awk-new-variable.sh

#!/bin/bash

VARIABLE_NAME="NODE_VERSION"
VARIABLE_VALUE="21.7.1"
PROFILE_FILE="$HOME/.bash_profile"

# Check and append using awk
if ! awk -v var="$VARIABLE_NAME" 'BEGIN { found=0 } /^export/ { if ($0 ~ "export " var "=") found=1 } END { exit !found }' "$PROFILE_FILE"; then
    echo "export $VARIABLE_NAME='$VARIABLE_VALUE'" >> "$PROFILE_FILE"
    echo "Variable $VARIABLE_NAME added to $PROFILE_FILE"
else
    echo "Variable $VARIABLE_NAME already exists in $PROFILE_FILE"
fi