Replacing variables in bash Programming

$ {Var # * word}: it refers to the separator where word is $ var. From left to right, after finding the separator that matches for the first time, remove all characters on the left of the separator (including the separator ).

 

$ {Var ## * word}: The separator with the word as $ var. From left to right, find the last matched separator and remove the separator (including the separator) all characters on the left

 

$ {Var % word *}: The separator with the word as $ var. from the right to the left, after finding the separator for the first match, remove all characters on the right of the separator (including the separator ).

 

$ {Var % word *}: Specifies the separator where word is $ var. from right to left, after finding the last matched separator, remove the separator (including the separator) all characters on the right

 

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