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logname.go
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logname.go
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/*
Go logname -- print user's login name
Copyright (C) 2015 Eric Lagergren
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Written by Eric Lagergren */
package main
import (
"fmt"
"log"
"os"
"github.com/EricLagergren/go-gnulib/login"
flag "github.com/ogier/pflag"
)
const (
HELP = `Usage: logname [OPTION]...
Print the name of the current user.
--help display this help and exit
--version output version information and exit
Report logname bugs to ericscottlagergren@gmail.com
Go coreutils home page: <https://www.github.com/EricLagergren/go-coreutils/>
`
VERSION = `logname (Go coreutils) 1.0
Copyright (C) 2015 Eric Lagergren
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Eric Lagergren
`
)
var (
version = flag.BoolP("version", "v", false, "print program version")
fatal = log.New(os.Stderr, "", 0)
//fatal = log.New(os.Stderr, "", log.Lshortfile)
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "%s", HELP)
os.Exit(0)
}
flag.Parse()
if *version {
fmt.Fprintf(os.Stderr, "%s", VERSION)
os.Exit(0)
}
name, err := login.GetLogin()
if err != nil {
// POSIX prohibits using a fallback
fatal.Fatalln("no login name")
}
fmt.Println(name)
}