Difference between revisions for go





Revision 1 as of 10/14/2017 22:40 ▼
5 10/14/2017 23:09 EvaggelosBalaskas 4 10/14/2017 23:08 EvaggelosBalaskas 3 10/14/2017 22:51 EvaggelosBalaskas 2 10/14/2017 22:47 EvaggelosBalaskas 1 10/14/2017 22:40 EvaggelosBalaskas

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Revision 6 as of 10/14/2017 23:22 ▼
7 10/14/2017 23:29 EvaggelosBalaskas 6 10/14/2017 23:22 EvaggelosBalaskas 5 10/14/2017 23:09 EvaggelosBalaskas 4 10/14/2017 23:08 EvaggelosBalaskas 3 10/14/2017 22:51 EvaggelosBalaskas 2 10/14/2017 22:47 EvaggelosBalaskas

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EvaggelosBalaskas

Merge of Version1 & Version2
1 **go** in **archlinux**
2
3 %%(html5)
4
5 $ sudo pacman -S go go-tools
6
7
8 $ go version
9 go version go1.9.1 linux/amd64
… …
15 import "fmt"
16 // This is a demonstrative comment!
17 func main() {
18    fmt.Println("Hello World!")
19 }
20 EOF
21
22 %%
23
24 %%
25 $ go run helloworld.go
26 fork/exec /tmp/go-build127438955/command-line-arguments/_obj/exe/helloworld: permission denied
27
… …
32
33 $ go run helloworld.go
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
105
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
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