Other notes
How To Use grep Command In Linux / UNIX With Practical Examples
Source: https://www.cyberciti.biz/faq/howto-use-grep-command-in-linux-unix/
Search any line that contains the word in filename on Linux:
grep 'word' filename
Perform a case-insensitive search for the word ‘bar’ in Linux and Unix:
grep -i 'bar' file1
Look for all files in the current directory and in all of its subdirectories in Linux for the word ‘httpd’:
grep -R 'httpd' .
Search and display the total number of times that the string ‘nixcraft’ appears in a file named frontpage.md:
grep -c 'nixcraft' frontpage.md
curl --help guidance
Usage: curl [options...] <url>
-d, --data <data> HTTP POST data
-f, --fail Fail fast with no output on HTTP errors
-h, --help <category> Get help for commands
-i, --include Include protocol response headers in the output
-o, --output <file> Write to file instead of stdout
-O, --remote-name Write output to a file named as the remote file
-s, --silent Silent mode
-T, --upload-file <file> Transfer local FILE to destination
-u, --user <user:password> Server user and password
-A, --user-agent <name> Send User-Agent <name> to server
-v, --verbose Make the operation more talkative
-V, --version Show version number and quit
This is not the full help, this menu is stripped into categories.
Use "--help category" to get an overview of all categories.
For all options use the manual or "--help all".
Help categories for curl --help <category>
Invalid category provided, here is a list of all categories:
auth Different types of authentication methods
connection Low level networking operations
curl The command line tool itself
dns General DNS options
file FILE protocol options
ftp FTP protocol options
http HTTP and HTTPS protocol options
imap IMAP protocol options
misc Options that don't fit into any other category
output Filesystem output
pop3 POP3 protocol options
post HTTP Post specific options
proxy All options related to proxies
scp SCP protocol options
sftp SFTP protocol options
smtp SMTP protocol options
ssh SSH protocol options
telnet TELNET protocol options
tftp TFTP protocol options
tls All TLS/SSL related options
upload All options for uploads
verbose Options related to any kind of command line output of curl
Help for http protocol
~ $ curl --help http
Usage: curl [options...] <url>
http: HTTP and HTTPS protocol options
--alt-svc <file name> Enable alt-svc with this cache file
--anyauth Pick any authentication method
--aws-sigv4 <provider1[:provider2[:region[:service]]]> Use AWS V4 signature authentication
--compressed Request compressed response
-b, --cookie <data|filename> Send cookies from string/file
-c, --cookie-jar <filename> Write cookies to <filename> after operation
-d, --data <data> HTTP POST data
--data-ascii <data> HTTP POST ASCII data
--data-binary <data> HTTP POST binary data
--data-raw <data> HTTP POST data, '@' allowed
--data-urlencode <data> HTTP POST data URL encoded
--digest Use HTTP Digest Authentication
--disallow-username-in-url Disallow username in URL
-D, --dump-header <filename> Write the received headers to <filename>
--etag-compare <file> Pass an ETag from a file as a custom header
--etag-save <file> Parse ETag from a request and save it to a file
--expect100-timeout <seconds> How long to wait for 100-continue
-f, --fail Fail fast with no output on HTTP errors
--fail-with-body Fail on HTTP errors but save the body
-F, --form <name=content> Specify multipart MIME data
--form-escape Escape multipart form field/file names using backslash
--form-string <name=string> Specify multipart MIME data
-G, --get Put the post data in the URL and use GET
--haproxy-protocol Send HAProxy PROXY protocol v1 header
-I, --head Show document info only
-H, --header <header/@file> Pass custom header(s) to server
--hsts <file name> Enable HSTS with this cache file
--http0.9 Allow HTTP 0.9 responses
-0, --http1.0 Use HTTP 1.0
--http1.1 Use HTTP 1.1
--http2 Use HTTP 2
--http2-prior-knowledge Use HTTP 2 without HTTP/1.1 Upgrade
--http3 Use HTTP v3
--ignore-content-length Ignore the size of the remote resource
--json <data> HTTP POST JSON
-j, --junk-session-cookies Ignore session cookies read from file
-L, --location Follow redirects
--location-trusted Like --location, and send auth to other hosts
--max-redirs <num> Maximum number of redirects allowed
--negotiate Use HTTP Negotiate (SPNEGO) authentication
--no-alpn Disable the ALPN TLS extension
--no-npn Disable the NPN TLS extension
--ntlm Use HTTP NTLM authentication
--ntlm-wb Use HTTP NTLM authentication with winbind
--post301 Do not switch to GET after following a 301
--post302 Do not switch to GET after following a 302
--post303 Do not switch to GET after following a 303
-r, --range <range> Retrieve only the bytes within RANGE
--raw Do HTTP "raw"; no transfer decoding
-e, --referer <URL> Referrer URL
--request-target <path> Specify the target for this request
-z, --time-cond <time> Transfer based on a time condition
--tr-encoding Request compressed transfer encoding
-A, --user-agent <name> Send User-Agent <name> to server
Couldn’t get any requests with JSON data to work
~ $ curl http://localhost:3000/mock --data --json {'text': 0}
zsh: parse error near `}'
~ $ curl http://localhost:3000/mock --json "{'text': '0'}"
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>SyntaxError: Unexpected token ' in JSON at position 1<br> at JSON.parse (<anonymous>)<br> at parse (/Users/arthur/Documents/mockapi/node_modules/body-parser/lib/types/json.js:92:19)<br> at /Users/arthur/Documents/mockapi/node_modules/body-parser/lib/read.js:128:18<br> at AsyncResource.runInAsyncScope (node:async_hooks:202:9)<br> at invokeCallback (/Users/arthur/Documents/mockapi/node_modules/raw-body/index.js:238:16)<br> at done (/Users/arthur/Documents/mockapi/node_modules/raw-body/index.js:227:7)<br> at IncomingMessage.onEnd (/Users/arthur/Documents/mockapi/node_modules/raw-body/index.js:287:7)<br> at IncomingMessage.emit (node:events:527:28)<br> at endReadableNT (node:internal/streams/readable:1344:12)<br> at process.processTicksAndRejections (node:internal/process/task_queues:82:21)</pre>
</body>
</html>
Incomplete JSON data seems to work:
~ $ curl --json {} http://localhost:3000/mock/echo
{}%
Infura example curl request with JSON data
curl https://mainnet.infura.io/v3/YOUR-API-KEY \
-X POST \
-H "Content-Type: application/json" \
--data '{"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber", "params": []}'