I/O Redirection of NetShell

We use the tool OmniCat to demostrate how the I/O redirection mechanism works. There are 4 ways to set up the (standard) input for the user tools, also 4 ways to set up the (standard) output:

Input
- As above
  By specifying "As above", user can define any files or urls as the input of the tool. The path of the file or the url is given in the entry.
  Example:
  This tool will read the url that's shown in netscape window and write it to the TTY window.
- Program Define
  By specifying "Program Define", user can tell the netshell that the (standard) input has been taken care.
  Example:
```
  Command:	cat < nshconfig
  Input:	(not used)
  Input option:	Program Define
  Output:	(not used)
  Output option:TTY Win
```
  This tool will read the file "nshconfig" from the local file system and write it to the TTY window
- TTY Win
  This option allows user to use the contents in the TTY window as input. Details about this option is here .
- Current URL
  The netshell will redirect the content of current url as the standard input to the tool.
  Example:
```
  Command:	cat
  Input:	(not used)
  Input option:	Current URL
  Output:	(not used)
  Output option:TTY Win
```
  This tool will do same thing as the example for "As above" as input.
Output
- As above
  Netshell will redirect the output of the tool to the user defined file.
  Example:
```
  Command:	cat
  Input:	(not used)
  Input option:	TTY Win
  Output:	$TMPDIR/outputs
  Output option:As above
```
  This tool will read in all the selected segments and write them to $TMPDIR/outputs. ($TMPDIR is a predefined variable.)
- Program Define
  User tell netshell not to touch the output of the tool.
  Example:
```
  Command:	cat
  Input:	(not used)
  Input option:	TTY Win
  Output:	
  Output option:Program Define
```
  The output will be sent to the Shell from which the netshell is launched.
- TTY Win
  The output will be sent to the TTY window and can be used as input laterly.
- Browser
  The output will be shown in the Netscape window
  Example:
```
  Command:	cat
  Input:	(not used)
  Input option:	Current URL
  Output:	
  Output option:Browser
```
  The tool will get the url that's shown in netscape window and then show it in the netscape window again as a temporary file.

I/O Redirection of NetShell

Input

Output