The command line is your friend. The Linux Bash Shell (or an equivalent) is installed on nearly every production server. You do not need to use it for everything, but should feel comfortable using it for incidents and real-time/deeper debugging. One of the best resources that I’ve found is a book called Linux Command Line by William Shotts. The resource teaches many of the tools available on Linux systems to solve a wide variety of problems. It also includes an introduction to Bash scripting.
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Command Line
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