```bash#!/bin/bashcurl -s "https://storage.googleapis.com/gctf-2018-attachments/5a0fad5699f75dee39434cc26587411b948e0574a545ef4157e5bf4700e9d62a" -o letter.zipunzip -q letter.zippdftotext -q challenge.pdfgrep -Eo "CTF{.*}" challenge.txtls | grep -v getflag.sh | xargs rm -r```