Starting with Julia REPL

We have already learned how to start the Julia REPL and evaluate basic statements in it.

There are various options provided by Julia for running the program. We can directly run statements without even opening the REPL:

$ julia -e 'println("Hello World")'
Hello World

We can even run a loop without starting the REPL:

$ julia -e 'for i=1:5; println("Hello World"); end'
Hello World
Hello World
…

It is also possible to pass arguments:

$ julia -e 'for i in ARGS; println(i); end' k2so r2d2 c3po r4 bb8
k2so
r2d2
c3po
r4
bb8

ARGS is used to take command-line arguments to the script.

We can find the different options that Julia supports using the --help option:

$ julia --help

julia [switches] -- [programfile] [args...]
-v, --version             Display version information
-h, --help                Print this message
-H, --home <dir>          Set location of `julia` executable
-e, --eval <expr>         Evaluate <expr>
-E, --print <expr>        Evaluate and...