cURL Download and Upload Workflows

curl --retry 5 --retry-delay 2 -O https://example.com/archive.tgz

# Retry transient connection and timeout errors.

curl --retry 5 --retry-all-errors -O https://example.com/archive.tgz

# Retry on all errors, including transient HTTP failures when appropriate.

curl -OJ https://example.com/download

# Use server-provided filename from headers.

curl --create-dirs -o downloads/reports/out.pdf https://example.com/report.pdf

# Create local directories automatically for output paths.

curl --limit-rate 500K -O https://example.com/large.bin

# Cap the download or upload speed.

curl --speed-limit 1024 --speed-time 30 -O https://example.com/file.bin

# Abort a transfer if speed drops below a threshold for too long.

curl --config urls.txt

# Use a curl config file to store repeated options and URLs.

curl -O 'https://example.com/{a,b,c}.txt'

# Download several related URLs using brace expansion.

curl -O 'https://example.com/logs/app[1-5].txt'

# Download multiple similarly named files.

printf 'hello
' | curl -T - https://example.com/upload.txt

# Pipe content into curl and upload it as request body.

curl -u user:pass -T ./backup.sql sftp://example.com/home/user/backup.sql

# Transfer a file to an SFTP destination.

curl -u user:pass -T ./site.zip ftp://example.com/incoming/site.zip

# Send a file to an FTP server.

curl --append -T ./log.txt ftp://example.com/log.txt

# Append uploaded data when the protocol and server support it.

curl --url 'smtp://mail.example.com:587' --ssl-reqd --mail-from 'me@example.com' --mail-rcpt 'you@example.com' --upload-file email.txt -u 'me@example.com:password'

# Submit an email message using SMTP.