1
Download Learning the bash Shell, 3rd Edition
Transcript
Redirector Function closed. If n is not specified, the standard input (file descriptor 0) is used. n>&digit- Moves the file descriptor digit to file descriptor n, or the standard output (file descriptor 1) if n is not specified. n<&digit- Moves the file descriptor digit to file descriptor n, or the standard input (file descriptor 0) if n is not specified. digit is closed after being duplicated to n. Notice that some of the redirectors in Table 7-1 contain a digit n, and that their descriptions contain the term file descriptor; we'll cover that in a little while. The first two new redirectors, >> and >|, are simple variations on the standard output redirector >. The >> appends to the output file (instead of overwriting it) if it already exists; otherwise it acts exactly like >. A common use of >> is for adding a line to an initialization file (such as .bashrc or .mailrc) when you don't want to bother with a text editor. For example: 432
