Package system contains some functions about os, runtime, shell command.
import (
"github.com/duke-git/lancet/v2/system"
)
Check if current os is windows.
Signature:
func IsWindows() bool
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
isOsWindows := system.IsWindows()
fmt.Println(isOsWindows)
}
Check if current os is linux.
Signature:
func IsLinux() bool
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
isOsLinux := system.IsLinux()
fmt.Println(isOsLinux)
}
Check if current os is macos.
Signature:
func IsMac() bool
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
isOsMac := system.IsMac()
fmt.Println(isOsMac)
}
Gets the value of the environment variable named by the key.
Signature:
func GetOsEnv(key string) string
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
err := system.SetOsEnv("foo", "abc")
result := system.GetOsEnv("foo")
fmt.Println(err)
fmt.Println(result)
// Output:
// <nil>
// abc
}
Sets the value of the environment variable named by the key.
Signature:
func SetOsEnv(key, value string) error
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
err := system.SetOsEnv("foo", "abc")
result := system.GetOsEnv("foo")
fmt.Println(err)
fmt.Println(result)
// Output:
// <nil>
// abc
}
Remove a single environment variable.
Signature:
func RemoveOsEnv(key string) error
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
err1 := system.SetOsEnv("foo", "abc")
result1 := GetOsEnv("foo")
err2 := system.RemoveOsEnv("foo")
result2 := GetOsEnv("foo")
fmt.Println(err1)
fmt.Println(err2)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// <nil>
// <nil>
// abc
//
}
Get env named by the key and compare it with comparedEnv.
Signature:
func CompareOsEnv(key, comparedEnv string) bool
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
err := system.SetOsEnv("foo", "abc")
if err != nil {
return
}
result := system.CompareOsEnv("foo", "abc")
fmt.Println(result)
// Output:
// true
}
Execute shell command, return the stdout and stderr string of command, and error if error occur. param `command` is a complete command string, like, ls -a (linux), dir(windows), ping 127.0.0.1. In linux, use /bin/bash -c to execute command, In windows, use powershell.exe to execute command.
Signature:
type (
Option func(*exec.Cmd)
)
func ExecCommand(command string, opts ...Option) (stdout, stderr string, err error)
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
// linux or mac
stdout, stderr, err := system.ExecCommand("ls")
fmt.Println("std out: ", stdout)
fmt.Println("std err: ", stderr)
assert.Equal("", stderr)
// windows
stdout, stderr, err = system.ExecCommand("dir")
fmt.Println("std out: ", stdout)
fmt.Println("std err: ", stderr)
// error command
stdout, stderr, err = system.ExecCommand("abc")
fmt.Println("std out: ", stdout)
fmt.Println("std err: ", stderr)
if err != nil {
fmt.Println(err.Error())
}
}
Get current os bits, 32bit or 64bit. return 32 or 64
Signature:
func GetOsBits() int
Example:Run
import (
"fmt"
"github.com/duke-git/lancet/v2/system"
)
func main() {
osBit := system.GetOsBits()
fmt.Println(osBit) // 32 or 64
}