Course of Raku / Objects, I/O, and exceptions / Input and output / Running external programs 🆕 / Exercises

Pass a variable to a child

Problem

Create a file notes.txt and write a few lines into it. Put its name into an environment variable NOTES. Then use shell to run wc -l, reading the file name from $NOTES, so the child counts the lines and prints the number. Finally, delete the file from Raku — with unlink, not through the shell.

Example

The program prints:

3

(and leaves no notes.txt behind.)

Solution

✅ See the solution

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