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A system administrator needs to find all files in /var/log that have been modified in the last 2 hours. Which command should be used?
Option A is correct because the `find` command with `-mmin -120` searches for files whose data was modified (changed content) within the last 120 minutes. This directly matches the requirement to find files modified in the last 2 hours in /var/log.
A user complains that the 'ls' command no longer outputs colors. The administrator suspects a change in environment variables. Which command would help diagnose the issue?
Option C is correct because the `env` command displays all current environment variables, which directly affect the behavior of commands like `ls`. The `ls` command uses the `LS_COLORS` environment variable to determine color output; if this variable is missing or altered, colors…Read full explanation
During a security audit, an administrator needs to list all TCP ports on which the system is listening, showing only the port numbers and the associated process names. Which command best achieves this?
Option C is correct because `sudo ss -tlnp` lists TCP listening sockets with numeric port numbers and process names. The `-t` flag filters for TCP, `-l` shows only listening sockets, `-n` displays numeric addresses/ports (avoiding DNS resolution), and `-p` reveals the process nam…Read full explanation
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