How to permanently set $PATH on Linux/Unix [closed]

linuxbashunixpathzsh
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How to check if a variable is set in Bash

variablesbashshell
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How do I use floating-point arithmetic in bash?

floating-pointbasharithmetic-expressions
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Looping over pairs of values in bash

bashfor-loopnested-loopspaste
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Why is testing "$?" to see if a command succeeded or not, an anti-pattern?

bashshellsh
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