Replace environment variables in a file with their actual values?
# config.xml
<property>
<name>instanceId</name>
<value>$INSTANCE_ID</value>
</property>
<property>
<name>rootPath</name>
<value>/services/$SERVICE_NAME</value>
</property>
envsubst < config.xml
( echo "cat <<EOF" ; cat config.xml ; echo EOF ) | sh
eval "echo \"$(cat config.xml)\""
(. .env && eval "echo \"$(cat config.xml)\"")compgen -e | xargs -I @ sh -c 'printf "s|\$%q\>|%q|g\n" "@" "$@"' | sed -f /dev/stdin input.file > output.file标签：xml,shell,file,echo,template,linux,cat,config From： https://www.cnblogs.com/shaohef/p/17539313.html