Bash script for file transfer via SFTP

copy_file.sh

#!/bin/bash

# Copyright © Sixtus Agbo
# Bash script for file transfer via SFTP
# Usage: ./copy_file.sh <local_file_path> [remote_filename]

# Default values
REMOTE_USER="foo_remote_user"
REMOTE_HOST="foo.server"
REMOTE_PATH="/home/foo/bar"
SSH_KEY="~/.ssh/foo"

function show_usage() {
    echo "Usage: $0 <local_file_path> [remote_filename]"
    echo "  <local_file_path>: Path to the file you want to upload"
    echo "  [remote_filename]: Optional name for the file at destination (defaults to original filename)"
    exit 1
}

# Check if at least one argument is provided
if [ $# -lt 1 ]; then
    echo "Error: Missing file to transfer!"
    show_usage
fi

# Define local file path from argument
LOCAL_FILE_PATH="$1"

# Check if local file exists
if [ ! -f "$LOCAL_FILE_PATH" ]; then
    echo "Error: Local file '$LOCAL_FILE_PATH' not found!"
    exit 1
fi

# Extract filename from path and determine remote filename
ORIGINAL_FILENAME=$(basename "$LOCAL_FILE_PATH")
REMOTE_FILENAME="${2:-$ORIGINAL_FILENAME}"

echo "Uploading file: $LOCAL_FILE_PATH → $REMOTE_PATH/$REMOTE_FILENAME"

# Use SFTP to transfer file (assuming directory already exists!)
sftp -i "$SSH_KEY" "$REMOTE_USER@$REMOTE_HOST" <<EOF
put "$LOCAL_FILE_PATH" "$REMOTE_PATH/$REMOTE_FILENAME"
quit
EOF

# Verify the file was copied successfully
if [ $? -eq 0 ]; then
    echo "[SUCCESS] File has been uploaded to $REMOTE_HOST:$REMOTE_PATH/$REMOTE_FILENAME"
    exit 0
else
    echo "[ERROR] Failed to upload file!"
    exit 1
fi