how to sum variables from file in bash





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2















Hello I need to sum numbers from a file line by line.



The file:



1.0

0.46

0.67


I want to sum, then divide 3.



I currently have:



while IFS= read -r var

do

   x=$(($var + $x)) | bc -l

done < "file.txt"

echo "$x / 3"


My error:



-bash: 1.0 + 0: syntax error: invalid arithmetic operator (error token is ".0 + 0")





bash arithmetic







share|improve this question































    2















    Hello I need to sum numbers from a file line by line.



    The file:



    1.0
    
0.46
    
0.67


    I want to sum, then divide 3.



    I currently have:



    while IFS= read -r var
    
do
    
   x=$(($var + $x)) | bc -l
    
done < "file.txt"
    
echo "$x / 3"


    My error:



    -bash: 1.0 + 0: syntax error: invalid arithmetic operator (error token is ".0 + 0")





    bash arithmetic







    share|improve this question



























      2












      2








      2








      Hello I need to sum numbers from a file line by line.



      The file:



      1.0
      
0.46
      
0.67


      I want to sum, then divide 3.



      I currently have:



      while IFS= read -r var
      
do
      
   x=$(($var + $x)) | bc -l
      
done < "file.txt"
      
echo "$x / 3"


      My error:



      -bash: 1.0 + 0: syntax error: invalid arithmetic operator (error token is ".0 + 0")





      bash arithmetic







      share|improve this question
















      Hello I need to sum numbers from a file line by line.



      The file:



      1.0
      
0.46
      
0.67


      I want to sum, then divide 3.



      I currently have:



      while IFS= read -r var
      
do
      
   x=$(($var + $x)) | bc -l
      
done < "file.txt"
      
echo "$x / 3"


      My error:



      -bash: 1.0 + 0: syntax error: invalid arithmetic operator (error token is ".0 + 0")





      bash arithmetic




      bash arithmetic






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago









      Jesse_b

      14.7k33574




      14.7k33574










      asked 2 hours ago









      AhmetMelihBaşbuğAhmetMelihBaşbuğ

      1225




      1225






















          3 Answers
          3






          active

          oldest

          votes


















          4














          bash/shell arithmetic can't handle floating point arithmetic. You can accomplish your task using awk:



          awk '{sum= sum+$1} END {print sum/3}' file


          This will read through your file and add each line to sum then after it completes reading the file it will print sum divided by 3.






          share|improve this answer































            2














            Just for fun



            $ paste -sd+ file | dc -e2k0 -f- -e+3/p
            
.71





            share|improve this answer































              0














              Try this:



              x=0
              
while IFS= read -r var; do
              
    x="$(echo "$var + $x" | bc -l)"
              
done < "file.txt"
              
echo "$x / 3" | bc -l




              1. x was not defined.

              2. You need an echo for bc to work (not mixed bash arithmetic).






              share|improve this answer
























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                3 Answers
                3






                active

                oldest

                votes








                3 Answers
                3






                active

                oldest

                votes









                active

                oldest

                votes






                active

                oldest

                votes









                4














                bash/shell arithmetic can't handle floating point arithmetic. You can accomplish your task using awk:



                awk '{sum= sum+$1} END {print sum/3}' file


                This will read through your file and add each line to sum then after it completes reading the file it will print sum divided by 3.






                share|improve this answer




























                  4














                  bash/shell arithmetic can't handle floating point arithmetic. You can accomplish your task using awk:



                  awk '{sum= sum+$1} END {print sum/3}' file


                  This will read through your file and add each line to sum then after it completes reading the file it will print sum divided by 3.






                  share|improve this answer


























                    4












                    4








                    4







                    bash/shell arithmetic can't handle floating point arithmetic. You can accomplish your task using awk:



                    awk '{sum= sum+$1} END {print sum/3}' file


                    This will read through your file and add each line to sum then after it completes reading the file it will print sum divided by 3.






                    share|improve this answer













                    bash/shell arithmetic can't handle floating point arithmetic. You can accomplish your task using awk:



                    awk '{sum= sum+$1} END {print sum/3}' file


                    This will read through your file and add each line to sum then after it completes reading the file it will print sum divided by 3.







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 2 hours ago









                    Jesse_bJesse_b

                    14.7k33574




                    14.7k33574

























                        2














                        Just for fun



                        $ paste -sd+ file | dc -e2k0 -f- -e+3/p
                        
.71





                        share|improve this answer




























                          2














                          Just for fun



                          $ paste -sd+ file | dc -e2k0 -f- -e+3/p
                          
.71





                          share|improve this answer


























                            2












                            2








                            2







                            Just for fun



                            $ paste -sd+ file | dc -e2k0 -f- -e+3/p
                            
.71





                            share|improve this answer













                            Just for fun



                            $ paste -sd+ file | dc -e2k0 -f- -e+3/p
                            
.71






                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered 1 hour ago









                            steeldriversteeldriver

                            38.3k45489




                            38.3k45489























                                0














                                Try this:



                                x=0
                                
while IFS= read -r var; do
                                
    x="$(echo "$var + $x" | bc -l)"
                                
done < "file.txt"
                                
echo "$x / 3" | bc -l




                                1. x was not defined.

                                2. You need an echo for bc to work (not mixed bash arithmetic).






                                share|improve this answer




























                                  0














                                  Try this:



                                  x=0
                                  
while IFS= read -r var; do
                                  
    x="$(echo "$var + $x" | bc -l)"
                                  
done < "file.txt"
                                  
echo "$x / 3" | bc -l




                                  1. x was not defined.

                                  2. You need an echo for bc to work (not mixed bash arithmetic).






                                  share|improve this answer


























                                    0












                                    0








                                    0







                                    Try this:



                                    x=0
                                    
while IFS= read -r var; do
                                    
    x="$(echo "$var + $x" | bc -l)"
                                    
done < "file.txt"
                                    
echo "$x / 3" | bc -l




                                    1. x was not defined.

                                    2. You need an echo for bc to work (not mixed bash arithmetic).






                                    share|improve this answer













                                    Try this:



                                    x=0
                                    
while IFS= read -r var; do
                                    
    x="$(echo "$var + $x" | bc -l)"
                                    
done < "file.txt"
                                    
echo "$x / 3" | bc -l




                                    1. x was not defined.

                                    2. You need an echo for bc to work (not mixed bash arithmetic).







                                    share|improve this answer












                                    share|improve this answer



                                    share|improve this answer










                                    answered 2 hours ago









                                    FreddyFreddy

                                    2,241210




                                    2,241210






























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