Which of the following commands is commonly used by attackers to scan for open ports on a target machine?
nmap
ls
grep
ps
The 'nmap' command is widely used by attackers to discover open ports and services on a target machine. It can provide detailed information about networked systems that could be exploited for vulnerabilities. Other commands like 'ls', 'grep', and 'ps' are standard commands used for file listing, pattern searching, and process listing, respectively, and are not typically used for network scanning.
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