如何在bash中填充多行关联数组

Question

I am trying to fill associative array in bash from following example file

interface GigabitEthernet1/0/1
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp
interface GigabitEthernet1/0/2
 mls qos trust dscp
interface GigabitEthernet1/0/3
interface GigabitEthernet1/0/4
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp
interface GigabitEthernet1/0/5
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp
interface GigabitEthernet1/0/6
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp
interface GigabitEthernet1/0/7
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp
interface GigabitEthernet1/0/8
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp

interface GigabitEthernet1/0/1 or GigabitEthernet1/0/1 should be the array key and anything between interface sections should be array key value.

 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp

Expected output should be:

 $echo ${array[GigabitEthernet1/0/4]}
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp

There will be multiple different files with similar format, so this need to be done by loop, the text between interfaces should be 0 to 5-6 lines. The reason behind is I need to do logical test on each interface, if it is correct or not. Below text is correct, anything else, or empty field is incorrect.

 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp

So far i have stuck with formatting of IFS and multilines as the value of array key. I was able to fill non-associative array, but in not the cleanest form.

$ cat test_compare_interface | sed 's/interface.*$/*\n&/g' > test_compare_interface_sed

test_compare_interface is file with interfaces

$ IFS=$'*' && array=($(cat test_compare_interface_sed))
$ echo ${array[4]}

interface GigabitEthernet1/0/4
 srr-queue bandwidth share 10 10 60 20
 priority-queue out 
 mls qos trust dscp

With associative array loop, i am still strugling

while IFS='*' read -r interface value; do array[$interface]=$value ; done < test_compare_interface_sed 

Thank you for all the suggestions.

Answer 1

Would you please try the following:

declare -A array

# assign "${val[*]}" to the assciative array "array" keying with $1
store() {
    if [[ -n $1 ]]; then        # will skip the 1st line which is not ready
        array[$1]=$(IFS=$'\n'; echo "${val[*]}")
                                # join "val" with newline
        unset val               # empty the queue
    fi
}

while IFS= read -r line; do
    if [[ $line =~ ^interface ]]; then
        store "$interface"      # assign to the associative array
        interface="$line"       # for the next iteration
    else
        val+=("${line# }")      # append to the queue
    fi
done < file.txt

store "$interface"              # flush the last entry

for i in "${!array[@]}"; do     # print the array elements to test
    echo "$i"
    echo "${array[$i]}"
done

• It just read the input line by line without modifying IFS .
• If the line starts with "interface", it flushes the queue (array val ) into the associative array and updates the interface name for next iteration.
• If the line does not start with "interface", the line is accumulated in the queue (array val )