Question about comparing two multi-line Bash variables to identify lines that aren't present in the other variable. To accomplish this task, you can use various Bash commands and techniques. Here's one common approach:
Suppose you have two multi-line variables, `$variable1` and `$variable2`, and you want to find lines that are in one variable but not in the other.
Here's a general script you can use:
```bash
# Split variables into arrays
IFS=$'\n' read -rd '' -a array1 <<< "$variable1"
IFS=$'\n' read -rd '' -a array2 <<< "$variable2"
# Find lines in variable1 that aren't in variable2
for line in "${array1[@]}"; do
if [[ ! " ${array2[*]} " == *" $line "* ]]; then
echo "$line is in variable1 but not in variable2"
fi
done
# Find lines in variable2 that aren't in variable1
for line in "${array2[@]}"; do
if [[ ! " ${array1[*]} " == *" $line "* ]]; then
echo "$line is in variable2 but not in variable1"
fi
done
```
This script does the following:
1. Splits the multi-line variables into arrays using the newline character (`$'\n'`) as the delimiter.
2. Iterates through each line in `variable1`, checking if it's in `variable2` using the conditional statement. If not, it prints a message indicating that the line is in `variable1` but not in `variable2`.
3. Then, it repeats the process for lines in `variable2` that are not in `variable1`.
This script will list the lines that are unique to each variable, helping you identify the differences.