Revert "Rewrite the ps command"

src/commands/ps.rs

@@ -0,0 +1,17 @@
+use crate::errors::ShellError;
+use crate::object::process::process_dict;
+use crate::prelude::*;
+use sysinfo::{RefreshKind, SystemExt};
+
+pub fn ps(args: CommandArgs, _registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
+    let mut system = sysinfo::System::new_with_specifics(RefreshKind::new().with_processes());
+    system.refresh_processes();
+    let list = system.get_process_list();
+
+    let list = list
+        .into_iter()
+        .map(|(_, process)| process_dict(process, Tag::unknown_origin(args.call_info.name_span)))
+        .collect::<VecDeque<_>>();
+
+    Ok(list.from_input_stream())
+}