bash - using command on a gnplot script -

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I am using a script on Mac Bash Shell which uses gnuplot.

When I use <1> ($ 100 *)

on the script <1> (<100>) ) By using the line 

  gets 0: invalid expression   
 However, if I use the same command on the gnuplot prompt line, There is no problem.  
 What is the use of the   command while using it?  
 Thank you for your time.   
 
 
 As you have not posted your script, I can only guess.  
 The problem may be that $ 2 is interpreted as "the second argument of the script" as "bash". You should avoid a dollar sign with backslash.  
 using  1: (\ $ 2 * 100.0)

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