On 08/31/2010 03:12 PM, Gang Luo wrote: > Thanks Edward. > > I was thinking is the home directory on HDFS also comply with the linux > system? > Since I create '/usr/research/home/smith' on HDFS for user 'smith', which is > also the home directory for smith in linux. When he input ' 'bin/hadoop fs -ls > ~/' he will get this directory, instead of '/user/smith'. > > -Gang
The tilde character '~' is a shell metacharacter. It is converted to value of $HOME before the shell invokes the bin/hadoop command. For example: 1) User types "bin/hadoop fs -ls ~/" 2) Your shell changes this command to "bin/hadoop fs -ls /user/smith/" (or wherever the user's local linux home directory is located). 3) Your shell invokes the command and hadoop returns the contents of '/usr/research/home/smith' from hdfs (which probably doesn't exist), not from the local filesystem. Hadoop doesn't do anything special with the ~ character. --Mike
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