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The link to download log4j is here. However I have logged into the my EC2 instance. Whats the command line to download this log4j ?

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Try using wget to download the file:

wget http://www.eu.apache.org/dist/logging/log4j/1.2.17/log4j-1.2.17.tar.gz

You can change the eu to us in the URL to use the US mirror.

Also, consider using your package manager to install log4j instead; unless you have a specific requirement to download and install manually.

You've not mentioned which Linux distro you're running, but I know lib4j is available on Ubuntu and RedHat/CentOS.

For Ubuntu:

$ sudo apt-get install log4j

For RedHat/CentOS:

$ sudo yum install log4j

Change log4j to log4j-manual and/or log4j-javadoc in the commands above for the developer manual and API documentation respectively.

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For Ubuntu, the package name is liblog4j2-java, so to install it using apt-get would be:

$ sudo apt-get install liblog4j2-java

For RedHat/CentOS as said in other answers would be:

$ sudo yum install log4j

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