Golang getting command-line arguments and environment variables

This is a creation in Article, where the information may have evolved or changed.

package mainimport  "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}

Output

manu@manu-hacks:~/code/go/self$./sum 1 2 4 The num of input is 4they be:./sum124sum of Args is 7manu@manu-hacks:~/code/ go/self$./sum 1 2 4 F 5 The num of input is 6they be:./sum124f5error happened, exit

Get System Environment variables

Package Mainimport "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)}

Output

manu@manu-hacks:~/code/go/self$ Go run env.go ssh_agent_pid=2331gpg_agent_info=/tmp/keyring-5ckale/gpg:0:1term= Xtermshell=/bin/bash ... ------------------------------------------------------------LogName is Manu