Nushell

Help

A good way to become familiar with all that nu has to offer is by utilizing the help command.

How to see all supported commands:

> help commands | where command_type != builtin | first 10 | drop column 2

Output

───┬─────────────────────┬──────────┬──────────────┬───────────────────────────────────────────────────────────────────────
 # │        name         │ category │ command_type │                                 usage                                 
───┼─────────────────────┼──────────┼──────────────┼───────────────────────────────────────────────────────────────────────
 0 │ alias               │ core     │ keyword      │ Alias a command (with optional flags) to a new name                   
 1 │ break               │ core     │ keyword      │ Break a loop                                                          
 2 │ continue            │ core     │ keyword      │ Continue a loop from the next iteration                               
 3 │ create_left_prompt  │ default  │ custom       │                                                                       
 4 │ create_right_prompt │ default  │ custom       │                                                                       
 5 │ def                 │ core     │ keyword      │ Define a custom command                                               
 6 │ def-env             │ core     │ keyword      │ Define a custom command, which participates in the caller environment 
 7 │ export              │ core     │ keyword      │ Export definitions or environment variables from a module.            
 8 │ export alias        │ core     │ keyword      │ Define an alias and export it from a module                           
 9 │ export def          │ core     │ keyword      │ Define a custom command and export it from a module                   
───┴─────────────────────┴──────────┴──────────────┴───────────────────────────────────────────────────────────────────────

Specific information on a command

To find more specific information on a command, use help <COMMAND>.

> help fetch

Output

Fetch the contents from a URL (HTTP GET operation).

Usage:
  > fetch {flags} <URL>

Flags:
  -h, --help
      Display this help message
  -u, --user <Any>
      the username when authenticating
  -p, --password <Any>
      the password when authenticating
  -t, --timeout <Int>
      timeout period in seconds
  -H, --headers <Any>
      custom headers you want to add
  -r, --raw
      fetch contents as text rather than a table

Parameters:
  URL: the URL to fetch the contents from

Examples:
  Fetch content from url.com
  > fetch url.com

  Fetch content from url.com, with username and password
  > fetch -u myuser -p mypass url.com

  Fetch content from url.com, with custom header
  > fetch -H [my-header-key my-header-value] url.com

Specific information on a command subcommand

To find more specific information on a command subcommand, use help <COMMAND> <SUBCOMMAND>.

> help str reverse

Output

outputs the reversals of the strings in the pipeline

Usage:
  > str reverse ...(rest)

Flags:
  -h, --help
      Display this help message

Parameters:
  ...rest: optionally reverse text by column paths

Examples:
  Return the reversals of multiple strings
  > 'Nushell' | str reverse