$which glxgears /usr/bin/glxgears $rm /usr/bin/glxgears rm: remove write-protected regular file ‘/usr/bin/glxgears’? y rm: cannot remove ‘/usr/bin/glxgears’: Permission denied $sudo rm /usr/bin/glxgears [sudo] password for jeffrin: $ps aux | grep glxgears jeffrin 2469 4.4 0.6 157656 20888 pts/0 Sl+ 22:43 0:07 glxgears jeffrin 2515 0.0 0.0 12656 1560 pts/1 S+ 22:46 0:00 grep glxgears $sudo cat …
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