feat: fix and update some examples (#4844)

crates/nu-command/src/filesystem/ls.rs

@@ -224,6 +224,22 @@ impl Command for Ls {
                 example: "ls *.rs",
                 result: None,
             },
+            Example {
+                description: "List all files and directories whose name do not contain 'bar'",
+                example: "ls -s | where name !~ bar",
+                result: None,
+            },
+            Example {
+                description: "List all dirs with full path name in your home directory",
+                example: "ls -f ~ | where type == dir",
+                result: None,
+            },
+            Example {
+                description:
+                    "List all dirs in your home directory which have not been modified in 7 days",
+                example: "ls -s ~ | where type == dir && modified < ((date now) - 7day)",
+                result: None,
+            },
         ]
     }
 }

crates/nu-command/src/filters/reduce.rs

@@ -46,6 +46,14 @@ impl Command for Reduce {
                     span: Span::test_data(),
                 }),
             },
+            Example {
+                example: "[ 1 2 3 ] | reduce -n {|it, acc| $acc + $it.item }",
+                description: "Sum values of a list (same as 'math sum')",
+                result: Some(Value::Int {
+                    val: 6,
+                    span: Span::test_data(),
+                }),
+            },
             Example {
                 example: "[ 1 2 3 4 ] | reduce -f 10 {|it, acc| $acc + $it }",
                 description: "Sum values with a starting value (fold)",

crates/nu-command/src/filters/where_.rs

@@ -96,7 +96,7 @@ impl Command for Where {
             },
             Example {
                 description: "List all files that were modified in the last two weeks",
-                example: "ls | where modified <= 2wk",
+                example: "ls | where modified >= (date now) - 2wk",
                 result: None,
             },
         ]