http://osfree.su/doku/ 2026-04-04T09:24:23+00:00 http://osfree.su/doku/ http://osfree.su/doku/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2014-05-24T06:54:46+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:cond&rev=1400914486&do=diff Conditional Commands When an internal command or external program finished, it returns a result called the exit code. Conditional commands allow you to perform tasks based upon the previous command's exit code. Many programs return a 0 if they are successful and a non-zero value if they encounter an error. text/html 2014-05-24T06:08:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:criterr&rev=1400911710&do=diff Critical Errors OS/2 watches for physical errors during input and output operations. Physical errors are those due to hardware problems, such as trying to read a floppy disk while the drive door is open. These errors are called critical errors because text/html 2014-05-24T06:53:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:escape&rev=1400914418&do=diff Escape Character CMD.EXE recognizes a user-definable escape character. This character gives the following character a special meaning; it is not the same as the ASCII ESC that is often used in ANSI and printer control sequences. The default escape character is a caret [^]. text/html 2014-05-24T06:56:21+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:grouping&rev=1400914581&do=diff Command Grouping Command grouping allows you to logically group a set of commands together by enclosing them in parentheses. The parentheses are similar in function to the BEGIN and END block statements in some programming languages. There are two primary uses for command grouping. One is to execute multiple commands in a place where normally only a single command is allowed. For example, suppose you want to execute two different text/html 2014-05-24T06:57:11+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:keystack&rev=1400914631&do=diff Using the Keystack The Keystack overcomes two weaknesses of input redirection: some programs ignore standard input and read the keyboard directly, and input redirection doesn't end until the program or command terminates. You can't, for example, use redirection to send the opening commands to a program and then type the rest of the commands yourself. But the Keystack lets you do exactly that. text/html 2014-05-24T05:13:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:prompts&rev=1400908425&do=diff Page and File Prompts Several CMD.EXE commands can generate prompts, which wait for you to press a key to view a new page or to perform a file activity. When CMD.EXE is displaying information in page mode, for example with a DIR /P or SET /P command, it displays the message text/html 2014-06-24T21:09:08+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:redir&rev=1403644148&do=diff Redirection and Piping This section covers redirection and piping. You can use these features to change how CMD.EXE and some application programs handle input and output. Internal commands and many external programs get their input from the computer's text/html 2014-05-24T06:04:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://osfree.su/doku/doku.php?id=en:ibm:cmd:other:waiting&rev=1400911473&do=diff Waiting for Application to finish When you start an OS/2 Presentation Manager application from the prompt, the command processor does not normally wait for the application to finish before returning to the prompt. This default behavior allows you to continue your work at the prompt while the application is running. You can force