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I figured out the reason of error. But now I have one more task, now I need to add two text files together and write the output to a new file. I have to add the column4 of file1 to column4 of file2 put the output(all the columns) in a new file. For example: file1: 0 0 200 200 -45.21225200000001...

Hi Bong, Thanks for the reply. When I try your code it gives an error of "invalid command name expr{70-23.119}" and generates an empty file. Do you know why I must be getting this error when I try to execute the "set lst_clmns [lreplace $lst_clmns 4 4 [expr{70-[lindex $lst_clmns 4]" command

Hi All, I am new to tcl/tk programming and need some help on reading and manipulating particular columns in text files. What I need to do is read a text file which has 5 columns of number and add or subtract a user defined number from the last column's value. For example the text file is...