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How to prepend or append to a variable in bash
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| # Prepend to a variable | |
| export PATH=/foo${PATH:+:$PATH} # Set path to "/foo:$PATH", or "/foo" if $PATH is empty | |
| # Append to a variable | |
| export PATH=${PATH:+$PATH:}/foo # Set path to "$PATH:/foo", or "/foo" if $PATH is empty |
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