golang处理文本小计

➜  ~ 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

➜  ~ 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/223651enSMART support is: Available - device has SMART capability.
SMART support is: Enabled

lines := "
   data1\n data2\n needed1\n needed2\n
needed := strings.Split(lines, " ")

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
*/

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
*/