diff --git a/src/cmd/install.rs b/src/cmd/install.rs
index 14a7cfc..458eacb 100644
--- a/src/cmd/install.rs
+++ b/src/cmd/install.rs
@@ -208,22 +208,8 @@ pub fn cmd_install(matches: &ArgMatches, session: &Session) -> Result<()> {
 
                     let mut stdout = std::io::stdout();
                     let _ = stdout.execute(cursor::Show);
-                    loop {
-                        print!("\nDo you want to continue? [y/N]: ");
-                        std::io::stdout().flush().unwrap();
-                        let mut input = String::new();
-                        std::io::stdin().read_line(&mut input).unwrap();
-                        //
-                        if input.chars().count() == 3 {
-                            let ch: char = input.chars().next().unwrap();
-                            if ['y', 'Y', 'n', 'N'].contains(&ch) {
-                                let ret = ch == 'y' || ch == 'Y';
-                                let _ = tx.send(Event::PromptTransactionNeedConfirmResult(ret));
-                                break;
-                            }
-                        }
-                    }
-
+                    let answer = cui::prompt_yes_no();
+                    let _ = tx.send(Event::PromptTransactionNeedConfirmResult(answer));
                     let _ = stdout.execute(cursor::Hide);
                 }
                 Event::PackageSyncDone => break,
diff --git a/src/cmd/uninstall.rs b/src/cmd/uninstall.rs
index e1a8f4d..2dd8dc0 100644
--- a/src/cmd/uninstall.rs
+++ b/src/cmd/uninstall.rs
@@ -1,9 +1,8 @@
 use clap::ArgMatches;
 use crossterm::style::Stylize;
 use libscoop::{operation, Event, Session, SyncOption};
-use std::io::Write;
 
-use crate::Result;
+use crate::{cui, Result};
 
 pub fn cmd_uninstall(matches: &ArgMatches, session: &Session) -> Result<()> {
     let queries = matches
@@ -57,21 +56,8 @@ pub fn cmd_uninstall(matches: &ArgMatches, session: &Session) -> Result<()> {
                         println!("  {}", output);
                     }
 
-                    loop {
-                        print!("\nDo you want to continue? [y/N]: ");
-                        std::io::stdout().flush().unwrap();
-                        let mut input = String::new();
-                        std::io::stdin().read_line(&mut input).unwrap();
-                        //
-                        if input.chars().count() == 3 {
-                            let ch: char = input.chars().next().unwrap();
-                            if ['y', 'Y', 'n', 'N'].contains(&ch) {
-                                let ret = ch == 'y' || ch == 'Y';
-                                let _ = tx.send(Event::PromptTransactionNeedConfirmResult(ret));
-                                break;
-                            }
-                        }
-                    }
+                    let answer = cui::prompt_yes_no();
+                    let _ = tx.send(Event::PromptTransactionNeedConfirmResult(answer));
                 }
                 Event::PackageCommitStart(ctx) => {
                     println!("Uninstalling {}...", ctx);
diff --git a/src/cmd/upgrade.rs b/src/cmd/upgrade.rs
index 5e77c0f..e360e54 100644
--- a/src/cmd/upgrade.rs
+++ b/src/cmd/upgrade.rs
@@ -6,7 +6,6 @@ use crossterm::{
     ExecutableCommand,
 };
 use libscoop::{operation, Event, Session, SyncOption};
-use std::io::Write;
 
 use crate::{cui, util, Result};
 
@@ -159,22 +158,8 @@ pub fn cmd_upgrade(matches: &ArgMatches, session: &Session) -> Result<()> {
 
                     let mut stdout = std::io::stdout();
                     let _ = stdout.execute(cursor::Show);
-                    loop {
-                        print!("\nDo you want to continue? [y/N]: ");
-                        std::io::stdout().flush().unwrap();
-                        let mut input = String::new();
-                        std::io::stdin().read_line(&mut input).unwrap();
-                        //
-                        if input.chars().count() == 3 {
-                            let ch: char = input.chars().next().unwrap();
-                            if ['y', 'Y', 'n', 'N'].contains(&ch) {
-                                let ret = ch == 'y' || ch == 'Y';
-                                let _ = tx.send(Event::PromptTransactionNeedConfirmResult(ret));
-                                break;
-                            }
-                        }
-                    }
-
+                    let answer = cui::prompt_yes_no();
+                    let _ = tx.send(Event::PromptTransactionNeedConfirmResult(answer));
                     let _ = stdout.execute(cursor::Hide);
                 }
                 Event::PackageSyncDone => break,
diff --git a/src/cui.rs b/src/cui.rs
index 55e1f01..ad0f92a 100644
--- a/src/cui.rs
+++ b/src/cui.rs
@@ -5,7 +5,10 @@ use crossterm::{
     ExecutableCommand,
 };
 use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
-use std::{collections::HashMap, io::stdout};
+use std::{
+    collections::HashMap,
+    io::{stdout, Write},
+};
 
 static BAR_FMT: &str = " {wide_msg} {total_bytes:>12} [{bar:>20}] {percent:>3}%";
 
@@ -147,3 +150,20 @@ impl BucketUpdateUI {
             .unwrap();
     }
 }
+
+/// Prompt user to continue or not.
+pub fn prompt_yes_no() -> bool {
+    loop {
+        print!("\nDo you want to continue? [y/N]: ");
+        std::io::stdout().flush().unwrap();
+        let mut input = String::new();
+        std::io::stdin().read_line(&mut input).unwrap();
+        let c = input.trim_end();
+        if c.chars().count() == 1 {
+            let ch: char = c.chars().next().unwrap();
+            if ['y', 'Y', 'n', 'N'].contains(&ch) {
+                return ch == 'y' || ch == 'Y';
+            }
+        }
+    }
+}