I this article I am going to show how you can write your own custom command in terminal. For the purpose of explanation I am going to show how you can build any run a C++ File with just a single command .
First check if you have intsall the g++ compiler in your computer or not, to check it run this command, it will show the version of your g++ compiler. If it shows you ther version you are ready to go.
g++ --version
Open your Terminal App in Mac, and type cd
this will bring you ~
or /Users/YourUserName
folder.
In this folder you need to make a new file in which you want to write the command . For this example I am giving the file name .custom_command.sh
, now let us understand the file name as you can see I have given a .
in-front of the file name, dot will hide the file and save from accidental delete. In place of custom_command
you can give any file name and the file ends with the extension .sh
which is shell script.
This command will make the file.
touch .custom_command.sh
Now, We need to write the Script inside this file, open the file with vim.
vim .custom_command.sh
Now press I
on vim and copy the code below and paste it in the file. After you have pasted the code hit esc
and write :wq
and hit enter this will save the file changes.
#!/bin/bash
function run(){
if g++ -std=c++20 $1 -o runed; then
./runed
else
echo 'Error in '$1
fi
}
Code Explanation
First Line #!/bin/bash
says that with which we need interact, I our case we are interacting with the bash.
Second we have made a function with the name of run
this is the command with which we will compile and run the c++ file at the same time. For an example we have a C++ file name print_helloworld.cpp which output HelloWorld!
, first we need to compile it and then run it but with the custom command we can do the both with just one command.
run print_helloworld.cpp
You can give your own function name, replace the run
with your own desired word in the .custom_command.sh
file, for an example if your replace the run
with runcpp
than you need to type the below code to run the C++ file.
runcpp print_helloworld.cpp
Now Coming on the third line, as you can see the code if inside if loop ( the loop basically says if the file compile then run the compiled code or else print a error message ). We need to see the line which says g++ -std=c++20 $1 -o runed
this mean that we are using a g++ compiler to compile our c++ code and we are using c++ version 20 '-std=c++20' after which we are taking an input $1
which is the file name and creating a new file -o runed
in which we will have our complied code.
If the file compiled successfully then it will run the code with the line ./runned
.
Back to Setup
After you have successfully made the file .custom_command.sh
open ~/.bashrc with vim if you use Bash or ~/.zshrc if you use ZSH and paste the below command at the last, this will allow to run your command from any session or terminal window.
source ~/.custom_command.sh
Notice : If you have changed the file name in which you have written the custom command then replace the
.custom_command.sh
with your file name.
Now hit esc
and then type :wq
and then hit enter. The file has been saved. Now restart you terminal.
Test The Command
run print_helloworld.cpp
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