update install method

README.md

@@ -87,14 +87,18 @@ executable file of your operating system, and uncompress it with `tar -zxvf *.ta
 You can add the directory of the executable file to environment variable
 `PATH`, so you can run `csvtk` anywhere.
 
-1. For windows, the simplest way is copy it to `C:\WINDOWS\system32`.
+1. For Unix-like systems
+    1. If you have root privilege simply copy it to `/usr/local/bin`:
 
-2. For Linux, type:
+            sudo cp csvtk /usr/local/bin/
 
-        chmod a+x /PATH/OF/CSVTK/csvtk
-        echo export PATH=\$PATH:/PATH/OF/CSVTK >> ~/.bashrc
+    1. Or add the current directory of the executable file to environment variable
+    `PATH`:
 
-    or simply copy it to `/usr/local/bin`
+            echo export PATH=\$PATH:\"$(pwd)\" >> ~/.bashrc
+            source ~/.bashrc
+
+1. **For windows**, just copy `csvtk.exe` to `C:\WINDOWS\system32`.
 
 For Go developer, just one command:
 

csvtk/cmd/helper.go

@@ -51,7 +51,7 @@ func getFileList(args []string) []string {
 		files = append(files, "-")
 	} else {
 		for _, file := range files {
-			if file == "-" {
+			if isStdin(file) {
 				continue
 			}
 			if _, err := os.Stat(file); os.IsNotExist(err) {
@@ -590,3 +590,7 @@ type orderedFields []orderedField
 func (s orderedFields) Len() int           { return len(s) }
 func (s orderedFields) Less(i, j int) bool { return s[i].order < s[j].order }
 func (s orderedFields) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+func isStdin(file string) bool {
+	return file == "-"
+}

doc/docs/download.md

@@ -46,16 +46,16 @@ executable file of your operating system,
 and uncompress it with `tar -zxvf *.tar.gz` command or other tools.
 And then:
 
-1. **For Linux-like systems**
+1. For Unix-like systems
     1. If you have root privilege simply copy it to `/usr/local/bin`:
 
             sudo cp csvtk /usr/local/bin/
 
-    1. Or add the directory of the executable file to environment variable
+    1. Or add the current directory of the executable file to environment variable
     `PATH`:
 
-            echo export PATH=\$PATH:/PATH/OF/csvtk >> ~/.bashrc
-
+            echo export PATH=\$PATH:\"$(pwd)\" >> ~/.bashrc
+            source ~/.bashrc
 
 1. **For windows**, just copy `csvtk.exe` to `C:\WINDOWS\system32`.