# To get documentation for a command
**URL:** https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808
**Category:** New to Julia
**Created:** [June 20, 2018, 6:05am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808 "2018-06-20T06:05:56Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [June 20, 2018, 6:05am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/1 "2018-06-20T06:05:56Z")
I tried
?println
as mentioned [here](https://github.com/xorJane/Introduction_to_Julia_tutorials/blob/master/%201.%20Getting%20started.ipynb).
I am getting an error as “UndefVarError: ? not defined”
---
### Author:  [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [June 20, 2018, 6:42am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/2 "2018-06-20T06:42:35Z")
Where did you try this? Can you copy-paste your input and output? This is what I get in the Julia REPL:
```julia
help?> println
search: println printstyled print_with_color print print_shortest sprint isprint
println([io::IO], xs...)
Print (using print) xs followed by a newline. If io is not supplied, prints to stdout.
Examples
≡≡≡≡≡≡≡≡≡≡
julia> println("Hello, world")
Hello, world
julia> io = IOBuffer();
julia> println(io, "Hello, world")
julia> String(take!(io))
"Hello, world\n"
```
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [July 8, 2018, 12:57am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/3 "2018-07-08T00:57:06Z")
Hi, thanks for the reply. I had tried it on IJulia
```julia
?println
```
Result
> UndefVarError: ? not defined
---
### Author:  [@dpsanders](https://discourse.julialang.org/u/dpsanders)
#### Post date: [July 8, 2018, 1:56am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/4 "2018-07-08T01:56:11Z")
That should work in the Jupyter notebook. Can you provide a screenshot?
---
### Author:  [@microlifecc](https://discourse.julialang.org/u/microlifecc)
#### Post date: [July 8, 2018, 2:14am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/5 "2018-07-08T02:14:11Z")
Hi thanks for the reply.
Can check [here](https://github.com/SubhankarGhosh/Julia-Tutorials/blob/master/Introduction%20to%20Julia(Jane%20Herriman)/1.%20Getting%20started.ipynb) as well.
---
### Author:  [@rdeits](https://discourse.julialang.org/u/rdeits)
#### Post date: [July 8, 2018, 3:11am UTC](https://discourse.julialang.org/t/to-get-documentation-for-a-command/11808/6 "2018-07-08T03:11:17Z")
Ah, yeah, I can reproduce that. Removing the first line (the `#To get docs` comment) fixes the issue. To use the help lookup, the `?` character needs to be the very first thing in the cell.
You can get the same problem at the REPL:
```julia
julia> # This is a comment
?println
ERROR: UndefVarError: ? not defined
```
(note that I had to press alt-enter after the comment line to get a new line without executing anything)