[Bashscript] General Tips

foo.txt

1. Command to add to recognize the file type

#!/bin/bash

use .sh extension

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2. To test if file exists

test -e random-file.pdf && echo "EXISTS" || echo "NOT EXISTS"

outputs:
EXISTS

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3. To see if library is installed

comand -v node

outputs:
/usr/local/bin/node


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4. if else syntax

if command -v node; then
    echo "node is installed"
else
    echo "node is not installed"
fi