Unlike other participants, I could not just make `find` work for me, so I had to find another way.
Fortunately, there's a very nice tool called `fatcat `. It can show directory listing without mounting an image, and it also shows "real" inodes:
```% fatcat -l / strcmp.fat32 Listing path /Directory cluster: 2d 1/1/1980 00:00:00  SPACE/                         c=758d 1/1/1980 00:00:00  !/                             c=1406d 1/1/1980 00:00:00  #/                             c=1618d 1/1/1980 00:00:00  $/                             c=1254d 1/1/1980 00:00:00  %/                             c=1406d 1/1/1980 00:00:00  &/                             c=1618...```
So the procedure was:
* Create a blacklist of "invalid" inodes. It's very easy, because we know that flag starts with "PCTF{"* Just go level down until the flag is complete ignoring directories that link to blacklisted inodes.
Creating a blacklist of inodes (also had to add some manually):
```for symbool in $(cat all-symbols); do fatcat strcmp.fat32 -l "/$symbol" | awk '{print $5}' | cut -d= -f2 | grep -v '^$'; done | sort | uniq  >> bad-inodes```
Creating regexp list:
```cat bad-inodes | sort | uniq | while read s; do echo 'c='$s'$'; done > r```
Final iterating looked like this:
```% fatcat strcmp.fat32 -l '/P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/' | grep -vf r
Listing path /P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/Directory cluster: 950d 1/1/1980 00:00:00  P/                             c=1110d 1/1/1980 00:00:00  S/                             c=1454f 1/1/1980 00:00:00  TOOBAD                         c=1842 s=0 (0B)% fatcat strcmp.fat32 -l '/P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/S/' | grep -vf r
Listing path /P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/S/Directory cluster: 1454d 1/1/1980 00:00:00  P/                             c=1110d 1/1/1980 00:00:00  Y/                             c=622f 1/1/1980 00:00:00  NOMATCH                        c=1842 s=0 (0B)
....% fatcat strcmp.fat32 -l '/P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/S/Y/S/T/E/M/!/}/' | grep -vf r
Listing path /P/C/T/F/{/W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/_/T/H/1/S/_/F/I/L/E/S/Y/S/T/E/M/!/}/Directory cluster: 1638```
The challenge was generated with this tool: https://github.com/8051Enthusiast/regex2fat