setup aliases for sourcing ROS2 (POSIX-compliant script)

ros2-source-aliases-setup.sh

#!/bin/sh

# Define the shell rc (ie. ~/.bashrc or ~/.zshrc)
SHELL_RC="${HOME}/.$(basename ${SHELL})rc"

# Check if SHELL_RC exists, if not, use .profile
if [ ! -f "${SHELL_RC}" ]; then
    echo "${SHELL_RC} not found"
    SHELL_RC="$HOME/.profile"
fi

# Add sr alias to the selected shell rc file
if ! grep -q 'alias sr=' "${SHELL_RC}"; then
    echo 'alias sr="[ -f \"/opt/ros/humble/setup.$(basename $SHELL)\" ] && source \"/opt/ros/humble/setup.$(basename $SHELL)\" || echo \"/opt/ros/humble/setup.$(basename $SHELL) does not exist.\""' >> "${SHELL_RC}"
    echo "alias sr has been added to ${SHELL_RC}"
else
    echo "alias sr already exists in ${SHELL_RC}"
fi

# Add sc alias to the selected shell rc file
if ! grep -q 'alias sc=' "${SHELL_RC}"; then
    echo 'alias sc="[ -f \"install/setup.$(basename $SHELL)\" ] && source \"install/setup.$(basename $SHELL)\" || echo \"install/setup.$(basename $SHELL) does not exist.\""' >> "${SHELL_RC}"
    echo "alias sc has been added to ${SHELL_RC}"
else
    echo "alias sc already exists in ${SHELL_RC}"
fi

# Add slc alias to the selected shell rc file
if ! grep -q 'alias slc=' "${SHELL_RC}"; then
    echo 'alias slc="[ -f \"install/local_setup.$(basename $SHELL)\" ] && source \"install/local_setup.$(basename $SHELL)\" || echo \"install/local_setup.$(basename $SHELL) does not exist.\""' >> "${SHELL_RC}"
    echo "alias slc has been added to ${SHELL_RC}"
else
    echo "alias slc already exists in ${SHELL_RC}"
fi