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Top Forums Shell Programming and Scripting floating point shell variable Post 302129768 by jojan on Wednesday 1st of August 2007 02:24:20 PM
Old 08-01-2007
floating point shell variable

I have a two files
>cat file1
jjjjj 10.345 6.673
ppp 9.000 5.883

>cat file2
mmm 80 10
jjjjj 10.305 6.873
ppp 9.000 5.883

I am reading file 1 line by line , and look for the string jjjj and then read the line in file 2 with jjjj
I want to get the flaoting point difference for colum2 and column 3 of file1 and file2, if both has the same column1.

I have the snippet code like this
while read line
do
name=`echo $line | awk ''{ print $1 }`
matchline=`grep -m 1 -e"$name" file2`
f1col2=`echo $line | awk ''{ print $2 }`
f2col2=`echo $matchline | awk ''{ print $2 }`
diffcol2=$(( $f1col2 - $f2col2 ))
echo $diffcol2
done < file1

However I get error at the line diffcol2=$(( $f1col2 - $f2col2 )),
10.345 - 10.305 : syntax error in expression (error token is ".10.345 - 10.305 ")

Do I ahve to do anything special for floating point substarction .
I tried bracing the variable like the following , but still di not work
diffcol2=$(( ${f1col2} - ${f2col2} ))
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
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