$a | append $b
# => ╭───┬──────────────┬───────────────┬──────────────╮
# => │ # │ first_column │ second_column │ third_column │
# => ├───┼──────────────┼───────────────┼──────────────┤
# => │ 0 │ foo          │ bar           │ snooze       │
# => │ 1 │ hex          │ seeze         │ feeze        │
# => ╰───┴──────────────┴───────────────┴──────────────╯
```

remove the last column of a table:

```nu
let teams_scores = [[team score plays]; ['Boston Celtics' 311 3] ['Golden State Warriors', 245 2]]
$teams_scores | drop column
# => ╭───┬───────────────────────┬───────╮
# => │ # │         team          │ score │
# => ├───┼───────────────────────┼───────┤
# => │ 0 │ Boston Celtics        │   311 │
# => │ 1 │ Golden State Warriors │   245 │
# => ╰───┴───────────────────────┴───────╯
```

## Files and Filesystem

open a text file with the default text editor:

```nu
start file.txt
```

save a string to text file:

```nu
'lorem ipsum ' | save file.txt
```

append a string to the end of a text file:

```nu
'dolor sit amet' | save --append file.txt
```

save a record to file.json:

```nu
{ a: 1, b: 2 } | save file.json
```

recursively search for files by file name:

```nu
glob **/*.{rs,toml} --depth 2
```

watch a file, run command whenever it changes:

```nu
watch . --glob=**/*.rs {|| cargo test }
```

## Custom Commands

custom command with parameter type set to string:

```nu
def greet [name: string] {
    $"hello ($name)"
}
```

custom command with default parameter set to nushell:

```nu
def greet [name = "nushell"] {
    $"hello ($name)"
}
```

passing named parameter by defining flag for custom commands:

```nu
def greet [
    name: string
    --age: int
] {
    [$name $age]
}

greet world --age 10
```

using flag as a switch with a shorthand flag (-a) for the age:

```nu
def greet [
    name: string
    --age (-a): int
    --twice
] {
    if $twice {
        [$name $age $name $age]
    } else {
        [$name $age]
    }
}
greet -a 10 --twice hello
```

custom command which takes any number of positional arguments using rest params:

```nu
def greet [...name: string] {
    print "hello all:"
    for $n in $name {
        print $n