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1. Two methods to timeout a read comman... Two methods to timeout a read command in a shell script

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   #!/bin/bash

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   echo "The first method uses the TMOUT environment variable."

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   TMOUT=15

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   echo -n "You have 15 seconds to enter your name: "

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   read name

2. How to use vi effectively How to use vi effectively

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   # Essential `vi`

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   1. `vi` has multiple modes, and it starts in command mode, not editing mode.

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   > In command mode, almost every key on the keyboard is mapped to run a specific command or movement, while other keys reference objects.

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