Go Sh

like python-sh, for easy call shell with golang.
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wercker status Go Walker

If you depend on the old api, see tag: v.0.1

install: go get github.com/codeskyblue/go-sh

Pipe Example:

package main

import "github.com/codeskyblue/go-sh"

func main() {
	sh.Command("echo", "hello\tworld").Command("cut", "-f2").Run()

Because I like os/exec, go-sh is very much modelled after it. However, go-sh provides a better experience.

These are some of its features:

  • keep the variable environment (e.g. export)
  • alias support (e.g. alias in shell)
  • remember current dir
  • pipe command
  • shell build-in commands echo & test
  • timeout support

Examples are important:

sh: echo hello
go: sh.Command("echo", "hello").Run()

sh: export BUILD_ID=123
go: s = sh.NewSession().SetEnv("BUILD_ID", "123")

sh: alias ll='ls -l'
go: s = sh.NewSession().Alias('ll', 'ls', '-l')

sh: (cd /; pwd)
go: sh.Command("pwd", sh.Dir("/")).Run()

sh: test -d data || mkdir data
go: if ! sh.Test("dir", "data") { sh.Command("mkdir", "data").Run() }

sh: cat first second | awk '{print $1}'
go: sh.Command("cat", "first", "second").Command("awk", "{print $1}").Run()

sh: count=$(echo "one two three" | wc -w)
go: count, err := sh.Echo("one two three").Command("wc", "-w").Output()

sh(in ubuntu): timeout 1s sleep 3
go: c := sh.Command("sleep", "3"); c.Start(); c.WaitTimeout(time.Second) # default SIGKILL
go: out, err := sh.Command("sleep", "3").SetTimeout(time.Second).Output() # set session timeout and get output)

sh: echo hello | cat
go: out, err := sh.Command("cat").SetInput("hello").Output()

sh: cat # read from stdin
go: out, err := sh.Command("cat").SetStdin(os.Stdin).Output()

sh: ls -l > /tmp/listing.txt # write stdout to file
go: err := sh.Command("ls", "-l").WriteStdout("/tmp/listing.txt")

If you need to keep env and dir, it is better to create a session

session := sh.NewSession()
session.SetEnv("BUILD_ID", "123")
# then call cmd
session.Command("echo", "hello").Run()
# set ShowCMD to true for easily debug
session.ShowCMD = true

By default, pipeline returns error only if the last command exit with a non-zero status. However, you can also enable pipefail option like bash. In that case, pipeline returns error if any of the commands fail and for multiple failed commands, it returns the error of rightmost failed command.

session := sh.NewSession()
session.PipeFail = true
session.Command("cat", "unknown-file").Command("echo").Run()

By default, pipelines's std-error is set to last command's std-error. However, you can also combine std-errors of all commands into pipeline's std-error using session.PipeStdErrors = true.

for more information, it better to see docs. Go Walker


If you love this project, starring it will encourage the coder. Pull requests are welcome.

support the author: alipay


this project is based on codegangsta/inject. thanks for the author.

the reason to use Go shell

Sometimes we need to write shell scripts, but shell scripts are not good at working cross platform, Go, on the other hand, is good at that. Is there a good way to use Go to write shell like scripts? Using go-sh we can do this now.

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