package main
import "fmt"
import "os"
import "strconv"
func main() int{
arg_num := len(os.Args)
fmt.Printf("the num of input is %d\n",arg_num)
fmt.Printf("they are :\n")
for i := 0 ; i < arg_num ;i++{
fmt.Println(os.Args[i])
}
sum := 0
for i := 1 ; i < arg_num; i++{
curr,err := strconv.Atoi(os.Args[i])
if(err != nil){
fmt.Println("error happened ,exit")
return 1
}
sum += curr
}
fmt.Printf("sum of Args is %d\n",sum)
return 0
}
输出
manu@manu-hacks:~/code/go/self$ ./sum 1 2 4 the num of input is 4 they are : ./sum 1 2 4 sum of Args is 7 manu@manu-hacks:~/code/go/self$ ./sum 1 2 4 f 5 the num of input is 6 they are : ./sum 1 2 4 f 5 error happened ,exit
获取系统环境变量
package main
import "fmt"
import "os"
func main(){
environ := os.Environ()
for i := range environ {
fmt.Println(environ[i])
}
fmt.Println("------------------------------------------------------------\n")
logname := os.Getenv("LOGNAME")
fmt.Printf("logname is %s\n",logname)
}
输出
manu@manu-hacks:~/code/go/self$ go run env.go SSH_AGENT_PID=2331 GPG_AGENT_INFO=/tmp/keyring-5CkALe/gpg:0:1 TERM=xterm SHELL=/bin/bash 。。。 ------------------------------------------------------------ logname is manu
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