LẬP TRÌNH SHELL Nội dung Lập trình shell Đặc trưng script Cấu trúc shell-script Create File & Run Script Review commands Parameter & Variables  Parameter   Entity that stores values type  positional parameters    special parameters   arguments present on command line referenced by number set by shell to store info about aspects of current state Variable   identified by a name Contain values Positional Parameters Giá trị default tham số File Name Expansion Options   six shell options that affect way in which file names are expanded shopt command  -s enable  -u disable Ex: various globbing options nullglob failglob dotglob extglob   five new file name expansion operators are added pattern-list is a list of pipe-separated globbing patterns   parentheses, which are preceded by ?, *, +, @, or ! Ex  remove existing files in $HOME/globfest, create a new set Example nocaseglob globstar  allows use of ** to descend recursively into directories &subdirectories looking for matching files review ...Nội dung Lập trình shell Đặc trưng script Cấu trúc shell- script Create File & Run Script Review commands Parameter & Variables... parameters    special parameters   arguments present on command line referenced by number set by shell to store info about aspects of current state Variable   identified by a name Contain values