Commands tips & tricks

Système
  1. 1. Infos Reseau
  2. 2. Modification des hosts et dns
  3. 3. Verification execution en root
  4. 4. Proxy
  5. 5. Decompresser à la volée
  6. 6. Add Iptables
  7. 7. Optimisation memoire Java (java heap size)
  8. 8. Changement de cible binaire
  9. 9. Manipulation de variables
  10. 10. Sed tricks
  11. 11. Find tricks
  12. 12. Import propre sql
  13. 13. Windows Startup applications
  14. 14. Systemd Authorize execution from alternative PATH
  15. 15. Tester la presence d’un executable:
  16. 16. Pousser une commande en Background et la récupérer:

Infos Reseau

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IP=$(ip -4 -o a | sed -e '/^2:/!d;s/^.*inet //;s/\/.*$//g')
HOSTNAME=$(hostname -s)

Modification des hosts et dns

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[[ $(grep -E "$IP(.*)$(hostname -s)(.*)" /etc/hosts) ]] || echo -e "$IP    $(hostname -s)" >> /etc/hosts

Verification execution en root

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[[ $(whoami) != root ]] && { echo "ERREUR : Veuillez exécuter ce script en tant que root avec la commande sudo !"; exit 1; }

Proxy

APT:

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echo -e "Acquire::http::Proxy \"${PROXY_URL}/\";" > /etc/apt/apt.conf.d/proxy.conf

System:

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PROXY_URL="http://USER:PASS@HOST:PORT"
echo -e "export http_proxy='${PROXY_URL}'\n
	     export https_proxy='${PROXY_URL}'\n
	     export no_proxy=EXCLUDED_DOMAIN.fr,localhost,127.0.0.1,${HOSTNAME}" > /etc/profile.d/proxy.sh
source /etc/profile.d/proxy.sh

Maven:

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mkdir -p ~/.m2
echo ${http_proxy} | tr "/:@" " " | awk '{print "<settings>\n<proxies>\n<proxy>\n<id>proxy</id>\n<active>true</active>\n<protocol>"$1"</protocol>\n<host>"$4"</host>\n<port>"$5"</port>\n<username>"$2"</username>\n<password>"$3"</password>\n</proxy>\n</proxies>\n</settings>"}' > ~/.m2/settings.xml

Curl:

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echo "proxy = ${http_proxy}" > ~/.curlrc

Decompresser à la volée

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curl -s $PACKAGE_REGISTRY/stedolan/jq/1.6/jq-1.6.tar.gz | tar xz -C /usr/bin/ && chmod +x /usr/bin/jq

Add Iptables

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iptables -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT && iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT && iptables-save 2> /dev/null > /etc/sysconfig/iptables

Optimisation memoire Java (java heap size)

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-Xmx2048m -Xms512m -XX:MaxPermSize=2048m -XX:+UseConcMarkSweepGC -XX:ReservedCodeCacheSize=128m -XX:+HeapDumpOnOutOfMemoryError

Changement de cible binaire

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update-alternatives --set php /usr/bin/php5.6

Alias alternative from vars:
echo "[[ \${php}  ]] && alias php='update-alternatives --set php /usr/bin/php\${php} > /dev/null; php' \
	\n[[ \${node} ]] && alias node='nvm use \${node} >/dev/null; node'" >> ~/.bashrc

Manipulation de variables

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Variable avec nom dynamique (shell): 
varname="toto"
varcontent="content"
$varname=$varcontent

name=${varname}
data=${!varname}

Variable avec nom dynamique (Groovy): 
def OC_CONFIG_PATH="OC_CONFIG_AA"
evaluate("env.${OC_CONFIG_PATH} = \"--config='/tmp/$OC_CONFIG_PATH/config'\" ")
env.OC_CONFIG_PATH="$OC_CONFIG_PATH"
OC_CONFIG_PATH=\${!OC_CONFIG_PATH}
env.KUBECONFIG="/tmp/AA/oc_config_${JOB_BASE_NAME}"

Sed tricks

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change maven version
sed -i -r -e 's#<source>(.*)</source>#<source>1.8</source>#g' -e 's#<target>(.*)</target>#<target>1.8</target>#g' pom.xml

# Export 'exist*' groovy vars outside this shell
echo "\$(env | grep -E '_exist|_version' |sed 's/^/env./')" | tee ${WORKSPACE}/vars.groovy


Find tricks

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find ${builder.buildDir}/ -name "*.sh" -exec chmod +x {} \\;
find ${builder.buildDir}/ -name "*.sh" -exec chmod 755 {} \\;

Import propre sql

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mysql -u root -e "source /db.sql;"

Windows Startup applications

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%AppData%\Microsoft\Windows\Start Menu\Programs\Startup

Systemd Authorize execution from alternative PATH

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semanage fcontext -a -t bin_t "/data/pgsql/bin(/.*)?"
restorecon -RF /data/pgsql/bin

Tester la presence d’un executable:

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command -v <BIN>

Pousser une commande en Background et la récupérer:

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tail -f /dev/null 	#exemple
ctrl + z 			#stop le process
bg 					# le pousse en Background
fg 					# pour récupere le Process

shell show ip hostname proxy tips & tricks
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