Curl duplicate file download if file exist

 · Step 1 — Fetching remote files. Out of the box, without any command-line arguments, the curl command will fetch a file and display its contents to the standard output. Let’s give it a try by downloading the bltadwin.ru file from bltadwin.ru: You’ll see the file’s contents displayed on the screen: Give curl a URL and it will fetch Estimated Reading Time: 4 mins. If you don't want to terminate the script at that point: if [ -e "filename" ]; then echo 'File already exists' 2 else curl -o "filename" "URL" fi. The test will be true if the name exists, regardless of whether the name is that of a regular file, directory, named pipe or other Reviews: 2.  · Use Curl to check if a remote resource, regardless of whether the remote resource is an image, tarball (or other compressed files), text file, or whatever you’re after, is available before attempting to download it. Curl’s man page contains a wealth of information, which just goes to show that the old adage of “search, and you shall find.

The Chrome extension Downloads Overwrite Already Existing Files prevents duplicate file downloads in Chrome by overwriting files if they exist in the selected download folder. So, instead of ending up with duplicate files ending with (1), (2) and so on, you end up with a single file. The extension will overwrite files with identical names even. Typically, curl will automatically extract the public key from the private key file, but in cases where curl does not have the proper library support, a matching public key file must be specified using the --pubkey option. This small and lightweight extension helps you to avoid these duplicate downloads and can even save you some bandwidth. When initiating a download the extension will check if the file already exists. If it does exist, you will be provided with a few options whether you want to download it anyway or open the already existing file.

Well, file_exists does not say if a file exists, it says if a path exists. ⚡⚡⚡⚡⚡⚡⚡ So, to check if it is a file then you should use is_file together with file_exists to know if there is really a file behind the path, otherwise file_exists will return true for any existing path. This option is used to resume a broken download, but will skip the download if the file is already complete. Note that the argument to -C is a single dash. A disadvantage might be that curl still briefly contacts the remote server to ask for the file size. In certain cases, the local file will be clobbered, or overwritten, upon repeated download. In other cases it will be preserved. When -nc option is specified, Wget will refuse to download copies of the same file. If you had the same file that wget tries to download, it will refuse to download it unless you rename or remove the local file.