I have text file like this:
src_dir=source1
src_dir=source2
dst_dir=dest1
whatever_thing=thing1
whatever_thing=thing2
I want a script that will create arrays with names from the left part of a line and fill it with elements from the right part of a line. So basically it should do:
src_dir=(source1 source2)
dst_dir=(dest1)
whatever_thing=(thing1 thing2)
I've tried so far:
while read -r -a line
do
IFS='= ' read -r -a array <<< "$line"
"${array[0]}"+="${array[1]}"
done < file.txt
If your bash version is 4.3 or newer, declare has an -n option
to define a rerefence to the variable name which works as a reference in C++.
Then please try the following:
while IFS== read -r key val; do
declare -n name=$key
name+=("$val")
done < file.txt
# test
echo "${src_dir[@]}"
echo "${dst_dir[@]}"
echo "${whatever_thing[@]}"
try this:
#!/bin/bash
mapfile -t arr < YourDataFile.txt
declare -A dict
for line in "${arr[@]}"; do
key="${line%%=*}"
value="${line#*=}"
[ ${dict["$key"]+X} ] && dict["$key"]+=" $value" || dict["$key"]="$value"
done
for key in "${!dict[@]}"; do
printf "%s=(%s)\n" "$key" "${dict["$key"]}"
done
explanation
# read file into array
mapfile -t arr < YourDataFile.txt
# declare associative array
declare -A dict
# loop over the data array
for line in "${arr[@]}"; do
# extract key
key="${line%%=*}"
# extract value
value="${line#*=}"
# write into associative array
# - if key exists ==> append value
# - else initialize entry
[ ${dict["$key"]+X} ] && dict["$key"]+=" $value" || dict["$key"]="$value"
done
# loop over associative array
for key in "${!dict[@]}"; do
# print key=value pairs
printf "%s=(%s)\n" "$key" "${dict["$key"]}"
done
output
dst_dir=(dest1)
src_dir=(source1 source2)
whatever_thing=(thing1 thing2)
