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I am trying to create a .sh script that checks if some IP/Domain like "teamspeak.com" exists in /etc/hosts and if it does not then I want to add something to the hosts file.

Right now I am trying this with:

if ! grep -q "teamspeak.com == teamspeak.com" /etc/hosts; then
    echo "Exists"
else
    echo "Add to etc host ting here" >> /etc/hosts;

fi
JonathanNet
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1 Answers1

13
grep -q

exits with 0 if any match is found, otherwise it exits with 1 so you need to remove ! and == comparison:

if grep -q "teamspeak.com" /etc/hosts; then
    echo "Exists"
else
    echo "Add to etc host ting here" >> /etc/hosts;
fi

Note that it is not word based search so it finds myteamspeak.com or teamspeak.com.us too. To get the whole host name you need to use cut command with delimiters.

To add a new host use:

echo "127.0.0.1 teamspeak.com" >> /etc/hosts
AlecTMH
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  • Great job providing a relevant scripting answer, when the intent of the question probably was off-topic (I think he's asking what should go in the "Add to etc" placeholder... which has nothing to do with programming) – Ben Voigt Mar 16 '15 at 17:05
  • nice seams to work so far but how do I add this if thay not exits http://nopaste.linux-dev.org/?450741 ? allso with tabs ? – JonathanNet Mar 16 '15 at 17:08
  • This fails if there is a commented entry with the term(teamspeak.com) of grep in /etc/hosts file. – Anuruddha Aug 19 '16 at 05:35