echo "$(tail -n 10000 huge.log)" > huge.log<\/code><\/pre>\nDeploy maven artefact to a specific repo without specifying it in pom.xml (format repoId:default:repoUrl<\/strong>). Repo should be specified in your .m2 settings.xml with any necessary credentials.<\/p>\nmvn deploy -DaltDeploymentRepository=repo.mydomain.com.my.releases::default::https:\/\/repo.mydomain.com\/repository\/maven-my-releases\/<\/code><\/pre>\nOne liner to set password for default PostgreSQL user after initial install.<\/p>\n
runuser -l postgres -c $'psql -c "ALTER USER postgres WITH PASSWORD \\'postgres\\';"'<\/code><\/pre>\nRun command inside a screen and save all output to a file<\/p>\n
screen -dm bash -c 'script -c "some chatty command" output.txt'<\/code><\/pre>\nScroll around inside a screen.<\/p>\n
screen -r myscreen\n\nctrl+a\n\n[\n\nctrl+u and ctrl+d for up and down. bufer is limited<\/code><\/pre>\nAdd 4GB swap on Centos 7 with a stroke of a copy-paste.<\/p>\n
sudo dd if=\/dev\/zero of=\/swapfile count=4096 bs=1MiB\nsudo chmod 600 \/swapfile\nsudo mkswap \/swapfile\nsudo swapon \/swapfile\necho '\/swapfile none swap sw 0 0' | sudo tee -a \/etc\/fstab<\/code><\/pre>\nStandard tcpdump.<\/p>\n
tcpdump -i eth0 -s 65535 -w dump.pcap<\/code><\/pre>\nShow listening ports with corresponding executables.<\/p>\n
netstat -tulpn<\/code><\/pre>\nShow systemd logs for a specific service.<\/p>\n
journalctl -u nginx.service<\/code><\/pre>\nFreshly installed nginx configured as reverse proxy on Centos 7 getting \"Permission denied\" when connecting to backend service<\/p>\n
setsebool -P httpd_can_network_connect 1<\/code><\/pre>\nConvert a certificate stored in a Java keystore to a PEM cert and key (for example, Tomcat to Nginx transition).<\/p>\n
$JAVA_HOME\/bin\/keytool -importkeystore -srckeystore .keystore -destkeystore keystore.p12 -deststoretype PKCS12 -srcalias mycrtalias -deststorepass changeit -destkeypass changeit\nopenssl pkcs12 -in keystore.p12 -nokeys -out cert.pem\nopenssl pkcs12 -in keystore.p12 -nodes -nocerts -out key.pem<\/code><\/pre>\nDisable git SSL verification per-repo.<\/p>\n
git config http.sslVerify "false"<\/code><\/pre>\nDisable git SSL verification at clone time.<\/p>\n
git -c http.sslVerify=false clone something<\/code><\/pre>\nClear git username and password cache for a repo (in case of password change or similar).<\/p>\n
git config --global --unset user.password<\/code><\/pre>\nGive user sudo privileges.<\/p>\n
sudo usermod -aG wheel <user><\/code><\/pre>\nGit submodule is added to an existing repo and is not resolving for you locally.<\/p>\n
git submodule update --init --recursive<\/code><\/pre>\nPrint all TCP connections of a Docker container.<\/p>\n
sudo docker inspect -f '{{.State.Pid}}' containerName\n<result>\nsudo nsenter -t <result> -n netstat<\/code><\/pre>\nNmap portscan.<\/p>\n
sudo nmap -p 1-65535 -sV -sS -T4 <ip><\/code><\/pre>\nForce JVM to use \/dev\/urandom instead of \/dev\/random (sometimes needed in low entropy environments like Docker).<\/p>\n
java -Djava.security.egd=file:\/dev\/.\/urandom ...<\/code><\/pre>\nDebug print all network activities on JVM level.<\/p>\n
java -Djavax.net.debug=all ...<\/code><\/pre>\nCreate .htpasswd file for Nginx<\/p>\n
sudo sh -c "echo -n 'someuser:' >> \/etc\/nginx\/.htpasswd"\nsudo sh -c "openssl passwd -apr1 >> \/etc\/nginx\/.htpasswd"<\/code><\/pre>\nDo or do not do something if file was modified recently<\/p>\n
RECENTLY_CHANGED=$(find \/tmp\/me -newermt '10 minutes ago' |wc -l |xargs)\nif [ "$RECENTLY_CHANGED" -eq 1 ]; then\n echo "File was changed recently, terminating script"\n exit 0\nfi<\/code><\/pre>\n <\/p>\n
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Cen
\r\nGitHub<\/a>
\r\nEurobattle.net<\/a>
\r\nLagabuse.com<\/a>
\r\nBnetdocs<\/a>
\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"Keep only last X lines of a file (shrink). echo "$(tail -n 10000 huge.log)" > huge.log Deploy maven artefact to a specific repo without specifying it in pom.xml (format repoId:default:repoUrl). Repo should be specified in your .m2 settings.xml with any necessary credentials. mvn deploy -DaltDeploymentRepository=repo.mydomain.com.my.releases::default::https:\/\/repo.mydomain.com\/repository\/maven-my-releases\/ One liner to set password for default PostgreSQL user after […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,18],"tags":[23],"class_list":["post-181","post","type-post","status-publish","format-standard","hentry","category-linux","category-script-magic","tag-bashmagic"],"_links":{"self":[{"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/posts\/181","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=181"}],"version-history":[{"count":14,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/posts\/181\/revisions"}],"predecessor-version":[{"id":539,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=\/wp\/v2\/posts\/181\/revisions\/539"}],"wp:attachment":[{"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=181"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=181"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xpam.pl\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}