bash shell script to setup EPICS developer's environment

epics-env-setup.sh

#!/bin/bash

# file: epics-env-setup.sh
# purpose:  bash shell script to setup EPICS developer's environment

# usage:
#   .  /complete/path/to/epics-env-setup.sh

# example for ~/.bash_aliases file:
#    _script=/usr/local/epics/epics-env-setup.sh
#    if [ -f "${_script}" ]; then 
#      . "${_script}"
#    fi
#    unset _script


export EPICS_ROOT_DIR=/usr/local/epics
export EPICS_BASE=${EPICS_ROOT_DIR}/base-7.0.2


function appendPath() {
    addition=$1        # addition must be a directory name
    if [ -d "${addition}" ] && [[ "${PATH}" != *"${addition}"* ]]; then
        # append only if not already in PATH
        export PATH=${PATH}:${addition}
    fi
    unset addition
}


if [ -d "${EPICS_BASE}" ]; then
    export EPICS_HOST_ARCH=`${EPICS_BASE}/startup/EpicsHostArch`
    export EPICS_BASE_BIN=${EPICS_BASE}/bin/${EPICS_HOST_ARCH}
    export EPICS_BASE_LIB=${EPICS_BASE}/lib/${EPICS_HOST_ARCH}
    appendPath ${EPICS_BASE_BIN}
    
    if [ -d "${EPICS_ROOT_DIR}/opi" ]; then
        export EPICS_EXT_DIR=${EPICS_ROOT_DIR}/opi
    elif [ -d "${EPICS_ROOT_DIR}/extensions" ]; then
        export EPICS_EXT_DIR=${EPICS_ROOT_DIR}/extensions
    fi
    if [ -d "${EPICS_EXT_DIR}" ]; then
        export EPICS_EXT_BIN=${EPICS_EXT_DIR}/bin/${EPICS_HOST_ARCH}
        export EPICS_EXT_LIB=${EPICS_EXT_DIR}/lib/${EPICS_HOST_ARCH}
        appendPath ${EPICS_EXT_BIN}
    fi
    
    export SYNAPPS_SUPPORT_DIR=${EPICS_ROOT_DIR}/synApps/support
    appendPath ${SYNAPPS_SUPPORT_DIR}/utils
fi