Merge pull request #16 from snonux/develop

Multiple minor enhancements.

41 files changed, 147 insertions, 494 deletions

diff --git a/cmd/dcat/main.go b/cmd/dcat/main.go
index 05e46ab..c59a242 100644
--- a/cmd/dcat/main.go
+++ b/cmd/dcat/main.go
@@ -29,6 +29,7 @@ func main() {
 	flag.BoolVar(&debugEnable, "debug", false, "Activate debug messages")
 	flag.BoolVar(&displayVersion, "version", false, "Display version")
 	flag.BoolVar(&noColor, "noColor", false, "Disable ANSII terminal colors")
+	flag.BoolVar(&args.Quiet, "quiet", false, "Quiet output mode")
 	flag.IntVar(&args.ConnectionsPerCPU, "cpc", 10, "How many connections established per CPU core concurrently")
 	flag.IntVar(&sshPort, "port", 2222, "SSH server port")
 	flag.StringVar(&args.Discovery, "discovery", "", "Server discovery method")
diff --git a/cmd/dgrep/main.go b/cmd/dgrep/main.go
index 133631f..276dff4 100644
--- a/cmd/dgrep/main.go
+++ b/cmd/dgrep/main.go
@@ -31,6 +31,7 @@ func main() {
 	flag.BoolVar(&debugEnable, "debug", false, "Activate debug messages")
 	flag.BoolVar(&displayVersion, "version", false, "Display version")
 	flag.BoolVar(&noColor, "noColor", false, "Disable ANSII terminal colors")
+	flag.BoolVar(&args.Quiet, "quiet", false, "Quiet output mode")
 	flag.IntVar(&args.ConnectionsPerCPU, "cpc", 10, "How many connections established per CPU core concurrently")
 	flag.IntVar(&sshPort, "port", 2222, "SSH server port")
 	flag.StringVar(&args.Discovery, "discovery", "", "Server discovery method")
diff --git a/cmd/dmap/main.go b/cmd/dmap/main.go
index 9f9ca9d..a954e45 100644
--- a/cmd/dmap/main.go
+++ b/cmd/dmap/main.go
@@ -34,6 +34,7 @@ func main() {
 	flag.BoolVar(&debugEnable, "debug", false, "Activate debug messages")
 	flag.BoolVar(&displayVersion, "version", false, "Display version")
 	flag.BoolVar(&noColor, "noColor", false, "Disable ANSII terminal colors")
+	flag.BoolVar(&args.Quiet, "quiet", false, "Quiet output mode")
 	flag.IntVar(&args.ConnectionsPerCPU, "cpc", 10, "How many connections established per CPU core concurrently")
 	flag.IntVar(&args.Timeout, "timeout", 0, "Max time dtail server will collect data until disconnection")
 	flag.IntVar(&sshPort, "port", 2222, "SSH server port")
diff --git a/cmd/dtail/main.go b/cmd/dtail/main.go
index aefaa6a..5d4bad1 100644
--- a/cmd/dtail/main.go
+++ b/cmd/dtail/main.go
@@ -42,6 +42,7 @@ func main() {
 	flag.BoolVar(&debugEnable, "debug", false, "Activate debug messages")
 	flag.BoolVar(&displayVersion, "version", false, "Display version")
 	flag.BoolVar(&noColor, "noColor", false, "Disable ANSII terminal colors")
+	flag.BoolVar(&args.Quiet, "quiet", false, "Quiet output mode")
 	flag.IntVar(&args.ConnectionsPerCPU, "cpc", 10, "How many connections established per CPU core concurrently")
 	flag.IntVar(&args.Timeout, "timeout", 0, "Max time dtail server will collect data until disconnection")
 	flag.IntVar(&pprof, "pprof", -1, "Start PProf server this port")
diff --git a/go.mod b/go.mod
index 9c11b58..c19efe7 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/DataDog/zstd v1.4.5
 	golang.org/x/crypto v0.0.0-20201203163018-be400aefbc4c
-	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
+	golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 // indirect
 	golang.org/x/sys v0.0.0-20201207223542-d4d67f95c62d // indirect
 	golang.org/x/term v0.0.0-20201207232118-ee85cb95a76b // indirect
 )
diff --git a/go.sum b/go.sum
index c0ef657..c423bb0 100644
--- a/go.sum
+++ b/go.sum
@@ -14,6 +14,8 @@ golang.org/x/lint v0.0.0-20200130185559-910be7a94367 h1:0IiAsCRByjO2QjX7ZPkw5oU9
 golang.org/x/lint v0.0.0-20200130185559-910be7a94367/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b h1:Wh+f8QHJXR411sJR8/vRBTZ7YapZaRvUcLFFJhusH0k=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
+golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 h1:2M3HP5CCK1Si9FQhwnzYhXdG6DXeebvUHFpre8QvbyI=
+golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
diff --git a/internal/clients/args.go b/internal/clients/args.go
index 34fcfa2..7f782f1 100644
--- a/internal/clients/args.go
+++ b/internal/clients/args.go
@@ -22,4 +22,5 @@ type Args struct {
 	SSHAuthMethods     []gossh.AuthMethod
 	SSHHostKeyCallback gossh.HostKeyCallback
 	PrivateKeyPathFile string
+	Quiet            bool
 }
diff --git a/internal/clients/baseclient.go b/internal/clients/baseclient.go
index 69055a3..f20156f 100644
--- a/internal/clients/baseclient.go
+++ b/internal/clients/baseclient.go
@@ -39,7 +39,7 @@ type baseClient struct {
 }
 
 func (c *baseClient) init() {
-	logger.Info("Initiating base client")
+	logger.Debug("Initiating base client")
 
 	flag := regex.Default
 	if c.Args.RegexInvert {
@@ -70,7 +70,7 @@ func (c *baseClient) Start(ctx context.Context, statsCh <-chan string) (status i
 	// Periodically check for unknown hosts, and ask the user whether to trust them or not.
 	go c.hostKeyCallback.PromptAddHosts(ctx)
 	// Print client stats every time something on statsCh is recieved.
-	go c.stats.Start(ctx, c.throttleCh, statsCh)
+	go c.stats.Start(ctx, c.throttleCh, statsCh, c.Args.Quiet)
 	// Keep count of active connections
 	active := make(chan struct{}, len(c.connections))
 
@@ -127,7 +127,7 @@ func (c *baseClient) makeConnection(server string, sshAuthMethods []gossh.AuthMe
 }
 
 func (c *baseClient) waitUntilDone(ctx context.Context, active chan struct{}) {
-	defer logger.Info("Terminated connection")
+	defer logger.Debug("Terminated connection")
 
 	// We want to have at least one active connection
 	<-active
diff --git a/internal/clients/catclient.go b/internal/clients/catclient.go
index d8e9196..b7b6131 100644
--- a/internal/clients/catclient.go
+++ b/internal/clients/catclient.go
@@ -42,8 +42,9 @@ func (c CatClient) makeHandler(server string) handlers.Handler {
 }
 
 func (c CatClient) makeCommands() (commands []string) {
+	options := fmt.Sprintf("quiet=%v", c.Args.Quiet)
 	for _, file := range strings.Split(c.What, ",") {
-		commands = append(commands, fmt.Sprintf("%s %s %s", c.Mode.String(), file, c.Regex.Serialize()))
+		commands = append(commands, fmt.Sprintf("%s:%s %s %s", c.Mode.String(), options, file, c.Regex.Serialize()))
 	}
 	return
 }
diff --git a/internal/clients/grepclient.go b/internal/clients/grepclient.go
index 4024083..652c31b 100644
--- a/internal/clients/grepclient.go
+++ b/internal/clients/grepclient.go
@@ -41,8 +41,10 @@ func (c GrepClient) makeHandler(server string) handlers.Handler {
 }
 
 func (c GrepClient) makeCommands() (commands []string) {
+	options := fmt.Sprintf("quiet=%v", c.Args.Quiet)
 	for _, file := range strings.Split(c.What, ",") {
-		commands = append(commands, fmt.Sprintf("%s %s %s", c.Mode.String(), file, c.Regex.Serialize()))
+		commands = append(commands, fmt.Sprintf("%s:%s %s %s", c.Mode.String(), options, file, c.Regex.Serialize()))
 	}
+
 	return
 }
diff --git a/internal/clients/handlers/basehandler.go b/internal/clients/handlers/basehandler.go
index b5045e2..f07fd90 100644
--- a/internal/clients/handlers/basehandler.go
+++ b/internal/clients/handlers/basehandler.go
@@ -4,7 +4,6 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"strconv"
 	"strings"
 	"time"
 
@@ -78,6 +77,7 @@ func (h *baseHandler) Read(p []byte) (n int, err error) {
 	case <-h.Done():
 		return 0, io.EOF
 	}
+
 	return
 }
 
@@ -111,21 +111,5 @@ func (h *baseHandler) handleHiddenMessage(message string) {
 		case <-h.Done():
 			return
 		}
-
-	case strings.HasPrefix(message, ".run exitstatus"):
-		splitted := strings.Split(strings.TrimSuffix(message, "\n"), " ")
-		if len(splitted) != 3 {
-			logger.Error("Unable to retrieve exitstatus", message)
-			return
-		}
-		i, err := strconv.Atoi(splitted[2])
-		if err != nil {
-			logger.Error("Unable to retrieve exitstatus", message, err)
-			return
-		}
-		logger.Debug("Retrieved exitstatus", h.status)
-		if i > h.status {
-			h.status = i
-		}
 	}
 }
diff --git a/internal/clients/handlers/healthhandler.go b/internal/clients/handlers/healthhandler.go
index 08ed137..0440706 100644
--- a/internal/clients/handlers/healthhandler.go
+++ b/internal/clients/handlers/healthhandler.go
@@ -19,6 +19,7 @@ type HealthHandler struct {
 	receive chan<- string
 	// The remote server address
 	server string
+	// The return status.
 	status int
 }
 
diff --git a/internal/clients/maker.go b/internal/clients/maker.go
index 1ba6482..d5ffd8b 100644
--- a/internal/clients/maker.go
+++ b/internal/clients/maker.go
@@ -4,6 +4,9 @@ import (
 	"github.com/mimecast/dtail/internal/clients/handlers"
 )
 
+// maker interface helps to re-use code in all DTail client implementations.
+// All clients share the baseClient but have different connection handlers
+// and send different commands to the DTail server.
 type maker interface {
 	makeHandler(server string) handlers.Handler
 	makeCommands() (commands []string)
diff --git a/internal/clients/maprclient.go b/internal/clients/maprclient.go
index 6aadd6b..1c0c2cc 100644
--- a/internal/clients/maprclient.go
+++ b/internal/clients/maprclient.go
@@ -99,7 +99,7 @@ func (c *MaprClient) Start(ctx context.Context, statsCh <-chan string) (status i
 
 	status = c.baseClient.Start(ctx, statsCh)
 	if c.cumulative {
-		logger.Info("Received final mapreduce result")
+		logger.Debug("Received final mapreduce result")
 		c.reportResults()
 	}
 
@@ -112,6 +112,7 @@ func (c MaprClient) makeHandler(server string) handlers.Handler {
 
 func (c MaprClient) makeCommands() (commands []string) {
 	commands = append(commands, fmt.Sprintf("map %s", c.query.RawQuery))
+	options := fmt.Sprintf("quiet=%v", c.Args.Quiet)
 
 	modeStr := "cat"
 	if c.Mode == omode.TailClient {
@@ -123,7 +124,7 @@ func (c MaprClient) makeCommands() (commands []string) {
 			commands = append(commands, fmt.Sprintf("timeout %d %s %s %s", c.Timeout, modeStr, file, c.Regex.Serialize()))
 			continue
 		}
-		commands = append(commands, fmt.Sprintf("%s %s %s", modeStr, file, c.Regex.Serialize()))
+		commands = append(commands, fmt.Sprintf("%s:%s %s %s", modeStr, options, file, c.Regex.Serialize()))
 	}
 
 	return
@@ -133,7 +134,7 @@ func (c *MaprClient) periodicReportResults(ctx context.Context) {
 	for {
 		select {
 		case <-time.After(c.query.Interval):
-			logger.Info("Gathering interim mapreduce result")
+			logger.Debug("Gathering interim mapreduce result")
 			c.reportResults()
 		case <-ctx.Done():
 			return
@@ -165,7 +166,7 @@ func (c *MaprClient) printResults() {
 	}
 
 	if numLines == 0 {
-		logger.Info("Empty result set this time...")
+		logger.Warn("Empty result set this time...")
 		return
 	}
 
diff --git a/internal/clients/runclient.go b/internal/clients/runclient.go
deleted file mode 100644
index 5464d54..0000000
--- a/internal/clients/runclient.go
+++ /dev/null
@@ -1,87 +0,0 @@
-package clients
-
-import (
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/hex"
-	"fmt"
-	"runtime"
-	"strings"
-
-	"github.com/mimecast/dtail/internal/clients/handlers"
-	"github.com/mimecast/dtail/internal/io/logger"
-	"github.com/mimecast/dtail/internal/omode"
-)
-
-// RunClient is a client to run various commands on the server.
-type RunClient struct {
-	baseClient
-	jobName    string
-	background string
-}
-
-// NewRunClient returns a new run client to execute commands on the remote server.
-func NewRunClient(args Args, background, jobName string) (*RunClient, error) {
-	args.Mode = omode.RunClient
-
-	if jobName == "" {
-		jobName = hash(strings.Join(args.Arguments, " "))
-	}
-
-	c := RunClient{
-		baseClient: baseClient{
-			Args:       args,
-			throttleCh: make(chan struct{}, args.ConnectionsPerCPU*runtime.NumCPU()),
-			retry:      false,
-		},
-		jobName:    jobName,
-		background: background,
-	}
-
-	c.init()
-	c.makeConnections(c)
-
-	return &c, nil
-}
-
-func (c RunClient) makeHandler(server string) handlers.Handler {
-	return handlers.NewClientHandler(server)
-}
-
-func (c RunClient) makeCommands() (commands []string) {
-	if c.Timeout > 0 {
-		commands = append(commands, fmt.Sprintf("timeout %d run%s %s", c.Timeout, c.options(), c.What))
-		return
-	}
-
-	commands = append(commands, fmt.Sprintf("run%s %s", c.options(), c.What))
-	return
-}
-
-func (c RunClient) options() string {
-	var sb strings.Builder
-
-	logger.Debug("options", fmt.Sprintf(":background=%s", c.background))
-	sb.WriteString(fmt.Sprintf(":background=%s", c.background))
-
-	logger.Debug("options", fmt.Sprintf(":jobName=%s", c.jobName))
-	sb.WriteString(fmt.Sprintf(":jobName=%s", c.jobName))
-
-	if len(c.Arguments) > 0 {
-		logger.Debug("options", fmt.Sprintf(":outerArgs=base64%%%s", strings.Join(c.Arguments, " ")))
-		sb.WriteString(fmt.Sprintf(":outerArgs=base64%%%s", encode64(strings.Join(c.Arguments, " "))))
-	}
-
-	return sb.String()
-}
-
-func encode64(str string) string {
-	return base64.StdEncoding.EncodeToString([]byte(str))
-}
-
-func hash(str string) string {
-	h := sha256.New()
-	h.Write([]byte(str))
-
-	return hex.EncodeToString(h.Sum(nil))
-}
diff --git a/internal/clients/stats.go b/internal/clients/stats.go
index 17343b5..d8163d4 100644
--- a/internal/clients/stats.go
+++ b/internal/clients/stats.go
@@ -34,7 +34,7 @@ func newTailStats(connectionsTotal int) *stats {
 
 // Start starts printing client connection stats every time a signal is recieved or
 // connection count has changed.
-func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <-chan string) {
+func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <-chan string, quiet bool) {
 	var connectedLast int
 
 	for {
@@ -45,7 +45,7 @@ func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <
 		case message := <-statsCh:
 			messages = append(messages, message)
 			force = true
-		case <-time.After(time.Second * 10):
+		case <-time.After(time.Second * 3):
 		case <-ctx.Done():
 			return
 		}
@@ -55,7 +55,7 @@ func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <
 
 		newConnections := connected - connectedLast
 
-		if connected == connectedLast && !force {
+		if (connected == connectedLast || quiet) && !force {
 			continue
 		}
 
@@ -63,7 +63,7 @@ func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <
 		switch force {
 		case true:
 			messages = append(messages, fmt.Sprintf("Connection stats: %s", stats))
-			s.printStatsOnInterrupt(messages)
+			s.printStatsDueInterrupt(messages)
 		default:
 			logger.Info(stats)
 		}
@@ -75,7 +75,7 @@ func (s *stats) Start(ctx context.Context, throttleCh <-chan struct{}, statsCh <
 	}
 }
 
-func (s *stats) printStatsOnInterrupt(messages []string) {
+func (s *stats) printStatsDueInterrupt(messages []string) {
 	logger.Pause()
 	for _, message := range messages {
 		fmt.Println(fmt.Sprintf(" %s", message))
@@ -107,5 +107,6 @@ func percentOf(total float64, value float64) float64 {
 	if total == 0 || total == value {
 		return 100
 	}
+
 	return value / (total / 100.0)
 }
diff --git a/internal/clients/tailclient.go b/internal/clients/tailclient.go
index 53b5ba4..cefbaa7 100644
--- a/internal/clients/tailclient.go
+++ b/internal/clients/tailclient.go
@@ -29,6 +29,7 @@ func NewTailClient(args Args) (*TailClient, error) {
 
 	c.init()
 	c.makeConnections(c)
+
 	return &c, nil
 }
 
@@ -37,8 +38,9 @@ func (c TailClient) makeHandler(server string) handlers.Handler {
 }
 
 func (c TailClient) makeCommands() (commands []string) {
+	options := fmt.Sprintf("quiet=%v", c.Args.Quiet)
 	for _, file := range strings.Split(c.What, ",") {
-		commands = append(commands, fmt.Sprintf("%s %s %s", c.Mode.String(), file, c.Regex.Serialize()))
+		commands = append(commands, fmt.Sprintf("%s:%s %s %s", c.Mode.String(), options, file, c.Regex.Serialize()))
 	}
 	logger.Debug(commands)
 
diff --git a/internal/color/colorfy.go b/internal/color/colorfy.go
index 9ae46f5..a2beb7a 100644
--- a/internal/color/colorfy.go
+++ b/internal/color/colorfy.go
@@ -41,16 +41,14 @@ func paintClientStats(line string) string {
 
 // Colorfy a given line based on the line's content.
 func Colorfy(line string) string {
-	if strings.HasPrefix(line, "REMOTE") {
+	switch {
+	case strings.HasPrefix(line, "REMOTE"):
 		return paintRemote(line)
-	}
-	if strings.HasPrefix(line, "CLIENT") && strings.Contains(line, "|stats|") {
+	case strings.HasPrefix(line, "CLIENT") && strings.Contains(line, "|stats|"):
 		return paintClientStats(line)
-	}
-	if strings.Contains(line, "ERROR") {
+	case strings.Contains(line, "ERROR"):
 		return Paint(Magenta, line)
-	}
-	if strings.Contains(line, "WARN") {
+	case strings.Contains(line, "WARN"):
 		return Paint(Magenta, line)
 	}
 
diff --git a/internal/config/common.go b/internal/config/common.go
index 103b390..c3e203e 100644
--- a/internal/config/common.go
+++ b/internal/config/common.go
@@ -2,10 +2,14 @@ package config
 
 // CommonConfig stores configuration keys shared by DTail server and client.
 type CommonConfig struct {
-	SSHPort                    int
+	// The SSH port number
+	SSHPort int
+	// Enable experimental features (mainly for dev purposes)
 	ExperimentalFeaturesEnable bool `json:",omitempty"`
-	DebugEnable                bool `json:",omitempty"`
-	TraceEnable                bool `json:",omitempty"`
+	// Enable debug logging. Don't enable in production.
+	DebugEnable bool `json:",omitempty"`
+	// Enable trace logging. Don't enable in production.
+	TraceEnable bool `json:",omitempty"`
 	// The log strategy to use, one of
 	//   stdout: only log to stdout (useful when used with systemd)
 	//   daily: create a log file for every day
diff --git a/internal/discovery/comma.go b/internal/discovery/comma.go
index 94276c7..4344240 100644
--- a/internal/discovery/comma.go
+++ b/internal/discovery/comma.go
@@ -1,8 +1,9 @@
 package discovery
 
 import (
-	"github.com/mimecast/dtail/internal/io/logger"
 	"strings"
+
+	"github.com/mimecast/dtail/internal/io/logger"
 )
 
 // ServerListFromCOMMA retrieves a list of servers from comma separated input list.
diff --git a/internal/discovery/file.go b/internal/discovery/file.go
index c04173e..1250755 100644
--- a/internal/discovery/file.go
+++ b/internal/discovery/file.go
@@ -2,8 +2,9 @@ package discovery
 
 import (
 	"bufio"
-	"github.com/mimecast/dtail/internal/io/logger"
 	"os"
+
+	"github.com/mimecast/dtail/internal/io/logger"
 )
 
 // ServerListFromFILE retrieves a list of servers from a file.
diff --git a/internal/io/fs/permissions/permission_linux.go b/internal/io/fs/permissions/permission_linux.go
index feae729..bbc039b 100644
--- a/internal/io/fs/permissions/permission_linux.go
+++ b/internal/io/fs/permissions/permission_linux.go
@@ -11,7 +11,7 @@ import (
 	"unsafe"
 )
 
-// To check whether user has Linux file system permissions to read a given file.
+// ToRead checks whether user has Linux file system permissions to read a given file.
 func ToRead(user, filePath string) (bool, error) {
 	cUser := C.CString(user)
 	cFilePath := C.CString(filePath)
diff --git a/internal/io/line/line.go b/internal/io/line/line.go
index 9db93c0..715be34 100644
--- a/internal/io/line/line.go
+++ b/internal/io/line/line.go
@@ -15,7 +15,11 @@ type Line struct {
 	// lines if that happens but it will signal to the client how
 	// many log lines in % could be transmitted to the client.
 	TransmittedPerc int
-	SourceID        string
+	// Contains the unique identifier of the source log file.
+	// It could be the name of the log or it could be one of the parent
+	// directories in case multiple log files with the same basename are
+	// followed.
+	SourceID string
 }
 
 // Return a human readable representation of the followed line.
diff --git a/internal/io/logger/logger.go b/internal/io/logger/logger.go
index b7db0a7..4254eef 100644
--- a/internal/io/logger/logger.go
+++ b/internal/io/logger/logger.go
@@ -72,12 +72,15 @@ type buf struct {
 func Start(ctx context.Context, mode Modes) {
 	Mode = mode
 
-	if Mode.Nothing {
+	switch {
+	case Mode.Nothing:
 		return
-	}
-
-	if Mode.Trace {
+	case Mode.Quiet:
+		Mode.Trace = false
+		Mode.Debug = false
+	case Mode.Trace:
 		Mode.Debug = true
+	default:
 	}
 
 	strategy := logStrategy()
@@ -87,7 +90,7 @@ func Start(ctx context.Context, mode Modes) {
 	case DailyStrategy:
 		_, err := os.Stat(config.Common.LogDir)
 		Mode.logToFile = !os.IsNotExist(err)
-		Mode.logToStdout = !Mode.Server || Mode.Debug || Mode.Trace
+		Mode.logToStdout = !Mode.Server || Mode.Debug || Mode.Trace || Mode.Quiet
 	case StdoutStrategy:
 		fallthrough
 	default:
@@ -131,11 +134,14 @@ func Info(args ...interface{}) string {
 
 // Warn message logging.
 func Warn(args ...interface{}) string {
-	if Mode.Server {
-		return log(serverStr, warnStr, args)
+	if !Mode.Quiet {
+		if Mode.Server {
+			return log(serverStr, warnStr, args)
+		}
+		return log(clientStr, warnStr, args)
 	}
 
-	return log(clientStr, warnStr, args)
+	return ""
 }
 
 // Error message logging.
@@ -242,7 +248,7 @@ func log(what string, severity string, args []interface{}) string {
 	message := strings.Join(messages, "|")
 	write(what, severity, message)
 
-	return message
+	return fmt.Sprintf("%s|%s", severity, message)
 }
 
 // Raw message logging.
diff --git a/internal/io/logger/modes.go b/internal/io/logger/modes.go
index 47dadfe..8864179 100644
--- a/internal/io/logger/modes.go
+++ b/internal/io/logger/modes.go
@@ -6,6 +6,7 @@ type Modes struct {
 	Trace       bool
 	Debug       bool
 	Nothing     bool
+	Quiet       bool
 	logToStdout bool
 	logToFile   bool
 }
diff --git a/internal/io/prompt/prompt.go b/internal/io/prompt/prompt.go
index a438d33..36ebdb5 100644
--- a/internal/io/prompt/prompt.go
+++ b/internal/io/prompt/prompt.go
@@ -3,9 +3,10 @@ package prompt
 import (
 	"bufio"
 	"fmt"
-	"github.com/mimecast/dtail/internal/io/logger"
 	"os"
 	"strings"
+
+	"github.com/mimecast/dtail/internal/io/logger"
 )
 
 // Answer is a user input of a prompt question.
@@ -18,8 +19,7 @@ type Answer struct {
 	Callback func()
 	// Runs after Callback and after logging resumes
 	EndCallback func()
-
-	AskAgain bool
+	AskAgain    bool
 }
 
 // Prompt used for interactive user input.
diff --git a/internal/io/run/run.go b/internal/io/run/run.go
deleted file mode 100644
index 2bb3756..0000000
--- a/internal/io/run/run.go
+++ /dev/null
@@ -1,150 +0,0 @@
-package run
-
-import (
-	"bufio"
-	"context"
-	"io"
-	"os/exec"
-	"sync"
-	"syscall"
-	"time"
-
-	"github.com/mimecast/dtail/internal/io/line"
-	"github.com/mimecast/dtail/internal/io/logger"
-)
-
-// Run is for execute a command.
-type Run struct {
-	command      string
-	args         []string
-	cmd          *exec.Cmd
-	pgroupKilled chan struct{}
-}
-
-// New returns a new command runner.
-func New(command string, args []string) Run {
-	return Run{
-		command: