Escape single quote within double quote within single quote

 

This question already has an answer here:

  • How to escape single quotes within single quoted strings? 19 answers

    • A simple advice: when in doubt and no special needs that force you to use both single and double quotes, just normalize the quotes and escape the inner ones: 

    curl -X POST --data-urlencode "payload={"channel": "@somebody", "text": "I'm sending you a test message. Let me know if you get it."}" https://hooks.slack.com/services/XXX

    It's cleaner and intuitive.

    If you want to really escape the single quote inside double quotes: 

     curl -X POST --data-urlencode 'payload={"channel": "@somebody", "text": "I'''m sending you a test message. Let me know if you get it."}' https://hooks.slack.com/services/XXX

    Without any escaping etc you can use here-doc and pass it to your curl command: 

    cat<<-'EOF' | curl -X POST --data-urlencode @- https://hooks.slack.com/services/XXX
payload={"channel": "@somebody", "text": "I'm sending you a test message. Let me know if you get it."}
EOF

    Here @- will make curl read data from stdin.

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