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Lets say I made a List of installed packages by:

rpm -qa > list

I want to use this list to re-install those Packages on another System, For Example By:

yum -y install $(cat list)  

But I need to write some comments in that list, How can I prevent yum from trying to install that Comment lines?

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up vote 9 down vote accepted

Assume that you have # at beginning of comment lines, so you can do:

yum -y install $(awk '!/^#/' list)

!/^#/ cause awk to ignore any lines that start with #, print the rest.

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