# Some questions on \`startup.jl\`
**URL:** https://discourse.julialang.org/t/some-questions-on-startup-jl/99752
**Category:** General Usage
**Tags:** question
**Created:** [June 2, 2023, 4:00am UTC](https://discourse.julialang.org/t/some-questions-on-startup-jl/99752 "2023-06-02T04:00:35Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@WuSiren](https://discourse.julialang.org/u/WuSiren)
#### Post date: [June 2, 2023, 4:00am UTC](https://discourse.julialang.org/t/some-questions-on-startup-jl/99752/1 "2023-06-02T04:00:35Z")
I am configuring the automatic start of `OhMyREPL.jl`. The [document](https://docs.juliahub.com/OhMyREPL/08e1i/0.5.22/installation/) advise putting the following code in the `.julia/config/startup.jl` file:
```julia
atreplinit() do repl
try
@eval using OhMyREPL
println("OhMyREPL imported") # I add this line
catch e
@warn "error while importing OhMyREPL" e
end
end
```
Now I have some questions on this code:
1. Why do I have to write the `try...catch...end` code segment into the `atreplinit() do repl...end`?
2. Why do I have to add an `@eval` before `using OhMyREPL` but unnecessarily do that before `println(“OhMyREPL imported”)`?
---
### Author:  [@heliosdrm](https://discourse.julialang.org/u/heliosdrm)
#### Post date: [June 2, 2023, 6:07am UTC](https://discourse.julialang.org/t/some-questions-on-startup-jl/99752/2 "2023-06-02T06:07:20Z")
1. Because it can fail, e.g. if the package is not actually installed.
2. Because all the code between `do ... end` is an anonymous function, and [it is not possible to import modules in a function’s scope](https://discourse.julialang.org/t/why-wont-julia-let-me-put-a-module-import-within-a-function/46504/4). So this is one of those rare cases where it makes sense to use `@eval` inside a function, so that the instruction is executed in the outer scope.
---
### Author:  [@WuSiren](https://discourse.julialang.org/u/WuSiren)
#### Post date: [June 2, 2023, 9:13am UTC](https://discourse.julialang.org/t/some-questions-on-startup-jl/99752/3 "2023-06-02T09:13:11Z")
Thanks for response!
In my first question I actually want to know why is the `atreplinit() do repl ... end` block necessary?
---
### Author:  [@fatteneder](https://discourse.julialang.org/u/fatteneder)
#### Post date: [June 2, 2023, 9:19am UTC](https://discourse.julialang.org/t/some-questions-on-startup-jl/99752/4 "2023-06-02T09:19:50Z")
From the docs
```julia
help?> atreplinit
search: atreplinit
atreplinit(f)
Register a one-argument function to be called before the REPL interface is initialized in interactive sessions; this is useful to customize the interface. The
argument of f is the REPL object. This function should be called from within the .julia/config/startup.jl initialization file.
```
It is added so that `OhMyREPL` is only loaded when running interactively.
If you are using Julia just to run a script once, like `julia compute_something.jl`, then you likely don’t need `OhMyREPL`, so the above prevents that.