How to remove a line starting and ending with different strings from a file

Question

I have a file like this:

@          IN     NS                 ns1.riodomain.com.
@          IN     A                  192.175.3.255
@          IN     MX     10          root@ns1.riodomain.com.
mail       IN     A                  192.164.2.228
ns1        IN     A                  192.164.2.333

After executing i need to get as follows

@          IN     A                  192.175.3.255
@          IN     MX     10          root@ns1.riodomain.com.
mail       IN     A                  192.164.2.228
ns1        IN     A                  192.164.2.333

I need to remove the first line with specific pattern. Can anyone help?

Answer 1

According to your requirement(literally):

I need to delete line that start with @ and ends with string like riodomain.com. or 192.164.2.333

sed approach:

sed -i '/^@.*\(riodomain\.com\.\|192\.164\.2\.333\)$/d' file

Now, the file contents should look like:

@ IN A 192.175.3.255
mail IN A 192.164.2.228
ns1 IN A 192.164.2.333

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-i - option, to modify file in place

/d - flag, tells to delete the lines matched the pattern