">>" sẽ thêm data vao file">" xoa nd file cu và chep nội dung mới vàoVD#!/bin/bashecho "tao file kevin.txt"echo "kevin kien">kevin.txtecho "xong"echo "hoc vien ky thuat mat ma">>kevin.txtcat kevin.txtecho "an toan thong tin">kevin.txtecho "dung"
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