How to keep from duplicating path variable in ksh

StackOverflow https://stackoverflow.com/questions/586741

  •  06-09-2019
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Question

Similar question to How to keep from duplicating path variable in csh. But I don't use csh.

PATH=${SOMETHING}:${PATH}

How do I remove duplicates from PATH.

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Solution

I use this oneliner, but it depends on gawk.

PATH=$(echo $PATH|tr ":" "\n"|gawk '!($0 in a) { a[$0];print}'|paste -sd: - )
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