Upload to S3 with expiring link

Upload a file to S3, and create a temporary link for it.

# Add a file to s3 with temporary url, optionally specified in the command line.
if [ -z "$2" ] ; then
    echo "Need at least two arguments:  local source and s3 destination (e.g. file.txt s3://my-bucket/dir)"
	echo "3rd (optional) argument is expiration sends."
	exit 1

if [ -z "$3" ]
    export exp=3600
    export exp=$3

aws s3 cp $1 $2/$1
aws s3 presign $2/$1 --expires-in $exp

echo "expires in $exp seconds"

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