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Actually i have to modify one configuration file for mine virtual machine. I got on file named "local.conf".

In this file there is line on which following is written : 

DL_DIR ?= ${topdir}/downloads

What is the meaning of this and also what is significance of dollar command in linux shell.

In fact there are several commands in this file which starts with dollar command.

P....
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  • What kind of virtualisation software do you use? What exactly do you need to change in the file and why? – SaschaM78 Sep 14 '16 at 08:43
  • Thanks for reply.Actually i am using Oracle VM virtual box. In this virtual machine i am trying to build an boot image for embedded linux called the"Yocto Linux".So to build this i got an pre wriiten script file named "local.conf" and this need to customised as per mine requirement. But as i mentioned there are many commands in this file which are dolar sign either at the end or start and unable to understand the function of these lines. Unless i will understand this i can not customise this fully. – aditya kumar chaudhary Sep 14 '16 at 08:55
  • http://stackoverflow.com/questions/448910/makefile-variable-assignment – P.... Sep 14 '16 at 08:58
  • In mine config file there is one more line on which following is written. Machine ??= "zedboard". I went through the links that you have posted and i understood the things. But what is meaning of double question mark(??) in the assignment. – aditya kumar chaudhary Sep 14 '16 at 09:34

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