">" used in system() is not printing into file

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# 1  
Old 09-17-2009
">" used in system() is not printing into file

I have a problem with the following skript in awk.

cat runde.txt |awk '{
                               if ($5==2) {
                                                   dataname_v=$1 "_" $4 "_adjust.rad
                                                   befehl1="gensurf seitenwand rollerblind1 '-0.95*s' '0.046' '2.85-$7*t' 1 1 > dataname_v"

It is supposed to create in Radiance a surface with different parameters and then print it into the next course $1 "_" $4 "_adjust.rad-file automaticly. (It is getting $1, $4 and $7 from runde.txt, that is just a table-file with numbers).

The problem is that on one side it is performing the gensurf-command, but still it is just printing out the result on screen and it is also creating the files automatically with the right name, but they are empty.

Does anyone has an idea how to solve it? Maybe connecting strings? I have no idea.

Thanks a lot,

Last edited by ergy1983; 09-20-2009 at 01:23 PM..
# 2  
Old 09-18-2009
Originally Posted by ergy1983
Does anyone has an idea how to solve it? Maybe connecting strings?
A couple of trivial things to take care of -

cat runde.txt | awk '{ if ($5==2) {
                         befeh="gensurf seitenwand rollerblind1 '-0.95*s' '0.046' '2.85-$7*t' 1 1 > "dataname_v

# 3  
Old 09-18-2009
but this isn't working as well.

I tried a lot of things. Your version is just outputting the following error:

> ^ unexpected character

befehl1="gensurf seitenwand rollerblind1 '-0.95*s' '0.046' '2.85-$7*t' 1 1 > dataname_v"

> ^ unexpected character

befehl1="gensurf seitenwand rollerblind1 '-0.95*s' '0.046' '2.85-$7*t' 1 1" ">" dataname_v

Usage: c:\Daysim\bin_windows\gensurf.exe material name x(s,t) y(s,t) z(s,t) m n [-s][-e expr][-f file]

befehl1="gensurf seitenwand rollerblind1 '-0.95*s' '0.046' '2.85-'" $7 "'*t' 1 1 >" dataname_v

Is just printing "# c:\Daysim\bin_windows\gensurf.exe seitenwand rollerblind1 -0.95*s 0.046 2.85-0*t 1 1" into the files

But none of this is performing the command and printing the result into the files.

Last edited by ergy1983; 09-19-2009 at 03:51 PM..
# 4  
Old 09-19-2009
Please, is there anyone who has an idea, how to solve this. Mabe I am just blind for it...
# 5  
Old 09-19-2009
Try to escape the meta characters:

befehl="gensurf seitenwand rollerblind1 '\''-0.95\\*s'\'' '\''0.046'\'' '\''2.85-\\$7\\*t'\'' 1 1 \\> "dataname_v

# 6  
Old 09-20-2009
Thanks a lot for your answer Franklin52. That is exactly what I was searching for. Unfortunately it is still not working. Is it maybe possible to explain how '/' and // ar working? I cannot find anythin in my books or internet for escaping metacharacters in shell. I just found something about execve(), but this is not defined on my system.

Secondly I tried already something with &, / and +, but I didn't get anywhere. I know that this is very special. I just want to automate my evaluation and am actually dying at this point.

Again thanks for your answer,

Last edited by ergy1983; 09-20-2009 at 01:21 PM..
# 7  
Old 09-21-2009
Note that a backslash \ is used to escape the characters, not a slash /.

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