姆啾

./bin/hdfs dfs -appendToFile local.txt text.txt./bin/hdfs dfs -copyFromLocal -f local.txt text.txt./bin/hdfs dfs -cp -f file:///home/hadoop/local.txt text.txt

# 追加到原文件末尾cd /usr/local/hadoop./bin/hdfs dfs -appendToFile local.txt text.txt# 覆盖原文件（第一种形式）./bin/hdfs dfs -copyFromLocal -f local.txt text.txt# 覆盖原文件（第二种形式）./bin/hdfs dfs -cp -f file:///home/hadoop/local.txt text.txt# 用if-else自动判断：存在则追加，不存在则覆盖上传if $(hdfs dfs -test -e text.txt);then $(hdfs dfs -appendToFile local.txt text.txt);else $(hdfs dfs -copyFromLocal -f local.txt text.txt);fi

cd /usr/local/hadoop./bin/hdfs dfs -appendToFile local.txt text.txt./bin/hdfs dfs -copyFromLocal -f local.txt text.txt./bin/hdfs dfs -cp -f file:///home/hadoop/local.txt text.txtif $(hdfs dfs -test -e text.txt);then $(hdfs dfs -appendToFile local.txt text.txt);else $(hdfs dfs -copyFromLocal -f local.txt text.txt);fi