Comparing two files

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# 8  
Old 08-14-2013
that helped thanks

---------- Post updated at 12:25 PM ---------- Previous update was at 12:20 PM ----------

However ,
what if I want to retrieve each of the lines and put all the values in them in an associative array ?
"K","","1303","A  ","",0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1800,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

0 .. etc

---------- Post updated at 12:26 PM ---------- Previous update was at 12:25 PM ----------

how to write a snippet for that ?


Last edited by Scott; 08-14-2013 at 10:23 AM.. Reason: Please use code tags
# 9  
Old 08-14-2013
Do you want to print the exact difference? or the lines that are different?
# 10  
Old 08-14-2013
the difference as well
# 11  
Old 08-14-2013
The below will tell you if the files are different or not
cmp -s file1.txt file2.txt; echo $? | xargs -I var bash -c 'if [ var -gt 0 ];then echo "Files are different"; else echo "Files are the same";fi'

Computing the difference using only shell needs a little work. I think in going trough the files and compare lines from one file with the corresponding lines from the other.

And where you encounter differences to echo with different color or smth...but as i said i think this needs a little work...

---------- Post updated at 09:39 AM ---------- Previous update was at 07:11 AM ----------

I came up with the following script :
#Date : 14.08.2013
#Author : Ionut Capitanu
#Purpose : Verify if 2 CSV files are different and show line by line differences
#Usage : ./ <file1> <file2>

#Verify positional params
if [ $# -lt 2 ]; then
        echo "Not enough parameters, 2 files needed for comparison"
        echo "Usage : ./ <file1> <file2>"
        exit 1

#Get file names

#Verify that the files exist
if [[ ! -e $FILE1 ]]; then
        echo "File `pwd`/$FILE1 does not exist"
        exit 1

if [[ ! -e $FILE2 ]]; then
        echo "File `pwd`/$FILE2 does not exist"
        exit 1


#Verify if files are different
DIFF=`cmp -s $FILE1 $FILE2; echo $?`

if [[ "$DIFF" = 0 ]]; then
                echo "Files are not different. No need for comparison"
                exit 1
          #Loop through files and compare fields
          NRLINES_F1=`wc -l $FILE1 | cut -d" " -f1`
          NRLINES_F2=`wc -l $FILE2 | cut -d" " -f1`

          if [ $NRLINES_F1 -gt $NRLINES_F2 ]; then

              for (( j=1;j<=MAXLINE;j++ ));  do
              if [[ `awk -F, -v j="$j" 'FNR == j {print $0}' $FILE1` != `awk -F, -v j="$j" 'FNR == j {print $0}' $FILE2` ]];then
                   #Find maximum number of fields between lines j of both files
                    if [[ `awk -F, -v j="$j" 'FNR == j {print NF}' $FILE1` -lt `awk -F, -v j="$j" 'FNR == j {print NF}' $FILE2` ]]; then
                            MAX=`awk -F, -v j="$j" 'FNR == j {print NF}' $FILE2`
                            MAX=`awk -F, -v j="$j" 'FNR == j {print NF}' $FILE1`

                    #Echo line j from FILE1
                    echo `pwd`"/$FILE1,Line$j:" #>> result.file
                    awk -v j="$j" 'FNR == j {print $0}' $FILE1 #>> result.file

                    #Echo header for line j from FILE2
                    echo `pwd`"/$FILE2,Line$j:" #>> result.file

                    #Compute differences
                    for (( i=1;i<=MAX;i++ ));  do

                    #Echo line from FILE2 with different fields in red
               if [ "`awk -F, -v i="$i" -v j="$j" 'FNR == j {print $i}' $FILE1`" == "`awk -F, -v i="$i" -v j="$j" 'FNR == j {print $i}' $FILE2`" ]
                             echo -n `awk -F, -v i="$i" -v j="$j" 'FNR == j {print $i}' $FILE1`"," #>>result.file
                             echo -n -e "${red}`awk -F, -v i="$i" -v j="$j" 'FNR == j {print $i}' $FILE2`","${NC}" #>> result.file
                  echo -e "\n"


Hope this helps you. Feel free to modify it, modularize it maybe with functions or something, bring in some more logic to it, etc.

Test files :
1,2,3,4,5,6,7,8,9,"G",F, T, D

T,2,3,4,0,6,7,8,ABC,"G",z, T, D,10,12

1,2,3,4,5,6,7,8,9,"G",F, T, D




The differences will be outlined in red.

EDIT : I modified it a little bit to output only different lines

Last edited by capitanui; 08-14-2013 at 12:57 PM.. Reason: Please use code tags
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