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I'm trying to copy a file only if it already exists, not if it doesn't, basically overwrite only on Linux. Does anyone know a solution?

I basically need to "look" for a folder then if a file exists, it overwrites in destination (recursive)

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Although there's a small race condition you could use something like this:

src=from.txt
dst=to.txt

[[ -f "$dst" ]] && cp -fp "$src" "$dst"

The [[ ... ]] operations checks to to see if the file already exists, and if it does the && allows the copy to proceed.

If you have rsync you can do it directly (the --existing flag tells rsync only to update files that already exist):

rsync --existing --archive "$src" "$dst"
-4
\cp -rf source destination

overwrites if file exists without confirmation

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    It will also copy the file if the target doesn't exist, which is what the OP wants to avoid. – xenoid May 16 at 15:15
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    This is an incorrect answer to the question the OP has asked. – 0xSheepdog May 16 at 15:20
  • the source must be fresh >filelist.txt. that kind of blind copy/sync is incorrect. – studen May 26 at 13:14

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