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comp.lang.ruby
Need help in option parser
Kwong Goh
4/11/2008 11:05:00 PM
I am using optionparser to take in arguement. However, it seems like the
option parser does not accept "&" "|" "<" ">" as the arguement when they
are entered from the command line.
For example, I use opts.on("-d option"), when I enter -d 1&2 in the
command line, it will only accept 1 in this case.
May I know what is the reason for this and how to solve this problem?
Thanks.
--
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3 Answers
Tim Hunter
4/11/2008 11:10:00 PM
0
Kwong Goh wrote:
> I am using optionparser to take in arguement. However, it seems like the
> option parser does not accept "&" "|" "<" ">" as the arguement when they
> are entered from the command line.
>
> For example, I use opts.on("-d option"), when I enter -d 1&2 in the
> command line, it will only accept 1 in this case.
>
> May I know what is the reason for this and how to solve this problem?
>
> Thanks.
Depends on what O/S and shell you're using. In most Linux shells those
characters are interpreted by the shell. In Windows both < and > are
interpreted by cmd.com. I don't know about the others.
You can make the shell ignore those characters by surrounding them with
quotes or escaping them with an acceptable escape character such as a
backslash.
--
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http://rmagick.ruby...
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RubyTalk@gmail.com
4/11/2008 11:11:00 PM
0
Try putting 1&2 in quotes "1&2". & | < > are used by the terminal.
Becker
On Fri, Apr 11, 2008 at 4:04 PM, Kwong Goh <kagohaik85@hotmail.com> wrote:
> I am using optionparser to take in arguement. However, it seems like the
> option parser does not accept "&" "|" "<" ">" as the arguement when they
> are entered from the command line.
>
> For example, I use opts.on("-d option"), when I enter -d 1&2 in the
> command line, it will only accept 1 in this case.
>
> May I know what is the reason for this and how to solve this problem?
>
> Thanks.
> --
> Posted via
http://www.ruby-...
.
>
>
Phillip Gawlowski
4/11/2008 11:13:00 PM
0
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Kwong Goh wrote:
| I am using optionparser to take in arguement. However, it seems like the
| option parser does not accept "&" "|" "<" ">" as the arguement when they
| are entered from the command line.
|
| For example, I use opts.on("-d option"), when I enter -d 1&2 in the
| command line, it will only accept 1 in this case.
|
| May I know what is the reason for this and how to solve this problem?
Try to use a 'dir > text.txt', or 'ls > text.txt', or 'dmesg | grep a'
on the command line.
The symbols OptionPArse doesn't accept are reserved by the OS.
(| is the pipe in *NIX, && allows comamnd chaining in Windows and *NIX,
< and > are redirectors, which allow the use of a file as input to a
command, or direct the output of a command to a file, respectively.
There is no way *I* am aware of to circumvent these, except "Stop using
them". Maybe others know more.
- --
Phillip Gawlowski
Twitter: twitter.com/cynicalryan
Make sure all variables are initialised before use.
~ - The Elements of Programming Style (Kernighan & Plaugher)
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