Managing files and file permissions – previewing data in HDFS

Let us see how we can preview the data in HDFS.

  • If we are dealing with files contain text data (files of text file format), we can preview contents of the files using different commands as -tail, -cat etc.
    • -tail can be used to preview last 1 KB of the file
    • -cat can be used to print the whole contents of the file on the screen. Be careful while using -cat as it will take a while for even medium sized files.
    • If you want to get first few lines from file you can redirect output of hadoop fs -cat to Linux more command

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