Use 'git status' to upload files that have modified.

scp_upload.sh

#!/bin/bash
local_path='Your local path' # ex: /home/your_projects/test
remote_path='Your cloud path' # ex: /var/www/api
remote_con='Your ssh connection' # ex: [email protected]
# Get the content in 'src/', because I only need to upload the content of 'src/' folder.
for file in $(git status --porcelain | grep "src/")
do
    file_name=${file/'^M$'/} # Get to a Modified file.
    local_file="$local_path$file_name"
    remote_file="$remote_path$file_name"
    if [ -f "$local_file" ]
    then
        scp $local_file $remote_con:$remote_file
        # Show the file's name in the terminal.
        echo "$local_file-->$remote_file"
    fi
done