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如何用golang处理文本小计
这篇文章主要介绍“如何用golang处理文本小计”，在日常操作中，相信很多人在如何用golang处理文本小计问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何用golang处理文本小计”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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很简单的解决方案，原文格式更加，见笑。
Env
linux 64bit
go version go1.7.4 linux/amd64
physical machine
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build)
任务
使用smartctl命令收集物理机上的硬盘信息。需要的硬盘信息如下：
date: ‘2016-02-09’, string
serial_number: MJ0351YNG9Z0XA, string
model: Hitachi HDS5C3030ALA630, string
capacity_bytes: 3000592982016, string
normalize: 100, int
raw: 32296, string
以上需要的信息都可以通过smartctl配合相关参数拿到，但是格式是很原始，需要我们根据需求抽取出真正需要的信息。
比如normalize和raw是硬盘的属性信息，可通过smartctl -A device获取：
➜ ~ sudo smartctl -A /dev/sda smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 118 099 006 Pre-fail Always - 199795992 3 Spin_Up_Time 0x0003 097 097 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 149 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0 7 Seek_Error_Rate 0x000f 077 060 030 Pre-fail Always - 54764573 9 Power_On_Hours 0x0032 089 089 000 Old_age Always - 9792 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 149 183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0 184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0 187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0 188 Command_Timeout 0x0032 100 099 000 Old_age Always - 2 2 2 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 190 Airflow_Temperature_Cel 0x0022 060 055 045 Old_age Always - 40 (Min/Max 26/40) 191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 25 193 Load_Cycle_Count 0x0032 098 098 000 Old_age Always - 4708 194 Temperature_Celsius 0x0022 040 045 000 Old_age Always - 40 (0 6 0 0 0) 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 9049h+51m+35.226s 241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 4749106878 242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 126575500815
厂商这类静态信息可通过sudo smartctl -i device获取：
➜ ~ sudo smartctl -i /dev/sda smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-327.36.2.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Seagate Barracuda 7200.14 (AF) Device Model: ST1000DM003-1ER162 Serial Number: W4Y3Z28A LU WWN Device Id: 5 000c50 08a2c464e Firmware Version: CC46 User Capacity: 1,000,204,886,016 bytes [1.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 7200 rpm Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Tue Feb 7 17:53:34 2017 CST ==> WARNING: A firmware update for this drive is available, see the following Seagate web pages: http://knowledge.seagate.com/articles/en_US/FAQ/207931en http://knowledge.seagate.com/articles/en_US/FAQ/223651en SMART support is: Available - device has SMART capability. SMART support is: Enabled
我们该如何把里面的数据抽取出来呢？
想到的方法
正则表达式
strings（golang stdlib）:处理字符串，分割、删除等
strconv (golang stdlib）：处理字符串转换。
os/exec：执行smartctl脚本，获取输出
注意事项
对于格式确定的文本，尽量根据格式过滤掉不需要的数据，只保留需要的数据。
lines := " data1\n data2\n needed1\n needed2\n needed := strings.Split(lines, " ")
对于分割，通常strings.Fields()优于strings.Split()。
package mainimport( "strings"
"fmt")func main() {
lines := "194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)"
useSplit(lines)
useFields(lines)
}func useSplit(lines string) {
line := strings.Split(lines, " ")
fmt.Println(line)
fmt.Println(len(line))
}func useFields(lines string) {
line := strings.Fields(lines)
fmt.Println(line)
fmt.Println(len(line))
}/*
output
➜ gist go run main.go
[194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)]
42
[194 Temperature_Celsius 0x0022 037 045 000 Old_age Always - 37 (0 6 0 0 0)]
15
*/exec获取bash script的输出信息默认结尾是带一个
\n换行符的，要记得处理掉:
package mainimport( "os/exec"
"os"
"fmt")func main() {
devices := getDevices()
fmt.Println(devices)
fmt.Println(len(devices))
}func getDevices() []string {
ret, err := exec.Command("/sbin/smartctl", "--scan").Output() if err != nil {
log.Println("Execute /sbin/smartctl --scan error: %v", err)
os.Exit(-1)
}
linest := strings.Split(string(ret), "\n")
lines := linest[:len(linest)-1] // remove last extra line with output of bash command
var devList = []string{} for _, line := range lines {
device := strings.Fields(line)[0]
devList = append(devList, device)
}
return devList
}/*
remove extra line
[/dev/sda]
1
not remove extra line
[/dev/sda ]
2
*/到此，关于“如何用golang处理文本小计”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！
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