1diff --git a/Makefile b/Makefile
  2index 085fefb..40a9cf8 100644
  3--- a/Makefile
  4+++ b/Makefile
  5@@ -21,24 +21,24 @@ build: Makefile target target/output  target/gshr.bin
  6 
  7 dev: Makefile target target/output  target/gshr.bin
  8 	./target/gshr.bin \
  9-    --config=$(PWD)/gshr.toml \
 10-    --output=$(PWD)/target/output \
 11+    -c=gshr.toml \
 12+    -o=target/output \
 13 		&& \
 14     cd $(PWD)/target/output && \
 15     python3 -m http.server 8000
 16 
 17 dev-example-go-git: Makefile target target/output  target/gshr.bin
 18 	./target/gshr.bin \
 19-    --config=$(PWD)/examples/go-git.toml \
 20-    --output=$(PWD)/target/output \
 21+    -c=$(PWD)/examples/go-git.toml \
 22+    -c=$(PWD)/target/output \
 23 		&& \
 24     cd $(PWD)/target/output && \
 25     python3 -m http.server 8000
 26 
 27 dev-example-gshr: Makefile target target/output  target/gshr.bin
 28 	./target/gshr.bin \
 29-    --config=$(PWD)/examples/ghsr-simple.toml \
 30-    --output=$(PWD)/target/output \
 31+    -c=$(PWD)/examples/ghsr-simple.toml \
 32+    -o=$(PWD)/target/output \
 33 		&& \
 34     cd $(PWD)/target/output && \
 35     python3 -m http.server 8000
 36diff --git a/README.md b/README.md
 37index 1849107..865a397 100644
 38--- a/README.md
 39+++ b/README.md
 40@@ -32,12 +32,9 @@ See more examples in [tree/master/examples](tree/master/examples).
 41 
 42 ```
 43 Usage of gshr:
 44-  -config string
 45-    	Config file.
 46-  -output string
 47-    	Dir of output.
 48-  -silent
 49-    	Run in silent mode.
 50+  -c Config file.
 51+  -o Dir of output.
 52+  -s Run in silent mode.
 53 ```
 54 
 55 The toml file needs to be in the format:
 56diff --git a/main.go b/main.go
 57index 58493a4..4d2f8c3 100644
 58--- a/main.go
 59+++ b/main.go
 60@@ -10,6 +10,7 @@ import (
 61 	"os"
 62 	"os/exec"
 63 	"path"
 64+	"strings"
 65 
 66 	"github.com/alecthomas/chroma/formatters/html"
 67 	"github.com/alecthomas/chroma/lexers"
 68@@ -56,14 +57,28 @@ func Init() {
 69 	log.SetOutput(new(LogWriter))
 70 	args = DefaultCmdArgs()
 71 	settings = DefaultSettings()
 72-	flag.StringVar(&args.ConfigFile, "config", "", "Config file.")
 73-	flag.StringVar(&args.OutputDir, "output", "", "Dir of output.")
 74-	flag.BoolVar(&args.Silent, "silent", false, "Run in silent mode.")
 75+	pwd, err := os.Getwd()
 76+	checkErr(err)
 77+	args.Wd = pwd
 78+	flag.StringVar(&args.ConfigPath, "c", "", "Config file.")
 79+	flag.StringVar(&args.OutputDir, "o", "", "Dir of output.")
 80+	flag.BoolVar(&args.Silent, "s", false, "Run in silent mode.")
 81 	flag.Parse()
 82+	debug("working dir '%v'", args.Wd)
 83+
 84+	if !strings.HasPrefix(args.ConfigPath, "/") {
 85+		args.ConfigPath = path.Join(args.Wd, args.ConfigPath)
 86+		checkFile(args.ConfigPath)
 87+	}
 88 
 89-	debug("config '%v'", args.ConfigFile)
 90+	if !strings.HasPrefix(args.OutputDir, "/") {
 91+		args.OutputDir = path.Join(args.Wd, args.OutputDir)
 92+		checkDir(args.OutputDir)
 93+	}
 94+
 95+	debug("config '%v'", args.ConfigPath)
 96 	debug("output '%v'", args.OutputDir)
 97-	configFileBytes, err := os.ReadFile(args.ConfigFile)
 98+	configFileBytes, err := os.ReadFile(args.ConfigPath)
 99 	configString := string(configFileBytes)
100 	checkErr(err)
101 	config = ParseConfiguration(configString)
102@@ -129,6 +144,16 @@ func checkErr(err error) {
103 	}
104 }
105 
106+func checkFile(filename string) {
107+	_, err := os.Stat(filename)
108+	checkErr(err)
109+}
110+
111+func checkDir(dir string) {
112+	_, err := os.ReadDir(dir)
113+	checkErr(err)
114+}
115+
116 func debug(format string, a ...any) {
117 	if !args.Silent {
118 		log.Printf("DEBUG: "+format, a...)
119@@ -158,14 +183,15 @@ func highlight(pathOrExtension string, data *string) string {
120 
121 type CmdArgs struct {
122 	Silent     bool
123-	ConfigFile string
124+	Wd         string
125+	ConfigPath string
126 	OutputDir  string
127 }
128 
129 func DefaultCmdArgs() CmdArgs {
130 	return CmdArgs{
131 		Silent:     true,
132-		ConfigFile: "",
133+		ConfigPath: "",
134 		OutputDir:  "",
135 	}
136 }