go install go101.org/gotv@latest
gotv without any arguments to show help messages.
gotv commands are in the following format:
gotv ToolchainVersion [go-arguments...]
ToolchainVersion might be
1.17.13, 1.18, 1.19rc1, which mean the release tags go1.17.13, go1.18, go1.19rc1, respectively, in the Go git repository. Note:
1.N. means the latest release of 1.N (since Go toolchain 1.21, 1.N also means the latest release of 1.N).
1. means the latest Go 1 release version.
. means the latest Go release version.
:1.N, which means the local latest release-branch.go1.N branch in the Go git repository.
:tip, which means the local latest master branch in the Go git repository.
! means to fetch remote versions (by running gotv fetch-versions) firstly.
$ gotv 1.17. version
[Run]: $HOME/.cache/gotv/tag_go1.17.13/bin/go version
go version go1.17.13 linux/amd64
$ gotv 1.18.3 version
[Run]: $HOME/.cache/gotv/tag_go1.18.3/bin/go version
go version go1.18.3 linux/amd64
$ cat search.go
package main
import "fmt"
func demoFilter(n int) bool {
return n & 1 == 0;
}
// Search values and return them without perverting order.
func search(start, end int)(r []int) {
var count = 0
for i, index := start, 0; i <= end; i++ {
if demoFilter(i) {
count++
defer func(value int) {
r[index] = value
index++
}(i)
}
}
r = make([]int, count) // only allocate once
return
}
func main() {
fmt.Println(search(0, 9))
}
$ gotv 1.21 run search.go
[Run]: $HOME/.cache/gotv/tag_go1.21.7/bin/go run search.go
[8 6 4 2 0]
$ gotv 1.22 run search.go
[Run]: $HOME/.cache/gotv/tag_go1.22.1/bin/go run search.go
[0 0 0 0 0]
gotv specific commands:
# sync the local Go git repository with remote gotv fetch-versions # list all versions seen locally gotv list-versions # build and cache some toolchain versions gotv cache-version ToolchainVersion [ToolchainVersion ...] # uncache some toolchain versions to save disk space gotv uncache-version ToolchainVersion [ToolchainVersion ...] # pin a specified toolchain version at a stable path gotv pin-version ToolchainVersion # unpin the current pinned toolchain version gotv unpin-version # set the default toolchain version (since v0.2.1) gotv default-version ToolchainVersion # check the default toolchain version (since v0.2.1) gotv default-version
gotv pin-version command to pin a specific toolchain version to a stable path. After adding the stable path to the PATH environment veriable, we can use the official go command directly. And after doing these, the toolchain versions installed through ways other than GoTV may be safely uninstalled.
$ gotv pin-version 1.17. [Run]: cp -r $HOME/.cache/gotv/tag_go1.17.13 $HOME/.cache/gotv/pinned-toolchain Please put the following shown pinned toolchain path in your PATH environment variable to use go commands directly: /home/username/.cache/gotv/pinned-toolchain/bin
$ go version go version go1.17.13 linux/amd64
gotv pin-version .! will upgrade the pinned toolchain to the latest release version (which may be a beta or rc version).
PATH environment variable as the bootstrap version by default. If GOROOT_BOOTSTRAP environment variable is set, then its value will be used.
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