diff --git a/src/main.tsx b/src/main.tsx
index ac433c04..8b8a8233 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -168,6 +168,7 @@ class LineCmd extends React.Component<{line : LineType, session : Session, chang
         let {session, line} = this.props;
         let lineid = line.lineid.toString();
         let running = false;
+        let detached = false;
         let rows = 0;
         let cols = 0;
         let termWrap = session.getTermWrapByLine(line);
@@ -181,10 +182,12 @@ class LineCmd extends React.Component<{line : LineType, session : Session, chang
         let remote : RemoteType = null;
         if (cmd != null) {
             remote = session.getRemote(cmd.remoteid);
+            running = (cmd.status == "running");
+            detached = (cmd.status == "detached");
         }
         return (
             <div className="line line-cmd" id={"line-" + getLineId(line)}>
-                <div className={cn("avatar",{"num4": lineid.length == 4}, {"num5": lineid.length >= 5}, {"running": running})}>
+                <div className={cn("avatar",{"num4": lineid.length == 4}, {"num5": lineid.length >= 5}, {"running": running}, {"detached": detached})}>
                     {lineid}
                 </div>
                 <div className="line-content">
@@ -353,7 +356,6 @@ class SessionView extends React.Component<{session : Session}, {}> {
 
     @boundMethod
     changeSizeCallback(term : TermWrap) {
-        console.log("changesize", term);
         if (this.shouldFollow.get()) {
             let session = this.props.session;
             let window = session.getActiveWindow();
diff --git a/src/session.ts b/src/session.ts
index 83e427e2..3dca4c57 100644
--- a/src/session.ts
+++ b/src/session.ts
@@ -318,13 +318,19 @@ class Session {
     }
 
     getTermWrapByLine(line : LineType) : TermWrap {
+        if (!line.cmdid) {
+            return null;
+        }
         let termKey = makeTermKey(line.sessionid, line.cmdid, line.windowid, line.lineid);
         let termWrap = this.termMap[termKey];
         if (termWrap != null) {
             return termWrap;
         }
-        termWrap = new TermWrap(line.sessionid, line.cmdid);
-        console.log("create term", termWrap);
+        let cmd = this.getCmd(line.cmdid);
+        if (!cmd) {
+            return null;
+        }
+        termWrap = new TermWrap(line.sessionid, line.cmdid, cmd.status);
         this.termMap[termKey] = termWrap;
         this.termMapById[termWrap.termId] = termWrap;
         termWrap.initialized = true;
diff --git a/src/sh2.less b/src/sh2.less
index 617f6645..dbcf7605 100644
--- a/src/sh2.less
+++ b/src/sh2.less
@@ -203,7 +203,7 @@ html, body, #main {
     .avatar {
         height: 38px;
         width: 38px;
-        background-color: #729fcf;
+        background-color: #555;
         display: flex;
         align-items: center;
         justify-content: center;
@@ -222,7 +222,12 @@ html, body, #main {
         }
 
         &.running {
-            background-color: #cc0000;
+            background-color: #729fcf;
+        }
+
+        &.detached {
+            background-color: #729fcf;
+            outline: 2px solid white;
         }
     }
 
diff --git a/src/term.ts b/src/term.ts
index ef7a4c6e..90e8f95c 100644
--- a/src/term.ts
+++ b/src/term.ts
@@ -34,41 +34,79 @@ class TermWrap {
     initialized : boolean = false;
     changeSizeCallback : (TermWrap) => void = null;
     usedRows : number;
+    tailReqId : string;
+    cmdStatus : string;
 
-    constructor(sessionId : string, cmdId : string) {
+    constructor(sessionId : string, cmdId : string, status : string) {
         this.termId = uuidv4();
         this.sessionId = sessionId;
         this.cmdId = cmdId;
+        this.cmdStatus = status;
         this.terminal = new Terminal({rows: 25, cols: 80, theme: {foreground: "#d3d7cf"}});
         this.usedRows = 2;
     }
 
     destroy() {
-        
+        this.stopPtyTail();
+    }
+
+    setCmdStatus(status : string) {
+        if (this.cmdStatus == status) {
+            return;
+        }
+        this.cmdStatus = status;
+        if (!this.canTailPty() && this.tailReqId) {
+            this.stopPtyTail();
+        }
+    }
+
+    canTailPty() : boolean {
+        return this.cmdStatus == "running" || this.cmdStatus == "detached";
     }
 
     @boundMethod
     onKeyHandler(event : any) {
         let inputPacket = {
             type: "input",
-            sessionid: this.sessionId,
-            cmdid: this.cmdId,
+            ck: this.sessionId + "/" + this.cmdId,
             inputdata: event.key,
         };
         GlobalWS.pushMessage(inputPacket);
     }
 
+    stopPtyTail() {
+        if (this.tailReqId == null) {
+            return;
+        }
+        let untailCmdPacket = {
+            type: "untailcmd",
+            reqid: uuidv4(),
+            ck: this.sessionId + "/" + this.cmdId,
+        };
+        GlobalWS.sendMessage(untailCmdPacket);
+        GlobalWS.unregisterReq(this.tailReqId);
+        this.tailReqId = null;
+    }
+
     startPtyTail() {
+        if (this.tailReqId != null) {
+            return;
+        }
+        if (!this.canTailPty()) {
+            return;
+        }
+        this.tailReqId = uuidv4();
         let getCmdPacket = {
             type: "getcmd",
-            reqid: this.termId,
-            sessionid: this.sessionId,
-            cmdid: this.cmdId,
+            reqid: this.tailReqId,
+            ck: this.sessionId + "/" + this.cmdId,
             ptypos: this.ptyPos,
             tail: true,
+            ptyonly: true,
         };
         GlobalWS.registerAndSendGetCmd(getCmdPacket, (dataPacket) => {
-            this.updatePtyData(this.ptyPos, dataPacket.ptydata, dataPacket.ptydatalen);
+            let realData = atob(dataPacket.ptydata64);
+            this.updatePtyData(this.ptyPos, realData, dataPacket.ptydatalen);
         });
     }
 
@@ -109,7 +147,13 @@ class TermWrap {
                 usedRows = i+1;
             }
         }
-        this.usedRows = usedRows;
+        if (this.usedRows != usedRows) {
+            this.usedRows = usedRows;
+            if (this.changeSizeCallback != null) {
+                let cb = this.changeSizeCallback;
+                setTimeout(() => cb(this), 0);
+            }
+        }
         return;
     }
 
diff --git a/src/ws.ts b/src/ws.ts
index cf1bda2e..f0d2f4e3 100644
--- a/src/ws.ts
+++ b/src/ws.ts
@@ -29,6 +29,10 @@ class WSControl {
         this.pushMessage(pk)
     }
 
+    unregisterReq(reqid : string) {
+        delete this.reqMap[reqid];
+    }
+
     reconnect() {
         if (this.open.get()) {
             this.wsConn.close();
@@ -123,9 +127,9 @@ class WSControl {
             return;
         }
         if (eventData.type == "cmddata") {
-            let cb = this.reqMap[eventData.reqid];
+            let cb = this.reqMap[eventData.respid];
             if (!cb) {
-                console.log(sprintf("websocket cmddata req=%s -- no callback", eventData.reqid));
+                console.log(sprintf("websocket cmddata req=%s -- no callback", eventData.respid));
                 return;
             }
             cb(eventData);