File output into an array using bash

Question

I have sorted (descending) output in a file in table format from a query I did using aws CLI. I need to take a field from the output file and present all unique lines as an option for user to choose from. Here is an example of output file:

Description        Snapshot             StartTime
Volume0            snap-x123456789      2020-04-22T20:55:10
Volume10           snap-y123456789      2020-04-22T20:45:09
Volume12           snap-a123456789      2020-04-22T20:40:08
Volume15           snap-b123456789      2020-04-22T20:35:07
Volume0            snap-c123456789      2020-04-22T20:30:06
Volume10           snap-d123456789      2020-04-22T20:25:05

The goal is to present all volumes after reading above output and prompt user to enter volume number OR user can enter A for ALL so that system can restore the snapshot(s) for that volume. Something like this:

0 - Volume0
10 - Volume10
12 - Volume12
15 - Volume15

Here is what I have, how can I get the user to enter a number corresponding to the volume number or enter ALL to restore all? Should I be using an array for from the output file? How can I do this efficently?

output() {

    echo "Here is a list of volumes found in $region"

    for DR in (grep Volume# "$input" | top -n 1)
    do 
    echo $DR
    done

    echo "Hello, please tell me what Volume you are searching for..(Volume?):"
    read volSearch

    echo -e "Searching for newest SnapshotIds in region using output file GetfileSnapId for:\n" $volSearch
    echo
    sleep 5
    input="/Users/user/Downloads/GetfileSnapId"


    if x=$(grep -m 1 "$volSearch" "$input")
    then
        echo
        echo "$x"
    else
        echo
        echo "$volSearch not found..ending search"
    fi

    extractSnap=$(echo "$x" | cut -d'|' -f2 )

    echo
    echo $extractSnap

    regionoutput=$(echo "$extractSnap" | awk '{print $4}' )
    echo
    echo "$regionoutput"
}

Richard Jessop · Accepted Answer · 2020-04-24 01:07:45Z

1

Look at the bash select command.

I put the following into a bash script:

#!/bin/bash

options=($(tail +2 t.txt | cut -d' ' -f1 | sort | uniq) Quit)

PS3='Please enter your choice: '
select opt in "${options[@]}"
do
    echo $opt

    if [ $opt = "Quit" ]
    then
        break
    fi
done

edited Apr 24, 2020 at 1:07

answered Apr 22, 2020 at 22:29

Richard Jessop

1,0021 gold badge15 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

NetSystemAdmin Over a year ago

Hi - thank you Richard. How can I read output from file (GetfileSnapId) into select command and a array? I would like to use output from any aws region and present it for user to select any of the volumes or select all volumes.

Richard Jessop Over a year ago

I see your problem. Working it.

Collectives™ on Stack Overflow

File output into an array using bash

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related