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Removing comments and blank spaces

If you want to remove blank lines (using vi):
:g/^$/d


For commented lines (using vi):
:g/^#/d


And for lines where windows editor put ^M and you want to remove (using vi):
:%s/^V^M//g


Note that we cannot just type the accent ^ , instead we must use ^V and then type M, so the final command will look like this (using vi):
:%s/^M//g


The same as above can be reached using egrep:
egrep -v "^#|^$" squid.original > squid.conf


And the same using grep command:
grep -v ^["#"] /etc/squid3/squid.original > /etc/squid3/squid.conf

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