Is it possible to find out the file is already uploaded to IPFS?

Help IPFS
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1

I have (sample.pdf) PDF and I uploaded it to IPFS and my CID is xaxaxaxaxax****xaxa.

Now, If I upload the same file (sample.pdf) with the same name or a different name to IPFS it will upload, and as result, I get the same CID

But I would like to know before uploading the file
Is there any possible way to find out that sample.pdf is already uploaded?

2

Here is an example of how to check from the CLI:

> echo "this is a test zzz" | ipfs add -n                
added QmV7MG3Sd654tXKtMNpxFxudgbGFhAuYkaQiyovdx8ZFFn QmV7MG3Sd654tXKtMNpxFxudgbGFhAuYkaQiyovdx8ZFFn
 19 B / 19 B [==========================================================================================] 100.00%
> ipfs cat QmV7MG3Sd654tXKtMNpxFxudgbGFhAuYkaQiyovdx8ZFFn

In this case, it doesn’t find it because it doesn’t already exist.

3

@ylempereur
ipfs cat CID

the above command is to display the content respective to the CID
But when I’m uploading the duplicate content I won’t be having the CID of the previous one.

So, how can i verify ?

4

He he, you missed the point entirely. What I was teaching you was how to get the CID of a file you want to add without actually adding it. That’s what the “-n” does when using ipfs add. Once you have the CID, there are many commands that let you test/retrieve it if it exists. The most efficient would be ipfs object stat CID.

5

@ylempereur
My bad

Anyways lemme try and get back to you if I need any more help.