Shell Intercept String Instance tutorial

The content of this section:
Shell string Interception method

1, remove the leftmost character of the string

[[Email protected] ~]$ VI test.sh1Str="ABCD"    2str=${str#"a"}    3Echo $STR4str=${str%"D"}                                                                                              5echo $STR Execute script [[email protected]~]$ ./test.sh BCD BC

2, the symbol # indicates the leftmost;% denotes the left and right side; Note the reference to the variable inside the curly brace, preceded by the unsigned $
String interception is not performed if the character string followed by # or% does not match the leftmost or most right value.

[Email protected] ~]$ vi test.sh      1 str="abcd"    2 str=${str#"b"}     3 Echo $STR     4 str=${str%"D"}                                                                                                               5 Echo $STR  

Execute script

[Email protected] ~]$./test.sh   ABCD  ABC  

3, experience the interception of multiple characters, the following script will intercept the leftmost two characters AB

[Email protected] ~]$ vi test.sh        1 str="abcd"    2 str=${str#"ab"  }    3  echo $STR    4 str=${str%"C" }                                                                                                               5 Echo $STR  

Execute script

[[email protected] ~]$./test.sh   CD  

Shell Intercept String Instance tutorial