Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Instrukcja Użytkownika Pobierz pdf (Strona 249)

16.7 Using Redirection 237

Figure 16.11: cat demonstrates standard input and standard output

16.7 Using Redirection

Now that we have a handle on what standard input and standard output are, it’stimetoexpanda

little.

Redirection means causing the shell to change what it considers standard input or where the standard

output is going.

We used cat before to demonstrate the idea behind standard input and standard output. Now, let’s

use cat to see how standard output can be redirected.

To redirect standard output, we’ll use the > symbol. Placing > after the cat command (or after any

utility or application that writes to standard output) will direct its output to the ﬁlename following

the symbol.

Let’stryit.Inanxtermwindowtype:

[billy@localhost billy]$ cat > sneakers.txt

buy some sneakers

then go to the coffee shop

then buy some coffee

Now press

Enter to go to an empty line, and use the Ctrl and D keys to quit cat.

1 2 ... 244 245 246 247 248 249 250 251 252 253 254 ... 299 300

Brak uwag

Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - CUSTOMIZATION Instrukcja Użytkownika Strona 249