shell学习记录

shell学习

https://www.cnblogs.com/yangyanfei/p/6386831.html

使用shell执行hadoop命令

https://www.cnblogs.com/xyliao/p/5711768.html

./bin/hadoop jar ./myapp/HDFSExample.jar

 

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假设保存为test.sh,java文件为wc.java,【注：会打包成1.jar】,main函数所在类为wc,hdfs上输入目录地址为input，hdfs上输出目录地址为output【注：输入目录和输出目录非必须】

运行程序：

./test.sh wc.java wc input output

#!/bin/bash
#echo "$# $0 $1 $2"
HH=$Hadoop_HOME

if [ $# -lt 2 ];then
    echo "usage: jc.sh source.java ClassName [InputFile] [OutputFile]"
    exit 0
elif [ ${1##*.} != "java" ];then
    echo "Notice: source.java java!"
    exit 0
else
rm -r ./classes/*
javac -classpath $HH/hadoop-mapred-0.22.0.jar:$HH/hadoop-hdfs-0.22.0.jar:$HH/hadoop-common-0.22.0.jar:$HH/lib/commons-cli-1.2.jar -d classes ./$1
jar -cvf 1.jar -C classes/ .
echo "==============Output====================="
if [ $# -eq 2 ];then
        hadoop jar 1.jar $2
elif [ $# -eq 3 ];then
        hadoop jar 1.jar $2 $3
elif [ $# -eq 4 ];then
        hadoop jar 1.jar $2 $3 $4
fi
echo "========================================="
rm 1.jar
fi

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