Usage

It reads from stdin and writes to stdout:

$ cat > sample.properties
teamcity.agent.jvm.file.encoding=UTF-8
teamcity.agent.jvm.file.separator=/
teamcity.agent.jvm.os.arch=amd64
teamcity.agent.jvm.os.name=Linux
teamcity.agent.jvm.os.version=3.13.0-43-generic
teamcity.agent.jvm.path.separator=\:
teamcity.agent.jvm.specification=1.8
teamcity.agent.jvm.user.country=US
teamcity.agent.jvm.user.home=/home/teamcity
runParam.script.content=\#\!/bin/bash\n\nset -o errexit\n\# set -o xtrace\n\necho "*** <Root project> \:\: \\"run pipeline script\\"

$ jprops2bash < sample.properties
export TEAMCITY_AGENT_JVM_FILE_ENCODING='UTF-8'
export TEAMCITY_AGENT_JVM_FILE_SEPARATOR='/'
export TEAMCITY_AGENT_JVM_OS_ARCH='amd64'
export TEAMCITY_AGENT_JVM_OS_NAME='Linux'
export TEAMCITY_AGENT_JVM_OS_VERSION='3.13.0-43-generic'
export TEAMCITY_AGENT_JVM_PATH_SEPARATOR=':'
export TEAMCITY_AGENT_JVM_SPECIFICATION='1.8'
export TEAMCITY_AGENT_JVM_USER_COUNTRY='US'
export TEAMCITY_AGENT_JVM_USER_HOME='/home/teamcity'
export RUNPARAM_SCRIPT_CONTENT='#!/bin/bash\n\nset -o errexit\n# set -o xtrace\n\necho "*** <Root project> :: \"run pipeline script\"'

and if you wanted to set environment variables for all of these you could do something like the following:

$ env | grep TEAM
$ eval $(jprops2bash < sample.properties)
$ env | grep TEAM
TEAMCITY_AGENT_JVM_SPECIFICATION=1.8
TEAMCITY_AGENT_JVM_OS_NAME=Linux
TEAMCITY_AGENT_JVM_PATH_SEPARATOR=:
TEAMCITY_AGENT_JVM_FILE_SEPARATOR=/
TEAMCITY_AGENT_JVM_OS_ARCH=amd64
TEAMCITY_AGENT_JVM_USER_HOME=/home/teamcity
TEAMCITY_AGENT_JVM_FILE_ENCODING=UTF-8
TEAMCITY_AGENT_JVM_USER_COUNTRY=US
TEAMCITY_AGENT_JVM_OS_VERSION=3.13.0-43-generic