get and encode a frame from each element in a array of RTSP hosts, saves output to .jpg file using the last ip octet and timestamp to generate names

snapRTSParray.sh

#!/bin/bash

declare -a hosts=(
    "192.168.0.21"
    "192.168.0.22"
    "192.168.0.23"
    "192.168.0.24"
)
user="user"
pwd="password"
path="/home/user/snaps/"

if ! [ -x "$(command -v /usr/bin/avconv)" ]; then
    echo 'Error: avconv is not installed.' >&2
    exit 1
else
    for i in  "${hosts[@]}"
    do
        cam=$(echo $i| cut -d'.' -f 4)
        timestamp=$(date +"%T")
        /usr/bin/avconv -rtsp_transport tcp -i rtsp://"$user":"$pwd"@"$i":554 -r 1 -vsync 1 -qscale 1 -frames 1 -f image2 "$path"cam"$cam"."$timestamp".jpg
    done
fi