How to create a shell script which can create a .java file on executing?

Question

The requirement is to create a shell script that can create a FileName.java file where FileName would be the parameter passed to the script while running the script.

Example:

$ ./shellscript.sh Sample

On executing the above command, a file Sample.java should get created with content:

class Sample{
   public static void main(String[] args){
      for(int i=0;i<10;i++){
      System.out.println("Hello World !!!"); 
   }
}

If sources for learning bash scripting is added in the answer it would be very helpful.

See: tldp.org/LDP/abs/html

stark
– stark

2020-06-10 14:10:28 +00:00
Commented Jun 10, 2020 at 14:10 — stark
– stark, Commented Jun 10, 2020 at 14:10
Thank you @stark, will definitely check

FreudK
– FreudK

2020-06-10 14:12:05 +00:00
Commented Jun 10, 2020 at 14:12 — FreudK
– FreudK, Commented Jun 10, 2020 at 14:12

JRichardsz · Accepted Answer · 2020-06-10 13:39:54Z

1

You just need to make a "template", something like:

classTemplate.txt

class #ClassName{
   public static void main(String[] args){
      for(int i=0;i<10;i++){
      System.out.println("Hello World !!!"); 
   }
}

After that, you just need to replace #ClassName with your parameter

#create .java file
cp classTemplate.txt classTemplate.java 
#set class name
sed -i 's/#ClassName/MyClass/g' classTemplate.java

answered Jun 10, 2020 at 13:39

JRichardsz

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stark · Accepted Answer · 2020-06-10 13:54:58Z

0

Here-docs will expand variables, so

NAME=$1
cat << EOF > $NAME.java
class $NAME{
   public static void main(String[] args){
      for(int i=0;i<10;i++){
      System.out.println("Hello World !!!"); 
   }
}
EOF

answered Jun 10, 2020 at 13:54

stark

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Comments

macdays · Accepted Answer · 2020-06-10 16:37:51Z

0

The following book is a good reference:

https://www.amazon.com/Bash-Pocket-Reference-Power-Admins/dp/1491941596

I would just continue to use stackoverflow and google. This is what has helped me most, since I can search for specific solutions to what I am trying to do. In stackoverflow, you can also run your code and proposed solution by other people and find improved solutions. This is extremely valuable.

answered Jun 10, 2020 at 16:37

macdays

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