Inserting variable value into filename

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# 1  
Old 08-24-2009
Inserting variable value into filename

Greetings, people of UNIX/Linux forums.

I am having a problem with a script, where I am trying to create a new variable. The value of this variable would be dependent on the value in a couple other previous variables (all variables are 2-digit integers). Here is my code:

#set the stations
set stn = `cat wind_obs_${date}.dat | cut -c 3-7`
set mth = `cat wind_obs_${date}.dat | cut -c 10-11`
set day = `cat wind_obs_${date}.dat | cut -c 13-14`
set hr = `cat wind_obs_${date}.dat | cut -c 18-19`
set lat = `cat wind_obs_${date}.dat | cut -c 34-38`
set lon = `cat wind_obs_${date}.dat | cut -c 25-30`
set nlines = `cat -b wind_obs_${date}.dat | tail -1 | cut -c 4-7`
# all variables above are being set fine

if (whichruc == 1) then
setenv RUCDATA /ldm_data/gempak/rtma/ruc_oper
set infile = ruc5_oper.2008${mth}${day}${hr}.gem #problem line
setenv RUCDATA /ldm_data/gempak/rtma/ruc
set infile = ruc5_back.2008${mth}${day}${hr}.gem #problem line

When I run this, I get an error saying:
set: Variable name must begin with a letter.

My variable name does begin with a letter and I cannot find a way for this to work. What should I do to ensure the value of the variables go into the file name?

Thank you!
# 2  
Old 08-24-2009
Simplify it - test the lines below and see how the script behaves


# 3  
Old 08-24-2009
Didn't work. Same error.

I have investigated further and now think that the mth, day and hr variables are actually arrays, as they were formed by cutting/counting characters from a multi-line dat file.

Any other ideas appreciated!
# 4  
Old 08-24-2009
you need to "grep" the specific line here "wind_obs_${date}.dat". so the variable assignment would not be a multiline one
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