How to replace a particular string with another in UNIX shell script

Could you please let me know how to replace a particular string present in a text file or ksh file in the server with another string ?
For example :-
I have 10 files present in the path cd /file_sys/file in which i have to replace the word “BILL” to “BILLING” in all the 10 files.

Please help 🙁

Source: shell

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