$ cat writeup.md…
$ cat writeup.md…
hackerlab
Task: TCP service presents a restricted bash shell — commands prefixed with /cmd, 20-char limit, cat/head/tail removed, output containing 'error' blocked. Solution: use rev command to read files (bypasses both length and output filter), enumerate filesystem, find /fl4g.txt, reverse the reversed output to get the flag.
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$sign in$ grep --similar