I would like to truncate the output of a shell script and only print the part between the last line matching a string/regex and EOF.
E.g when running letsencrypt certbot renew --post-hook "service apache2 reload; service nginx reload" I get something like
... http-01 challenge for domain1.tld Waiting for verification... Cleaning up challenges ------------------------------------------------------------------------------- new certificate deployed without reload, fullchain is /etc/letsencrypt/live/domain1.tld/fullchain.pem ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Processing /etc/letsencrypt/renewal/domain2.tld ------------------------------------------------------------------------------- Renewing an existing certificate Performing the following challenges: http-01 challenge for domain.tld http-01 challenge for www.domain2.tld Waiting for verification... Cleaning up challenges ------------------------------------------------------------------------------- new certificate deployed without reload, fullchain is /etc/letsencrypt/live/domain2.tld/fullchain.pem ------------------------------------------------------------------------------- ** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates below have not been saved.) Congratulations, all renewals succeeded. The following certs have been renewed: /etc/letsencrypt/live/domain1.tld/fullchain.pem (success) /etc/letsencrypt/live/domain2.tld/fullchain.pem (success) /etc/letsencrypt/live/domain3.tld/fullchain.pem (success) /etc/letsencrypt/live/domain4.tld/fullchain.pem (success) ** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates above have not been saved.) Running post-hook command: service apache2 reload; service nginx reload Output from service: * Reloading web server apache2 * * Reloading nginx configuration nginx ...done.
Now what I want to have is everything after the last ------- line, so the desired result would be
** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates below have not been saved.) Congratulations, all renewals succeeded. The following certs have been renewed: /etc/letsencrypt/live/domain1.tld/fullchain.pem (success) /etc/letsencrypt/live/domain2.tld/fullchain.pem (success) /etc/letsencrypt/live/domain3.tld/fullchain.pem (success) /etc/letsencrypt/live/domain4.tld/fullchain.pem (success) ** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates above have not been saved.) Running post-hook command: service apache2 reload; service nginx reload Output from service: * Reloading web server apache2 * * Reloading nginx configuration nginx ...done.
I thought about some tail -n 15 command but I don’t want to adjust my script each time I add a new domain.
Thanks for your help!
Edit: In the meantime I found a solution on my own which is not as nice as @anubhava’s
cnt1=`grep -n "----" certbot.log | tail -n1 | awk -F : '{ print $1 }'`
cnt2=`wc -l certbot.log | awk '{ print $1 }'`
cnt3=$((cnt2-cnt1))
tail -n $cnt3 certbot.log
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Answer
You can use awk for this:
awk '/^-{6}/{p=1; str=""; next} p{str = str $0 ORS} END{printf "%s", str}' file
This awk command matches ------ as starting text in any line and once it finds it we set a flag p to 1 and initialize a buffer str to empty. Next we keep adding each line into buffer str if flag p is set.
Note that if we encounter another ------ then we reinitialize str to empty hence keeping lines from only last matched occurrence.
Output:
** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates below have not been saved.) Congratulations, all renewals succeeded. The following certs have been renewed: /etc/letsencrypt/live/domain1.tld/fullchain.pem (success) /etc/letsencrypt/live/domain2.tld/fullchain.pem (success) /etc/letsencrypt/live/domain3.tld/fullchain.pem (success) /etc/letsencrypt/live/domain4.tld/fullchain.pem (success) ** DRY RUN: simulating 'certbot renew' close to cert expiry ** (The test certificates above have not been saved.) Running post-hook command: service apache2 reload; service nginx reload Output from service: * Reloading web server apache2 * * Reloading nginx configuration nginx ...done.
Alternative solution is to use tac before and after awk and print only first match:
tac file | awk '/^-{6}/{exit} 1' | tac