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Beginning Red Hat Linux 9 phần 5

Như bạn có thể nhìn thấy từ ảnh chụp màn hình ở trên, có bốn loại đối tượng được hỗ trợ, bao gồm cả Microsoft Word (WinWord ), Microsoft Excel, Microsoft PowerPoint, và MathType. Lưu ý MathType là một ứng dụng được sử dụng để đại diện cho công thức toán học. | Auto-completion We can also use the exclamation mark . When we apply to an expression it indicates that we are looking for the complement of the expression match resulting from the parentheses metacharacters that is all results except those that match the expression . Try it Out File Globbing Perhaps the easiest way to understand the type of things that file globbing allows us to do is to look at an example. So in this example we ll create a number of files and then use different globbing expressions to select different subsets of the files for listing. 1. Create a temporary folder called numberfiles and then set it to be the current working directory mkdir home usemame numberfiles cd home usemame numberfiles 2. Now create ten files named after the Italian words for the numbers 1 to 10. Use the touch command to do this touch uno due tre quattro cinque sei sette otto nove dieci Use the ls command just to list them all by default it lists them by name in alphabetical order ls cinque dieci due nove otto quattro sei sette tre uno 3. Now let s group them in a number of different ways using the metacharacters we just mentioned. First list all the files that start with the letter s ls s sei sette 4. Next use the metacharacter to select all files whose name consists of exactly three characters ls due sei tre uno 5. Next select all the files whose name starts with a vowel ls aeiou otto uno 6. Next select all the files whose name starts with any character in the range a to f ls a-f cinque dieci due 7. Finally select all the files whose name does not start with a vowel. The exclamation operator must be within the square parentheses. ls aeiou cinque dieci due nove quattro sei sette tre How it Works_ We ve used the ls command here to demonstrate file globbing because the output from ls shows the effects of the globbing very clearly. However you should note that we can use file globbing with any .