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-# Shell Scripting
-
-Tomo comes with a built-in [lang](langs.md) called `Shell` for shell commands.
-This lets you write and invoke shell commands in a more type-safe way.
-
-```tomo
-user_name := ask("What's your name? ")
-_ := $Shell"echo Hello $user_name"
-```
-
-In the above example, there is no risk of code injection, because the
-user-controlled string is automatically escaped when performing interpolation.
-
-## Shell Methods
-
-- [`func by_line(command: Shell -> Void)`](#by_line)
-- [`func execute(command: Shell -> Int32?)`](#execute)
-- [`func run(command: Shell -> Text?)`](#run)
-- [`func run_bytes(command: Shell -> [Byte]?)`](#run_bytes)
-
-### `by_line`
-Run a shell command and return an iterator over its output, line-by-line.
-
-```tomo
-func by_line(command: Shell -> Void)
-```
-
-- `command`: The command to run.
-
-**Returns:**  
-An optional iterator over the lines of the command's output. If the command fails
-to run, `none` will be returned.
-
-**Example:**  
-```tomo
-i := 1
-for line in $Shell"ping www.example.com":by_line()!:
-    stop if i > 5
-    i += 1
-```
-
-### `execute`
-Execute a shell command without capturing its output and return its exit status.
-
-```tomo
-func execute(command: Shell -> Int32?)
-```
-
-- `command`: The command to execute.
-
-**Returns:**  
-If the command exits normally, return its exit status. Otherwise return `none`.
-
-**Example:**  
-```tomo
->> $Shell"touch file.txt":execute()
-= 0?
-```
-
----
-
-### `run`
-Run a shell command and return the output text from `stdout`.
-
-```tomo
-func run(command: Shell -> Text?)
-```
-
-- `command`: The command to run.
-
-**Returns:**  
-If the program fails to run (e.g. a non-existent command), return `none`,
-otherwise return the entire standard output of the command as text. **Note:**
-if there is a trailing newline, it will be stripped.
-
-**Example:**  
-```tomo
->> $Shell"seq 5":run()
-= "1$\n2$\n3$\n4$\n5"
-```
-
----
-
-### `run_bytes`
-Run a shell command and return the output in raw bytes from `stdout`.
-
-```tomo
-func run_bytes(command: Shell -> [Byte]?)
-```
-
-- `command`: The command to run.
-
-**Returns:**  
-If the program fails to run (e.g. a non-existent command), return `none`,
-otherwise return the entire standard output of the command as an array of
-bytes.
-
-**Example:**  
-```tomo
->> $Shell"seq 5":run_bytes()
-= [0x31, 0x0A, 0x32, 0x0A, 0x33, 0x0A, 0x34, 0x0A, 0x35, 0x0A]
-```