How can i output commands from a bash script to another shell (python,root)?

Question

i want to open a shell of a different program from the bash script (specifically root - a software for physicists) and execute several commands in a row.

I know to enter one command:

echo ".L mymacro.C" | root -l  

but i need to enter several commands one by one without closing the root shell (root is not a root user, but an interactive shell for a different program)

I have tried with the parentheses, but it didn't succeed:

(echo ".L mymacro.C"; echo "myClass a";echo "a.Loop") | root -l

I need those 3 commands entered in a root shell one by one:

mymacro.C
myClass a
a.Loop

How could i do this from a bash script?

Thank you very much.

Answer 1

Perhaps a here document might work:

$ root -l <<EOF
.L mymacro.C
myClass a
a.Loop
EOF

Answer 2

Can you not simply do:

echo -e ".L mymacro.C\nmyClass a\na.Loop" | root -l

This will send the data line by line to the root shell.

Or if you really want to do it one by one, you can always loop as follows:

Code removed thanks to mhawke's remark