#!/bin/bash
cd ~/Desktop;
thefile= ls -t -U | grep -m 1 "Screen Shot";
echo "Most recent screenshot is: "$thefile;

Screen Shot 2011-07-03 at 1.55.43 PM.png
Most recent screenshot is:

thefile=$(ls -t -U | grep -m 1 "Screen Shot")

thefile=$(ls -t *"Screen Shot"* | head -n 1)

echo "Most recent screenshot is: $thefile"

thefile=$(find -maxdepth 1 -type f -name "*Screen Shot*" -printf "%T@ %p" |
          sort -k 1n | tail -n 1)

#!/bin/zsh
set -e
cd ~/Desktop
thefile=(*"Screen Shot"*(om[1]))
echo "Most recent screenshot is: $thefile"