I have a following loop:
for chr in {1..3};
do
futureList="${variable1} ${variable2}"
done
I would like to modify it so that futureList appends new set of variables in each consecutive cycle. Expected outcome should look something like this:
echo $futureList
string1 string2, string3 string4, string5 string6 etc
This is good usecase to use arrays:
var1='string1'
var2='string2'
futureList=() # declare an array
for i in {1..5}; do
futureList+=("$var1 $var2") # inside loop append value to array
done
# check array content
# decclare -p futureList
# or use printf
printf '%s\n' "${futureList[@]}"
string1 string2
string1 string2
string1 string2
string1 string2
string1 string2
futureList appends new set of variables in each consecutive cycle which obviously can be easily done inside the while loop to achieve whatever output.Here is how I would do it.
n=1
for chr in {1..3}; do
array1+=("string$n") array2+=("string$((n+3))")
((n++))
done
Save the formatted output in the variable futurelist.
printf -v futurelist '%s %s, ' "${array1[@]}" "${array2[@]}"
Check the output
echo "$futurelist"
Output
string1 string2, string3 string4, string5 string6,
I'm pretty sure someone will come up with more ways to do better.
