执行时：
root@imx6slzbha:~# iw wlan0 scan
我收到以下输出信息，它为我提供了多个附近的SSID数据。
如何根据特定的SSID名称获取信号强度？
目前，我正在使用此命令基于BSS获取：
iw wlan0 scan | sed -n '/bc:d1:1f:16:55:c7/,/WMM/p' | grep signal | sed 's/.*-//' | awk '{print $1}' | cut -d . -f 1
但我可能每次都不知道BSS，因此需要对此要求作出通用答案。enter image description here
BSS c8:00:84:85:41:b1 (on wlan0)
TSF: 4138861160471 usec (47d, 21:41:01)
freq: 2462
beacon interval: 102
capability: ESS ShortPreamble ShortSlotTime (0x1421)
signal: -80.00 dBm
last seen: 90 ms ago
SSID: Swarovski_Guest
Supported rates: 1.0* 2.0* 5.5* 6.0 9.0 11.0* 12.0 18.0
DS Parameter set: channel 11
Country: IN Environment: Indoor/Outdoor
Channels [1 - 11] @ 30 dBm
ERP: <no flags>
HT capabilities:
Capabilities: 0x19ac
HT20
SM Power Save disabled
RX HT20 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 7935 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 8 usec (0x06)
HT RX MCS rate indexes supported: 0-23
HT TX MCS rate indexes are undefined
Extended supported rates: 24.0 36.0 48.0 54.0
HT operation:
* primary channel: 11
* secondary channel offset: no secondary
* STA channel width: 20 MHz
* RIFS: 0
* HT protection: nonmember
* non-GF present: 1
* OBSS non-GF present: 0
* dual beacon: 0
* dual CTS protection: 0
* STBC beacon: 0
* L-SIG TXOP Prot: 0
* PCO active: 0
* PCO phase: 0
Extended capabilities: 4, 6
WMM: * Parameter version 1
* u-APSD
* BE: CW 15-1023, AIFSN 3
* BK: CW 15-1023, AIFSN 7
* VI: CW 7-15, AIFSN 2, TXOP 3008 usec
* VO: acm CW 3-7, AIFSN 2, TXOP 1504 usec
BSS a0:ab:1b:cf:28:ae (on wlan0)
TSF: 3196211626 usec (0d, 00:53:16)
freq: 2462
beacon interval: 100
capability: ESS Privacy ShortPreamble ShortSlotTime (0x0431)
signal: -74.00 dBm
last seen: 80 ms ago
Information elements from Probe Response frame:
SSID: FOTA_Rashmi_2.4G
Supported rates: 1.0* 2.0* 5.5* 11.0* 9.0 18.0 36.0 54.0
DS Parameter set: channel 11
Extended supported rates: 6.0 12.0 24.0 48.0
Country: EU Environment: Indoor/Outdoor
Channels [1 - 13] @ 20 dBm
TIM: DTIM Count 0 DTIM Period 1 Bitmap Control 0x0 Bitmap[0] 0x2
WPS: * Version: 1.0
* Wi-Fi Protected Setup State: 2 (Configured)
* UUID: 28802880-2880-1880-a880-a0ab1bcf28ae
* RF Bands: 0x1
* Unknown TLV (0x1049, 6 bytes): 00 37 2a 00 01 20
ERP: <no flags>
HT capabilities:
Capabilities: 0x11ee
HT20/HT40
SM Power Save disabled
RX HT20 SGI
RX HT40 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 4 usec (0x05)
HT RX MCS rate indexes supported: 0-15, 32
HT TX MCS rate indexes are undefined
HT operation:
* primary channel: 11
* secondary channel offset: no secondary
* STA channel width: 20 MHz
* RIFS: 0
* HT protection: nonmember
* non-GF present: 0
* OBSS non-GF present: 0
* dual beacon: 0
* dual CTS protection: 0
* STBC beacon: 0
* L-SIG TXOP Prot: 0
* PCO active: 0
* PCO phase: 0
Extended capabilities: HT Information Exchange Supported
WPA: * Version: 1
* Group cipher: TKIP
* Pairwise ciphers: TKIP CCMP
* Authentication suites: PSK
RSN: * Version: 1
* Group cipher: TKIP
* Pairwise ciphers: TKIP CCMP
* Authentication suites: PSK
* Capabilities: (0x0000)
WMM: * Parameter version 1
* BE: CW 15-1023, AIFSN 3
* BK: CW 15-1023, AIFSN 7
* VI: CW 7-15, AIFSN 2, TXOP 3008 usec
* VO: CW 3-7, AIFSN 2, TXOP 1504 usec
答案 0 :(得分：1)
为了使用给定的SSID，例如“Swarovski_Guest”你可以：
sed -n '/signal/h;/SSID: Swarovski_Guest/{x;s/^.*: -\(.*\) dBm$/\1/;p}'
/signal/ h; /SSID: Swarovski_Guest/ x; s/^.*: -\(.*\) dBm$/\1/; p 样本输入的输出：
80.00