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Revision 1 as of 10/14/2017 22:40 ▼
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Revision 6 as of 10/14/2017 23:22 ▼
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1 %%(html) 1 **go** in **archlinux**
    2
    3 %%(html5)
    4
    5 $ sudo pacman -S go go-tools
    6
2 7
3 $ go version 8 $ go version
4 go version go1.9.1 linux/amd64 9 go version go1.9.1 linux/amd64
… … … …
10 import "fmt" 15 import "fmt"
11 // This is a demonstrative comment! 16 // This is a demonstrative comment!
12 func main() { 17 func main() {
13    fmt.Println("Hello World!") 18 fmt.Println("Hello World!")
14 } 19 }
15 EOF 20 EOF
16 21
    22 %%
    23
    24 %%
17 $ go run helloworld.go 25 $ go run helloworld.go
18 fork/exec /tmp/go-build127438955/command-line-arguments/_obj/exe/helloworld: permission denied 26 fork/exec /tmp/go-build127438955/command-line-arguments/_obj/exe/helloworld: permission denied
19 27
… … … …
24 32
25 $ go run helloworld.go 33 $ go run helloworld.go
26 Hello World! 34 Hello World!
    35 %%
    36
    37 %%
    38
    39 $ cat helloworld.go
    40 package main
    41 import "fmt"
    42 // This is a demonstrative comment!
    43 func main() {
    44 fmt.Println("Hello World!")
    45 }
    46 %%
    47
    48 %%
    49 $ gofmt helloworld.go
    50 package main
    51
    52 import "fmt"
    53
    54 // This is a demonstrative comment!
    55 func main() {
    56     fmt.Println("Hello World!")
    57 }
    58
    59 %%
    60
    61 %%
    62
    63 $ godoc fmt | head
    64 use 'godoc cmd/fmt' for documentation on the fmt command
    65
    66 PACKAGE DOCUMENTATION
    67
    68 package fmt
    69     import "fmt"
    70
    71 %%
    72
    73 %%
    74 ## The Go Programming Language - documentation in web server !
    75
    76 $ godoc -http=:8181
    77 %%
    78
    79 %%
    80
    81 ## Go uses static linking by default
    82 $ go build helloworld.go
    83
    84 $ ls -l
    85 total 752
    86 -rwxr-x--- 1 ebal ebal 1855827 Oct 14 23:07 helloworld
    87 -rw-r----- 1 ebal ebal 109 Oct 14 23:05 helloworld.go
    88
    89 $ ./helloworld
    90 Hello World!
    91
    92 $ file helloworld
    93 helloworld: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, with debug_info, not stripped
    94
    95 $ ldd helloworld
    96     not a dynamic executable
    97
    98 $ strip helloworld
    99
    100 $ ldd helloworld
    101     not a dynamic executable
    102
    103 $ ls -l helloworld
    104 -rwxr-x--- 1 ebal ebal 1226248 Oct 14 23:14 helloworld
27 105
28 106
    107 ## From 1855827 ~~> 1226248
    108
    109 $ file helloworld
    110 helloworld: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped
    111
29 %% 112 %%
    113
    114 %%
    115
    116 ## Variables
    117
    118 GOROOT
    119 GOHOME
    120 GOBIN
    121 GOPATH
    122
    123 %%
    124
    125 %%
    126
    127 $ go help environment | head -5
    128
    129 The go command, and the tools it invokes, examine a few different
    130 environment variables. For many of these, you can see the default
    131 value of on your system by running 'go env NAME', where NAME is the
    132 name of the variable.
    133
    134 %%
    135
    136 %%
    137
    138 $ gofmt test.go
    139 package main
    140
    141 import (
    142     "fmt"
    143     "os"
    144 )
    145
    146 func main() {
    147     arguments := os.Args
    148     for i := 0; i < len(arguments); i++ {
    149         fmt.Println(arguments[i])
    150     }
    151 }
    152
    153
    154 $ go run test.go 1 2
    155 TMPDIR/go-build729121647/command-line-arguments/_obj/exe/test
    156 1
    157 2
    158
    159 %%
    160