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6

I have very long export PATH=A:B:C .... Can I make a multiple lines to have more organized one as follows? 

export PATH = A:
              B:
              C:
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up vote 9 down vote accepted

You can do:

export PATH="A"
export PATH="$PATH:B"
export PATH="$PATH:C"

Each subsequent line appends onto the previously defined path. This is generally a good habit, as it avoids trashing the existing path. If you want the new component to take precedence, swap the order:

export PATH="A"
export PATH="B:$PATH"
export PATH="C:$PATH"

Alternatively, you might be able to do:

export PATH=A:\
B:\ 
C

where \ marks a line continuation. Haven't tested this method.

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Note that export is a built-in command, not a keyword nor a syntactic assignment. So if you have PATH elements containing whitespace (or glob characters), you do need double quotes around export PATH="$PATH:B". You could also write PATH=$PATH:B and so on; you only need to export a variable once, not every time it changes (except in some very old Bourne shells), and you don't need the double quotes in an assignment. – Gilles May 17 '11 at 20:37
    
Also PATH+=:B works for string concatenation. – Aryeh Leib Taurog Jul 17 '13 at 20:24
up vote 2 down vote

You can extend lines in bash using a backslash at the end of a line like this:

export PATH=/path/A:\
/path/B:\
/path/C

Please note that the absence of white space is important here.

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