Update where.md

docs/commands/where.md

@@ -2,6 +2,39 @@
 
 This command filters the content of a table based on a condition passed as a parameter, which must be a boolean expression making use of any of the table columns. Other commands such as `ls` are capable of feeding `where` with their output through pipelines.
 
+Where has two general forms:
+- `where <column_name> <comparison> <value>`
+- `where <column_name>`
+
+## Where with comparison
+
+In the first form, `where` is passed a column name that the filter will run against. Next, is the operator used to compare this column to its value. The following operators are supported:
+
+- `<` (less than)
+- `<=` (less than or equal)
+- `>` (greater than)
+- `>=` (greater than or equal)
+- `!=` (not equal)
+- `==` (equal)
+
+Strings have two additional operators:
+- `=~` (fuzzy match to allow)
+- `!~` (fuzzy match to not allow)
+
+Dates can also be compared using the duration types. For example, `where accessed > 2w` will check the date in accessed to see if it's greater than 2 weeks ago. Durations currently allow these abbreviations:
+
+- `1s` (one second)
+- `1m` (one minute)
+- `1h` (one hour)
+- `1d` (one day)
+- `1w` (one week)
+- `1M` (one month)
+- `1y` (one year)
+
+## Boolean check
+
+Where with the form `| where readonly` is used to check boolean values. For example, the command `ls --full | where readonly` will list only those files that are readonly.
+
 ## Usage
 ```shell
 > [input-command] | where [condition]
@@ -31,3 +64,27 @@ This command filters the content of a table based on a condition passed as a par
  3 │ 13556 │ nu_plugin_ps          │ Sleeping │ 40.70250000000000 
 ━━━┷━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━
 ```
+
+```shell
+> ls | where accessed <= 1w
+━━━┯━━━━━━━━━━━━━━━┯━━━━━━━━━━━┯━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━
+ # │ name          │ type      │ size     │ accessed   │ modified 
+───┼───────────────┼───────────┼──────────┼────────────┼────────────
+ 0 │ Cargo.toml    │ File      │   4.7 KB │ 2 days ago │ 2 days ago 
+ 1 │ target        │ Directory │   4.1 KB │ 2 days ago │ 2 days ago 
+ 2 │ Makefile.toml │ File      │    449 B │ 4 days ago │ 4 days ago 
+ 3 │ README.md     │ File      │  19.5 KB │ 2 days ago │ 2 days ago 
+ 4 │ Cargo.lock    │ File      │ 170.7 KB │ 2 days ago │ 2 days ago 
+ 5 │ crates        │ Directory │   4.1 KB │ 2 days ago │ 2 days ago 
+ 6 │ TODO.md       │ File      │   1.3 KB │ 2 days ago │ 2 days ago 
+━━━┷━━━━━━━━━━━━━━━┷━━━━━━━━━━━┷━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━
+```
+
+```shell
+> ls | where name =~ "yml"
+━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━
+ name        │ type │ size  │ accessed   │ modified 
+─────────────┼──────┼───────┼────────────┼────────────
+ .gitpod.yml │ File │ 780 B │ a week ago │ a week ago 
+━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━
+```