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POHow to use while loop to check condition in linux?
 

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    <p>I have to do something like this :</p> <pre><code>while ( condition) do wait </code></pre> <p>I have to do this is in linux. While the state of snapshot is pending it should wait. </p> <p>Content of ec2-describe snapshot is :</p> <pre><code>SNAPSHOT snap-c7f3 vol-f6a0 completed 2013-12-04T09:24:50+0000 100% 109030037527 10 2013-12-04: Daily Backup for SaMachine (VolID:vol-f09a0 InstID:i-2604) SNAPSHOT snap-c7df9 vol-3f6b completed 2013-12-04T09:24:54+0000 100% 109030037527 10 2013-12-04: Daily Backup for sa_test_VPC (VolID:vol-3InstID:i-e1c46) </code></pre> <p>How to do this? How should I use grep and all that ?</p> <pre><code>#!/bin/bash # Setting the environmental variables export EC2_HOME=/opt/ec2/tools export AWS_ACCESS_KEY_ID= export AWS_SECRET_ACCESS_KEY= export SOURCE_REGION="us-west-2" export DESTINATION_REGION="us-east-1" # Set the variable today-date to current date today_date=`date +%Y-%m-%d` echo "$today_date" # Set the variable date_dir to yesterday's date date_dir=$(date +%Y-%m-%d -d '-1 days') echo "$date_dir" #First delete all snapshots older than one day #Create a file with all scheduled snapshots echo "First delete all snapshots older than one day" echo "Create a file with all scheduled snapshots" read -rsp $'Press enter to continue...\n' ec2-describe-snapshots | grep -i "$date_dir"&gt;"$EC2_HOME/SnapshotsDOW_$today_date" #Delete snapshots for older backups echo "Delete snapshots for older backups" read -rsp $'Press enter to continue...\n' for snapshot in $(cat "$EC2_HOME/SnapshotsDOW_$today_date" | awk '{print $2}') do ec2-delete-snapshot $snapshot done #Now create a snapshot for every attached volume to every instance #Create a file with all attached volumes echo "Create a file with all attached volumes" read -rsp $'Press enter to continue...\n' #ec2-describe-volumes | grep -i "attached" &gt;"$EC2_HOME/ActiveVolumes_$today_date" #Create a file with all instances echo "Create a file with all instances" read -rsp $'Press enter to continue...\n' ec2-describe-instances | grep -i "tag" | grep -i "name" &gt;"$EC2_HOME/Instances_$today_date" #Create snapshots of all attached volumes echo "Create snapshots of all attached volumes" read -rsp $'Press enter to continue...\n' awk '{print $2, $3}' "$EC2_HOME/ActiveVolumes_$today_date" | while read vol_id inst_id; do awk '{print $3, $5}' "$EC2_HOME/Instances_$today_date" | while read inst_id2 name; do if test "$inst_id" = "$inst_id2"; then echo ec2-create-snapshot "$vol_id" -d "$today_date: Daily Backup for $inst_id (VolID:$vol_id InstID:$inst_id)" ec2-create-snapshot "$vol_id" -d "$today_date: Daily Backup for $inst_id (VolID:$vol_id InstID:$inst_id)" fi done done #Create a file with all latest snapshots echo "Create a file with all latest snapshots" read -rsp $'Press enter to continue...\n' latestdate=$(ec2-describe-snapshots | grep ^SNAPSHOT | sort -rk 5 | awk '{print substr($5, 1, 10); exit}') ec2-describe-snapshots | grep "^SNAPSHOT.*$latestdate" &gt; "$EC2_HOME/SnapshotsLatest_$today_date" #Copy the snapshot across multiple regions. echo "Copy the snapshot across multiple regions." read -rsp $'Press enter to continue...\n' for snapshot in $(cat "$EC2_HOME/SnapshotsLatest_$today_date" | awk '{print $2}') do ec2-copy-snapshot -r $SOURCE_REGION -s $snapshot -region $DESTINATION_REGION done #Send the latest snapshot details to user using mail command. echo "Send the latest snapshot details to user using mail command" read -rsp $'Press enter to continue...\n' mail -s 'VM Snapshot $today_date' jp.com &lt; "$EC2_HOME/SnapshotsLatest_$today_date" read -rsp $'Press enter to exit...\n' </code></pre>
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    1. COWhat command do you use to get that output?
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    2. COec2-describe-snapshots ( an ec2-command line utility )
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    3. CODo you need all snapshots to be completed or are you just looking for a specific snapshot?
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