Linux String Matching

Source: Internet
Author: User
The beginning and end of a string
% X = aabbaarealwwvvww
% Echo "$ {x % W * w }"
Aabbaarealwwvv
% Echo "$ {x % W * w }"
Aabbaareal
% Echo "$ {X # A * }"
Lwwvvww
% Echo "$ {X # A * }"
Bbaarealwwvvww

Where, # indicates the header, because # on the keyboard is on the left of $.
Here, % indicates the tail, because % on the keyboard is on the right of $.
A single operator represents the minimum matching, and a double operator represents the maximum matching.
That is to say, when there are multiple matching schemes, select the maximum length or the minimum length of the matching.

Example:
Change the extension of all files in a directory to. C:
For I in *; do sudo MV $ I $ {I}. C; done

How to remove. C from the. c file;
For I in *; do sudo MV $ I $ {I %. c}; done

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