How to use angle brackets in the command line argu

问题:

How to use an angle brackets in command line arguments?

Suppose the input is: filename -w <input.txt>

Here input.txt is a second command line argument, and it is an input file to a program here input.txt must be enclosed by angle brackets( <input.txt> ) . But if I use angular brackets i m getting error. error is :

sh: -c: line 0: syntax error near unexpected token `newline'
sh: -c: line 0: `demo -w '

回答1:

Your question is not very clear. However, it seems to me a shell problem, not a Tcl one.

I suppose your filename is the name of a Tcl executable script and you want to give it input.txt as parameter.

But the angle brackets have special meaning to the shell. sh interprets the < as standard input redirecting, so it reads the content of input.txt and passes it to filename through the standard input channel.

Then, sh interprets the > as standard output redirecting, but after that there is no name to redirect the output to, so it gives you the error you see, because after > you pressed the Return key.

So, are you sure your script needs the filename surrounded by angle brackets? If so, escape the brackets, like

filename -w \<input.txt\>

Otherwise, try to completely remove the brackets and use

filename -w input.txt

I hope this helps.