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Suppose that instead of displaying a list of files on the screen, you would like to save this list in a file. In other words, you would like to direct the standard output to a file rather than the screen. To do this, you place the output redirection operator, > (greater-than sign), and the name of a file on the command line after the Linux command. Table 11-2 lists the different ways you can use the redirection operators. In the next example, the output of the cat command is redirected from the screen device to a file: Table 11-2: The Shell Operations
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Execution Execute a command line. Separate commands on the same command line. Enter backslash before carriage return to continue entering a command on the next line. Execute a command. Erase the previous character. Erase the command line and start over. Interrupt and stop a command execution.
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Special Characters for Filename Generation Execution * [] \ Redirection command filename command filename command filename command ! filename Match on any set of characters. Match on any single characters. Match on a class of possible characters. Quote the following character. Used to quote special characters. Execution Redirect the standard output to a file or device, creating the file if it does not exist and overwriting the file if it does exist. Redirect the standard input from a file or device to a program. Redirect the standard output to a file or device, appending the output to the end of the file. In the C shell and the Korn shell, the exclamation point forces the overwriting of a file if it already exits. This overrides the noclobber option. Redirect the standard error to a file or device in the Bourne shell. Redirect and append the standard error to a file or device in the Bourne shell. Redirect the standard error to the standard output in the Bourne shell. Redirect the standard error to a file or device in the C shell. Execution Pipe the standard output of one command as input for another command. Pipe the standard error as input to another command in the C shell. Execution Execute a command in the background. Bring a command in the background to the foreground or resume an interrupted program.
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Table 11-2: The Shell Operations Execution Place a command in the foreground into the background. Interrupt and stop the currently running program. The program remains stopped and waiting in the background for you to resume it. Notify you when a job ends. Cancel and end a job running in the background. List all background jobs. The jobs command is not available in the Bourne shell, unless it is using the jsh shell. List all currently running processes including background jobs. Execute commands at a specified time and date. The time can be entered with hours and minutes and qualified as A.M. or P.M.
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$ cat myletter > newletter
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The redirection operation creates the new destination file. If the file already exists, it will be overwritten with the data in the standard output. You can set the noclobber feature to prevent overwriting an existing file with the redirection operation. In this case, the redirection operation on an existing file will fail. You can overcome the noclobber feature by placing an exclamation point after the redirection operator. You can place the noclobber command in a shell configuration file to make it an automatic default operation (see 13). The next example sets the noclobber feature for the BASH shell and then forces the overwriting of the oldletter file if it already exists:
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