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    <pre><code>The check_basic_env.sh Script #! /bin/sh # This block is trying to do the basics of checking to see if # the HADOOP_HOME and the JAVA_HOME variables have been set correctly # and if they are not been set, suggest a setting in line with the earlier examples # The script actually tests for: # the presence of the java binary and the hadoop script, # and verifies that the expected versions are present # that the version of java and hadoop is as expected (warning if not) # that the version of java and hadoop referred to by the # JAVA_HOME and HADOOP_HOME environment variables are default version to run. # # # The 'if [' construct you see is a shortcut for 'if test' .... # the -z tests for a zero length string # the -d tests for a directory # the -x tests for the execute bit # -eq tests numbers # = tests strings # man test will describe all of the options # The '1&gt;&amp;2' construct directs the standard output of the # command to the standard error stream. if [ -z "$HADOOP_HOME" ]; then echo "The HADOOP_HOME environment variable is not set" 1&gt;&amp;2 if [ -d ~/src/hadoop-0.19.0 ]; then echo "Try export HADOOP_HOME=~/src/hadoop-0.19.0" 1&gt;&amp;2 fi exit 1; fi # This block is trying to do the basics of checking to see if # the JAVA_HOME variable has been set # and if it hasn't been set, suggest a setting in line with the earlier examples if [ -z "$JAVA_HOME" ]; then echo "The JAVA HOME environment variable is not set" 1&gt;&amp;2 if [ -d /usr/java/jdk1.6.0_07 ]; then echo "Try export JAVA_HOME=/usr/java/jdk1.6.0_07" 1&gt;&amp;2 fi exit 1 fi # We are now going to see if a java program and hadoop programs # are in the path, and if they are the ones we are expecting. # The which command returns the full path to the first instance # of the program in the PATH environment variable # JAVA_BIN=`which java` HADOOP_BIN=`which hadoop` # Check for the presence of java in the path and suggest an # appropriate path setting if java is not found if [ -z "${JAVA_BIN}" ]; then echo "The java binary was not found using your PATH settings" 1&gt;&amp;2 if [ -x ${JAVA_HOME}/bin/java ]; then echo 'Try export PATH=${JAVA_HOME}/bin' 1&gt;&amp;2 fi exit 1 fi # Check for the presence of hadoop in the path and suggest an # appropriate path setting if java is not found if [ -z "${HADOOP_BIN}" ]; then echo "The hadoop binary was not found using your PATH settings" 1&gt;&amp;2 if [ -x ${HADOOP_HOME}/bin/hadoop ]; then echo 'Try export PATH=${HADOOP_HOME}/bin:${PATH}' 1&gt;&amp;2 fi exit 1 fi # Double check that the version of java installed in ${JAVA_HOME} # is the one stated in the examples. # If you have installed a different version your results may vary. # if ! ${JAVA_HOME}/bin/java -version 2&gt;&amp;1 | grep -q 1.6.0_07; then (echo –n "Your JAVA_HOME version of java is not the" echo –n " 1.6.0_07 version, your results may vary from" echo " the book examples.") 1&gt;&amp;2 fi # Double check that the java in the PATH is the expected version. if ! java -version 2&gt;&amp;1 | grep -q 1.6.0_07; then (echo –n "Your default java version is not the 1.6.0_07 " echo –n "version, your results may vary from the book" echo " examples.") 1&gt;&amp;2 fi # Try to get the location of the hadoop core jar file # This is used to verify the version of hadoop installed HADOOP_JAR=`ls -1 ${HADOOP_HOME}/hadoop-0.19.0-core.jar` HADOOP_ALT_JAR=`ls -1 ${HADOOP_HOME}/hadoop-*-core.jar` # If a hadoop jar was not found, either the installation # was incorrect or a different version installed if [ -z "${HADOOP_JAR}" -a -z "${HADOOP_ALT_JAR}" ]; then (echo –n "Your HADOOP_HOME does not provide a hadoop" echo –n " core jar. Your installation probably needs" echo –n " to be redone or the HADOOP_HOME environment" echo variable needs to be correctly set.") 1&gt;&amp;2 exit 1 fi if [ -z "${HADOOP_JAR}" -a ! -z "${HADOOP_ALT_JAR}" ]; then (echo –n "Your hadoop version appears to be different" echo –n " than the 0.19.0 version, your results may vary" echo " from the book examples.") 1&gt;&amp;2 fi if [ `pwd` != ${HADOOP_HOME} ]; then (echo –n 'Please change your working directory to" echo –n " ${HADOOP_HOME}. cd ${HADOOP_HOME} &lt;Enter&gt;") 1&gt;&amp;2 exit 1 fi echo "You are good to go" echo –n "your JAVA_HOME is set to ${JAVA_HOME} which " echo "appears to exist and be the right version for the examples." echo –n "your HADOOP_HOME is set to ${HADOOP_HOME} which " echo "appears to exist and be the right version for the examples." echo "your java program is the one in ${JAVA_HOME}" echo "your hadoop program is the one in ${HADOOP_HOME}" echo –n "The shell current working directory is ${HADOOP_HOME} " echo "as the examples require." if [ "${JAVA_BIN}" = "${JAVA_HOME}/bin/java" ]; then echo "Your PATH appears to have the JAVA_HOME java program as the default java." else echo –n "Your PATH does not appear to provide the JAVA_HOME" echo " java program as the default java." fi if [ "${HADOOP_BIN}" = "${HADOOP_HOME}/bin/hadoop" ]; then echo –n "Your PATH appears to have the HADOOP_HOME" echo " hadoop program as the default hadoop." else echo –n "Your PATH does not appear to provide the the HADOOP_HOME " echo "hadoop program as the default hadoop program." fi exit 0 </code></pre> <p>This script will help you to check all your env variables and configs. Try this bash script, by storing it hadoop root directory. Run it by simply writing ./check_basic_env.sh .</p>
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