I have a bash script as below which installs zookeeper but only if not installed already.##zookeperinstallZook(){        ZOOK_VERSION=3.4.5        ZOOK_TOOL=zookeeper-${ZOOK_VERSION}        ZOOK_DOWNLOAD_URL=http://www.us.apache.org/dist/zookeeper/${ZOOK_TOOL}/${ZOOK_TOOL}.tar.gz        if [ -e $DEFAULT_INSTALLATION_DEST/${ZOOK_TOOL} ]; then                echo ${ZOOK_TOOL} alreay installed;                exit 1;      # <<<< here        elif [ ! -e $DEFAULT_SOURCE_ROOT/${ZOOK_TOOL}.tar.gz ]; then                wgetIt $ZOOK_DOWNLOAD_URL        else                echo [info] : $DEFAULT_SOURCE_ROOT/$ZOOK_TOOL already exists        fi        sudo mkdir -p /var/lib/zookeeper        sudo mkdir -p /var/log/zookeeper        tarIt $DEFAULT_SOURCE_ROOT/$ZOOK_TOOL.tar.gz        sudo chmod 777 -R $DEFAULT_INSTALLATION_DEST/$ZOOK_TOOL        cp $DEFAULT_INSTALLATION_DEST/$ZOOK_TOOL/conf/zoo_sample.cfg $DEFAULT_INSTALLATION_DEST/$ZOOK_TOOL/conf/zoo.cfgcat >> ~/.bash_profile <<'EOF'  ###############################  ########### ZOOK ###############  ###############################  ZOOK_HOME=/usr/local/zookeper-3.4.5  export ZOOK_HOME  export PATH=$PATH:$ZOOK_HOME/binEOF}At the line marked <<<< here, if zookeeper is already installed, what I want is to exit the script below it. But using exit exits the terminal itself.
Exit the bash function, not the terminal
bash;shell script;function;exit
If launching a script with an exit statement in it, you have to launch it as a child of you current child. If you launch it inside the current shell of started with your terminal session (using . ./<scriptname> any exit will close the main shell, the one started along your terminal session.If you had launched your script like bash ./<scriptname> (or any other shell instead of bash), then exit would have stopped your child shell and not the one used by your terminal.If your script has executable permissions, executing it directly without giving the name of the shell will execute it in a child shell too.Using return instead of exit will allow you to still launch your script using . ./<script name> without closing the current shell. But you need to use return to exit from a function only or a sourced script (script ran using the . ./<scriptname> syntax).