Setting Java Home in Ubuntu 20

Setting Java Home in Ubuntu 20

Linux Syed Ghouse Habib   March 11, 2021

1.Open Terminal Using the command ctr+alt+T

2.Type the Command 'sudo -H gedit /etc/profile' 

3.Separate Window Opens up there add the following

JAVA_HOME=/opt/java/jre1.8.0_281/bin
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

4.In JAVA_HOME point it to the directory where you have extracted the Java.Save it and close the window.

5.Logout and Login again now test the java home using the echo $JAVA_HOME

Happy Learning.!!!!

Unexpected token Error During Ant Build

Unexpected token Error During Ant Build

Linux Syed Ghouse Habib   August 16, 2020

Today I was facing the Strange Error, Which I have not Faced earlier. 

Error Log:

$ ./cant create-ear

./cant: line 2: $'\r': command not found

./cant: line 4: $'\r': command not found

 create-ear

./cant: line 32: syntax error near unexpected token `elif'

'/cant: line 32: `elif [ "$system" = "Linux" ];then

Later Investigating it Found the Issue with the File System. Hence Googled it and Found the Solution. The Solution is First Identify which Machine are you using, ie Linux or Windows. Then Procced to the Solution

Cause:

In My case, I was using the Linux Machine and trying to execute the File Saved in Windows.

Solution:

To Fix this Open the File in Notepad ++ and Navigate to EDIT>EOL Conversion

Select Unix(LF) Conversion If you need to execute it in the Linux Environment.

Select Windows (CR LF) In case you need to execute in Windows Environment.

Select Macintosh (CR) In Case of Mac.

This Solution is not Specific to ant alone, can be used for other files as well.

Happy Learning !!!

Clearing Cache In Linux

Clearing Cache In Linux

Linux Syed Ghouse Habib   August 06, 2017

Hi All,
         Today, I was Facing error with Respect to the Memory , Though I have Enough Memory in my Machine, it's not Clearing out . 

How I identified this 

1) Executed the Command free -m 

this will give the Free Memory Report in the Linux Box.

2) I am Running only one Instance but taking lot of memory ,it  has not cleared the Cache Memory this can be cleared out by the Below Command .

 #!/bin/sh
sync; echo 3 > /proc/sys/vm/drop_caches

Make Sure you are running as the Root Before Executing this.

Happy Learning !!!!