Edit

C

Cat

Add many lines to a file

cat > file.txt << EOF
Line 1
Line 2
EOF

Curl

Options

  • -X: Method GET, POST, etc

  • -F or –form: Form data

  • -v: verbose

  • -u: username:password

  • -k, –insecure: allow insecure connection

  • -d, --data:

    • @, the rest should be a file name to read the data from: e.g. -d @filename

    • -: data is from stdin

    • When -d, --data is told to read from a file, carriage returns and newlines will be stripped out. => @ character has a special interpretation use --data-raw instead

  • o filename: save output to filename

  • O: save output with its original filename

Upload file using Post

  • curl -X POST -F "file=@./file.txt" -F "key=" https://website.com/uploader

  • curl -d @data.txt -X POST http://example.com/upload

  • curl -X POST -F "content=Here is a text file upload" -F "[email protected]" https://discord.com/api/webhooks/1781574/wMt6zP

Send form data

  • curl -d "username=user1&password=pass123" -X POST http://example.com/login: submit login form with credential

Send Json data

  • curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" -X POST http://example.com/api

Send URL-encoded data

  • curl -d "field1=value1&field2=value2" -H "Content-Type: application/x-www-form-urlencoded" -X POST http://example.com/form

Download file

  • curl -O http://releases.ubuntu.com/18.04/ubuntu-18.04-live-server-amd64.iso

  • curl -C - -O http://releases.ubuntu.com/18.04/ubuntu-18.04-live-server-amd64.iso: Resume dropped connection

  • curl --limit-rate 1m -O http://releases.ubuntu.com/18.04/ubuntu-18.04-live-server-amd64.iso: limit speed to 1 mb, other suffix is k for kilobytes, g for gigabytes

  • curl -# -O http://releases.ubuntu.com/18.04/ubuntu-18.04-live-server-amd64.iso: display download status progress bar

Upload file via FTP

  • curl -T newfile.tar.gz -u FTP_USERNAME:FTP_PASSWORD ftp://ftp.example.com/

    • -T: remote file name is the original filename

  • curl -T newfile.tar.gz -u FTP_USERNAME:FTP_PASSWORD -k sftp://ftp.example.com/: using sftp

Delete file from FTP Server

  • curl ftp://ftp.example.com/ -X 'DELE file.txt' -u FTP_USERNAME:FTP_PASSWORD

Post data to influxdb via api

  • curl -i -XPOST 'http://localhost:8086/write?db=telegraf' --data-binary 'cpu_load_short,host=server01 value=0.64'

    • -i, --include: Include protocol response headers in the output

Delete file from ftp server

Basic Authentication

  • curl -u "username:password" url

Using a proxy

  • curl --proxy socks5://127.0.0.1:8080 checkip.dyndns.org

  • curl -x socks5://127.0.0.1:8080 checkip.dyndns.org

  • curl --proxy-ntlm --proxy "http://$user:[email protected]:8080 checkip.dyndns.org: NTLM Auth with Proxy

Timing with Curl

  • curl -w "dnslookup: %{time_namelookup} | connect: %{time_connect} | appconnect: %{time_appconnect} | pretransfer: %{time_pretransfer} | starttransfer: %{time_starttransfer} | total: %{time_total} | size: %{size_download}\n" -so /dev/null https://site.com

Getting Definition of a word using DICT Protocol

  • curl dict://dict.org/d:computer

  • curl dict://dict.org/show:db: list available dictionaries

Reference

  • https://davidwalsh.name/curl-post-file

  • https://medium.com/@petehouston/upload-files-with-curl-93064dcccc76

  • https://kb.fortinet.com/kb/documentLink.do?externalID=FD37759

  • https://blog.cloudflare.com/a-question-of-timing/

  • Curl command with Examples

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