update command description

src/cmd/schema.rs

@@ -19,7 +19,11 @@ macro_rules! fail {
 }
 
 static USAGE: &str = "
-Infer schema from CSV data and output in JSON Schema format.
+Generate JSON Schema from CSV data.
+
+This command generates reference JSON Schema (Draft 7) from CSV data, 
+including simple validation rules based on data statistics.
+Please verify and adjust the Type, Value Constraints, and Required Fields as appropriate.
 
 Example output file from `mydata.csv`. If piped from stdin, then filename is `stdin.csv`.
 

src/main.rs

@@ -71,7 +71,7 @@ macro_rules! command_list {
     replace     Replace patterns in CSV data
     reverse     Reverse rows of CSV data
     sample      Randomly sample CSV data
-    schema      Infer schema from CSV data
+    schema      Generate JSON Schema from CSV data
     search      Search CSV data with a regex
     searchset   Search CSV data with a regex set
     select      Select, re-order, duplicate or drop columns

src/mainlite.rs

@@ -64,7 +64,7 @@ macro_rules! command_list {
     replace     Replace patterns in CSV data
     reverse     Reverse rows of CSV data
     sample      Randomly sample CSV data
-    schema      Infer schema from CSV data
+    schema      Generate JSON Schema from CSV data
     search      Search CSV data with a regex
     searchset   Search CSV data with a regex set
     select      Select, re-order, duplicate or drop columns