Uptime: show the machine’s latest boot up time and running time. Can use to track when it restarted difference between && and ; when executing shell commands: using ; when the first command fails, the second command will still be executed using && when the first command fails, the second command will not be executed Change user accessibility of a file or directory: sudo chmod 777 /home/pi/schedule/sampleFile When cannot press tab to auto-fill filenames: Possible reason 1: root disk full, df –h will show this Possible reason 2: lost writing access to /tmp. Check /tmp access permissions, which should like this: ls - l / | grep tmp drwxrwxrwt 7 root root 4096 Nov 7 17 : 17 tmp if current user does not have write access, then sudo chmod a + rwxt / tmp get system and hardware specs : for command line solutions, you can use the command lshw. Install it if needed: sudo apt-get insta...
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