Arrays in bash shell scripts

Question

#!/bin/sh
# Script to count the total in an array
# Define the name of the file
#
fname=names.txt

# Read in the contact details from the keyboard
echo "Please enter the following contact details:"
echo
echo "Given name: \c"
read name
echo " value: \c"
read value
# Write the details to the text file
echo $name:$value >> $fname

I'm trying to code something in bash scripting, I have a txt file and I entered the following names on it e.g

lex +7.5
creg +5.3
xondr/xonde +1.5
gloria-1
lex +7.5
gloria -1
creg +5.3
xondr/xonde +1.5
lex +7.5
#and so on

I want a code or a loop that when I run the program it should show the names of that are on the txt file and show there total,if lex appears 7 times and gloria 3 times it will show lex 52.5 gloria-3 etc. I don't know if you get my idea...

Does it really have to be a shell script? I'm not trolling, just asking. — Rob Cowie
– Rob Cowie, Commented Nov 17, 2011 at 19:51
If this is homework for school, you should tag it as such. Good luck. — shellter
– shellter, Commented Nov 17, 2011 at 20:24

William Pursell · Accepted Answer · 2011-11-17 20:23:15Z

2

It sounds like you want something like:

$ awk '{x[$1] += $2} END {for( i in x) print i, x[i]}' input-file

answered Nov 17, 2011 at 20:23

William Pursell

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3 Comments

Dave L. Over a year ago

Le mort saisit le vif. I <3 awk on occasion.

Gilles Quénot Over a year ago

Tiens un Français. Mais je comprend pas pour autant l'expression.

jlliagre Over a year ago

@sputnick: Je pense que l'idée est quelque chose comme 'Le Roi est mort, vive le Roi !'

l0b0 · Accepted Answer · 2011-11-18 12:32:53Z

0

#!/usr/bin/env bash

awk '{people[$1] += $2} END {for (person in people) 
{ printf("%s %10.2f\n",person,people[person])}}' test.txt

edited Nov 18, 2011 at 12:32

l0b0

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answered Nov 17, 2011 at 20:41

Rob Cowie

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2 Comments

Gilles Quénot Over a year ago

Yes "it works", but you spawn a useless process. awk read files itself ;)

thequantumtheories Over a year ago

im trying to add this code you gave me but its not working im new to bash,may you help me with a sample script or where to put it in my code..thanks

ata · Accepted Answer · 2011-11-18 00:17:17Z

0

#!/bin/bash
declare -A names
declare name num

#sum
while IFS=" " read name num; do
    names[$name]=$( bc <<< "${names[$name]:-0}$num" )
done

#print
for name in ${!names[@]}; do
    echo "$name: ${names[$name]}"
done

Something like this? Depends on the two fields being separated by space and the numbers being prepended with + or - though.

edited Nov 18, 2011 at 0:17

answered Nov 17, 2011 at 20:23

ata

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