch.html

Suppose there is a variable var=http://www.linuxidc.com/test.htm a # Intercept, delete the left character, and leave the right character. echo ${var#*//} where  var  is the variable name,#  number is the operator,*//  means delete the first  //  and all characters to the left from the left to delete   http://result is  :www.linuxidc.com/test.htm  two  ##  intercept, delete left character, retain right character. echo ${var##*/}##*/  means delete the last (rightmost)  /  and all characters on the left, starting from the left  http://www.linuxidc.com/           result is  test.htm three  %, delete the right character, leave the left character echo ${var%/* }%/*  means starting from the right, deleting the first  /  and right character result is: http://www.linuxidc.com four  %%  intercept, delete the right character, leave the left character Echo  ${var%%/*}%%/*  to start from the right, delete the last (leftmost) one  /  and right character result is: http: Five   start with the first character on the left and the number of characters echo ${ Var:0:5} where the  0  represents the first character on the left,,5  represents the total number of characters. The result is: http: Six   starting from the first few characters on the left, until the end. Echo ${var:7} where  7  represents the 8th character on the left, starting at the end. The result is  :www.linuxidc.com/test.htm seven   starting with the first character on the right and the number of characters Echo ${var:0-7:3} where  0-7  Represents the number of characters from the right side, starting with the seventh character,3 . The result is: Test eight   start from the first character on the right, until the end. Echo ${var:0-7} means starting from the seventh character on the right until the end. The result is: test.htm Note: (The first character on the left is denoted by  0 , rightThe first character of the edge is represented by  0-1 ) This article originates from the  linux commune website (www.linuxidc.com)    original link: http://www.linuxidc.com/ Linux/2010-12/30625.htm

String of Shell intercept variable (GO)