下面是一个用于执行SVN更新和上线管理的简单shell脚本示例。此脚本假设您已经在服务器上检出了代码，并且已经配置了SVN。

```bash
#!/bin/bash
# Shell script to update source code and manage deployment using SVN

# Set variables
BASE_DIR="/path/to/your/project"
SVN_REMOTE_REPOSITORY="https://your-svn-repository-url.com/project/trunk"
SVN_USERNAME="your_svn_username"
SVN_PASSWORD="your_svn_password"
LOCK_FILE="${BASE_DIR}/.deploy_lock"

# Check if the lock file exists
if [ -f "$LOCK_FILE" ]; then
   date +"%Y-%m-%d %T: Deployment in progress. Exiting."
   exit 1
else
   date +"%Y-%m-%d %T: No ongoing deployment. Proceeding."
fi

# Set lock file
touch $LOCK_FILE
trap 'rm -f $LOCK_FILE' EXIT

# Enter the base directory
cd $BASE_DIR || exit 1

# Update source code to the latest revision
echo "Updating source code to the latest revision..."
svn update --username $SVN_USERNAME --password $SVN_PASSWORD --non-interactive --trust-server-cert

# Check for any possible conflicts and handle them if any
CONFLICTS=$(svn status | grep -E '^C|^!|^M')
if [ -n "$CONFLICTS" ]; then
   echo "Conflicts found:"
   echo "$CONFLICTS"
   echo "Manually resolve conflicts before deploying again. Exiting."
   exit 1
else
   echo "No conflicts found. Continuing with deployment."
fi

# Perform deployment steps such as building, restarting services, etc.
echo "Performing build and deployment steps..."
# Add custom deployment steps here

date +"%Y-%m-%d %T: Deployment completed successfully."
```

注意：在使用此脚本之前，请确保将所有的占位符（例如脚本中的`SVN_USERNAME`,`SVN_PASSWORD`, `SVN_REMOTE_REPOSITORY`和`BASE_DIR`等）替换为实际的值。此外，根据实际需求，您可能需要按照您的项目要求添加自定义的部署步骤（例如编译应用程序、重启服务等）。

在使用此脚本时，它将尝试从SVN服务器更新代码、检查冲突并执行任何其他部署任务。在部署过程中，如果检测到冲突，则需要手动解决冲突并重新运行部署脚本。