Bash script for basic mathematic operations

Question

I am new to Linux, and I just want a Bash Script to do basic arithmetic operation to a text file

and the results should be addition and multiplication in separate text files

say add + 5 for 1st text file and mult * 5 in 2nd text file

add:                             mult: 
6                                5
7                                10
8                                15
9                                20

Have you attempted anything here? See mywiki.wooledge.org/BashFAQ/001 for how to properly and safely read lines from a file in bash/the shell. Though you could also do what you want with awk or perl or similar instead of the shell. — Etan Reisner
– Etan Reisner, Commented Jun 17, 2015 at 14:50

chepner · Accepted Answer · 2015-06-17 14:51:40Z

4

This reads each number from the input file, and outputs the correctly modified output to each output file.

while IFS='' read -r number; do
    printf "%d\n" $((number + 5)) >&3
    printf "%d\n" $((number * 5)) >&4
done < input.txt 3> first.txt 4> second.txt

answered Jun 17, 2015 at 14:51

chepner

538k77 gold badges594 silver badges746 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Pablo Francisco Pérez Hidalgo · Accepted Answer · 2015-06-17 14:55:54Z

2

You can try awk.

 awk '{print $1,  $1*5}' file.txt

Will print the results in the standard output which you can redirect to a file.

An easy way to separate the results:

 awk '{print $1+5 > "add.txt";  print $1*5 > "mul.txt"}' file.txt

edited Jun 17, 2015 at 14:55

answered Jun 17, 2015 at 14:51

Pablo Francisco Pérez Hidalgo

27.8k8 gold badges39 silver badges64 bronze badges

2 Comments

willeM_ Van Onsem Over a year ago

The OP asks to do these in separate files.

Pablo Francisco Pérez Hidalgo Over a year ago

@CommuSoft You are right! I added that to my answer.

Eugeniu Rosca · Accepted Answer · 2015-06-17 15:19:26Z

0

while IFS= read -r num; do echo "$((num+5))" ; done < filename
while IFS= read -r num; do echo "$((num*5))" ; done < filename

edited Jun 17, 2015 at 15:19

answered Jun 17, 2015 at 14:49

Eugeniu Rosca

5,37519 silver badges48 bronze badges

1 Comment

willeM_ Van Onsem Over a year ago

Nor with cat ("useless use of cat").

Kasun Rathnayaka · Accepted Answer · 2015-06-18 05:50:50Z

0

you can user below command

awk '{print $1+1}' file.txt  > add.txt
awk '{print $1*5}' file.txt  > malti.txt

answered Jun 18, 2015 at 5:50

Kasun Rathnayaka

5031 gold badge4 silver badges16 bronze badges

Collectives™ on Stack Overflow

Bash script for basic mathematic operations

4 Answers 4

Comments

2 Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

2 Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related