Linux 期望脚本有时以“连接被外国主机关闭”结尾，这是期望脚本还是设备问题？
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【中文标题】Linux 期望脚本有时以“连接被外国主机关闭”结尾，这是期望脚本还是设备问题？【英文标题】：Linux expect script sometimes ending with `Connection closed by foreign host`, is this expect script or device issue? 【发布时间】：2020-05-30 18:45:31 【问题描述】：我正在运行 CentOS 7.6
$ cat /etc/system-release
CentOS Linux release 7.6.1810 (Core)
这是来自 repos 的最新版本的期望。
$ expect -version
expect version 5.45
根据您的建议，我已经调整了我的代码以使其更易于修复，身份验证部分应该不是问题，所以我现在将其删除，下面是我的预期代码，测试没有身份验证的设备。
$ cat runCommands.exp
spawn telnet 10.220.64.67
set prompt "#"
expect ">"
send "enable\r"
expect $prompt
send "terminal length 200\r"
expect $prompt
send "terminal more off\r"
expect $prompt
send "show hw-inventory details\r"
expect $prompt
send "exit\r"
expect eof
这就是我运行期望脚本的方式，它可以正确启动，但最后会停止。
$ expect -f ./runCommands.exp
spawn telnet 10.220.64.67
Trying 10.220.64.67...
Connected to 10.220.64.67.
Escape character is '^]'.
******************************************************************
* *
* Tellabs 8609 Network Element *
* *
* Copyright (c) 2004-2015 Tellabs. All rights reserved. *
* *
******************************************************************
Enter configuration commands, one per line. End with ^Z
HENKEL_CAPITAL_2-EQU>enable
HENKEL_CAPITAL_2-EQU#terminal length 200
HENKEL_CAPITAL_2-EQU#terminal more off
HENKEL_CAPITAL_2-EQU#show hw-inventory details
This is node 1643 of type 8609 and subrack address 0.
unit in slot 1 is part of inventory and UP AND RUNNING
unit 1 of width 1 has serial number 40601444713, CLEI code IPMVU00DRB
top level serial number 40601445792
manufacturing date 2016-3-30, 4:42:19.0, +0:00
part# 82.86S-8609-R6 rev C
HW type sbb2284-8609(2284) v3.0.1 SW type 0 v2.0.331
Pmax=70.0W, Ptyp=60.0W
infomodel FP2.0 (2.2.0); internal SW v.2.0.331
Supported infomodels:
FP2.0 (2.2.0)
CPLD active revision: 0x0130
WPIF expected and active revision: 0x001a
LMIF expected and active revision: 0x0023
TOCK expected and active revision: 0x0416
module IF0 (LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 52
[15] link length for 9/125mm fiber (100m): 255
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: FINISAR CORP.
[37] vendor organizationally unique: 36965
[40] vendor part number: FTLF1419P1BCL-TL
[56] vendor revision number: A
[60] Laser wavelength: 1310 nm
[62] reserved field: 0
[68] vendor serial number: PU117T5
[84] vendor's date (yy-mm-dd): 15-07-03
[90] vendor's date (vendor specific part):
[224-241] Tellabs part number: 81.86T-S001-13S-R6
[242-243] Tellabs revision: A
[244-253] Tellabs CLEI code: IPU3AVSKAA
[255] Tellabs checksum: 0x3C
[d102] Tx power: 2.6 dBm (1.8 mW)
[d104] Rx power: -7.8 dBm (0.17 mW)
SFP connector 1 is not present
SFP connector 2 is not present
SFP connector 3 is not present
module IF1 (MIDDLE LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 40
[15] link length for 9/125mm fiber (100m): 0
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: HG GENUINE
[37] vendor organizationally Connection closed by foreign host.
正如您在上面看到的，我得到的错误是 Connection closed by foreign host 我无法获得 show hw-inventory details 命令的完整输出 ，不确定输出的大小是否会影响这一点。
作为我知道的用于调试此期望脚本的唯一资源是添加 -d 标志，我已经使用该选项运行完全相同的脚本，以防我们了解这里发生了什么.
$ expect -df ./runCommands.exp
expect version 5.45
argv[0] = expect argv[1] = -df argv[2] = ./runCommands.exp
set argc 0
set argv0 "./runCommands.exp"
set argv ""
executing commands from command file ./runCommands.exp
spawn telnet 10.220.64.67
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns 15767
expect: does "" (spawn_id exp6) match glob pattern ">"? no
Trying 10.220.64.67...
expect: does "Trying 10.220.64.67...\r\r\n" (spawn_id exp6) match glob pattern ">"? no
Connected to 10.220.64.67.
Escape character is '^]'.
expect: does "Trying 10.220.64.67...\r\r\nConnected to 10.220.64.67.\r\r\nEscape character is '^]'.\r\r\n" (spawn_id exp6) match glob pattern ">"? no
******************************************************************
* *
* Tellabs 8609 Network Element *
* *
* Copyright (c) 2004-2015 Tellabs. All rights reserved. *
* *
******************************************************************
Enter configuration commands, one per line. End with ^Z
HENKEL_CAPITAL_2-EQU>
expect: does "Trying 10.220.64.67...\r\r\nConnected to 10.220.64.67.\r\r\nEscape character is '^]'.\r\r\n\r\r\n******************************************************************\r\r\n* *\r\r\n* Tellabs 8609 Network Element *\r\r\n* *\r\r\n* Copyright (c) 2004-2015 Tellabs. All rights reserved. *\r\r\n* *\r\r\n******************************************************************\r\r\nEnter configuration commands, one per line. End with ^Z\r\nHENKEL_CAPITAL_2-EQU>" (spawn_id exp6) match glob pattern ">"? yes
expect: set expect_out(0,string) ">"
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "Trying 10.220.64.67...\r\r\nConnected to 10.220.64.67.\r\r\nEscape character is '^]'.\r\r\n\r\r\n******************************************************************\r\r\n* *\r\r\n* Tellabs 8609 Network Element *\r\r\n* *\r\r\n* Copyright (c) 2004-2015 Tellabs. All rights reserved. *\r\r\n* *\r\r\n******************************************************************\r\r\nEnter configuration commands, one per line. End with ^Z\r\nHENKEL_CAPITAL_2-EQU>"
send: sending "enable\r" to exp6
expect: does "" (spawn_id exp6) match glob pattern "#"? no
HENKEL_CAPITAL_2-EQU>
expect: does "\r \u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008HENKEL_CAPITAL_2-EQU>" (spawn_id exp6) match glob pattern "#"? no
enable
expect: does "\r \u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008HENKEL_CAPITAL_2-EQU>enable\r\n" (spawn_id exp6) match glob pattern "#"? no
HENKEL_CAPITAL_2-EQU#
expect: does "\r \u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008HENKEL_CAPITAL_2-EQU>enable\r\nHENKEL_CAPITAL_2-EQU#" (spawn_id exp6) match glob pattern "#"? yes
expect: set expect_out(0,string) "#"
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "\r \u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008\u0008HENKEL_CAPITAL_2-EQU>enable\r\nHENKEL_CAPITAL_2-EQU#"
send: sending "terminal length 200\r" to exp6
expect: does "" (spawn_id exp6) match glob pattern "#"? no
terminal length 200
expect: does "terminal length 200\r\n" (spawn_id exp6) match glob pattern "#"? no
HENKEL_CAPITAL_2-EQU#
expect: does "terminal length 200\r\nHENKEL_CAPITAL_2-EQU#" (spawn_id exp6) match glob pattern "#"? yes
expect: set expect_out(0,string) "#"
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "terminal length 200\r\nHENKEL_CAPITAL_2-EQU#"
send: sending "terminal more off\r" to exp6
expect: does "" (spawn_id exp6) match glob pattern "#"? no
terminal more off
expect: does "terminal more off\r\n" (spawn_id exp6) match glob pattern "#"? no
HENKEL_CAPITAL_2-EQU#
expect: does "terminal more off\r\nHENKEL_CAPITAL_2-EQU#" (spawn_id exp6) match glob pattern "#"? yes
expect: set expect_out(0,string) "#"
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "terminal more off\r\nHENKEL_CAPITAL_2-EQU#"
send: sending "show hw-inventory details\r" to exp6
expect: does "" (spawn_id exp6) match glob pattern "#"? no
show hw-inventory details
expect: does "show hw-inventory details\r\n" (spawn_id exp6) match glob pattern "#"? no
This is node 1643 of type 8609 and subrack address 0.
unit in slot 1 is pa
expect: does "show hw-inventory details\r\nThis is node 1643 of type 8609 and subrack address 0.\r\n unit in slot 1 is pa" (spawn_id exp6) match glob pattern "#"? no
r
expect: does "show hw-inventory details\r\nThis is node 1643 of type 8609 and subrack address 0.\r\n unit in slot 1 is par" (spawn_id exp6) match glob pattern "#"? no
t of inventory and UP AND RUNNING
unit 1 of width 1 has serial number 4
expect: does "show hw-inventory details\r\nThis is node 1643 of type 8609 and subrack address 0.\r\n unit in slot 1 is part of inventory and UP AND RUNNING\r\n unit 1 of width 1 has serial number 4" (spawn_id exp6) match glob pattern "#"? no
0601444713, CLEI code IPMVU00DRB
top level serial number 40601445792
manufacturing date 2016-3-30, 4:42:19.0, +0:00
part# 82.86S-8609
expect: does "show hw-inventory details\r\nThis is node 1643 of type 8609 and subrack address 0.\r\n unit in slot 1 is part of inventory and UP AND RUNNING\r\n unit 1 of width 1 has serial number 40601444713, CLEI code IPMVU00DRB\r\n top level serial number 40601445792\r\n manufacturing date 2016-3-30, 4:42:19.0, +0:00\r\n part# 82.86S-8609" (spawn_id exp6) match glob pattern "#"? yes
expect: set expect_out(0,string) "#"
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "show hw-inventory details\r\nThis is node 1643 of type 8609 and subrack address 0.\r\n unit in slot 1 is part of inventory and UP AND RUNNING\r\n unit 1 of width 1 has serial number 40601444713, CLEI code IPMVU00DRB\r\n top level serial number 40601445792\r\n manufacturing date 2016-3-30, 4:42:19.0, +0:00\r\n part#"
send: sending "exit\r" to exp6
-R6 rev C
HW type sbb2284-8609(2284) v3.0.1 SW type 0 v2.0.331
Pmax=70.0W, Ptyp=60.0W
infomodel FP2.0 (2.2.0); internal SW v.2.0.331
Supported infomodels:
FP2.0 (2.2.0)
CPLD active revision: 0x0130
WPIF expected and active revision: 0x001a
LMIF expected and active revision: 0x0023
TOCK expected and active revision: 0x0416
module IF0 (LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 52
[15] link length for 9/125mm fiber (100m): 255
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: FINISAR CORP.
[37] vendor organizationally unique: 36965
[40] vendor part number: FTLF1419P1BCL-TL
[56] vendor revision number: A
[60] Laser wavelength: 1310 nm
[62] reserved field: 0
[68] vendor serial number: PU117T5
[84] vendor's date (yy-mm-dd): 15-07-03
[90] vendor's date (vendor specific part):
[224-241] Tellabs part number: 81.86T-S001-13S-R6
[242-243] Tellabs revision: A
[244-253] Tellabs CLEI code: IPU3AVSKAA
[255] Tellabs checksum: 0x3C
[d102] Tx power: 2.6 dBm (1.8 mW)
[d104] Rx power: -7.7 dBm (0.17 mW)
SFP connector 1 is not present
SFP connector 2 is not present
SFP connector 3 is not present
module IF1 (MIDDLE LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 40
[15] link length for 9/125mm fiber (100m): 0
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: HG GENUINE
[37] vendor organizationally unique: 0
[40] vendor part number: MXPD-243MD
[56] vendor revision number:
[60] Laser wavelength: 1310 nm
[62] reserved field: 0
[68] vendor serial number: ME12112000011
[84] vendor's date (yy-mm-dd): 12-03-17
[90] vendor's date (vendor specific part):
[224-255] vendor specific ID field : 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000
[d102] Tx power: -3.0 dBm (0.50 mW)
[d104] Rx power: -13 dBm (50 uW)
SFP connector 1 is not present
SFP connector 2 is Connection closed by foreign host.
expect: read eof
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) " 82.86S-8609-R6 rev C\r\n HW type sbb2284-8609(2284) v3.0.1 SW type 0 v2.0.331\r\n Pmax=70.0W, Ptyp=60.0W\r\n infomodel FP2.0 (2.2.0); internal SW v.2.0.331\r\n Supported infomodels:\r\n FP2.0 (2.2.0)\r\n CPLD active revision: 0x0130\r\n WPIF expected and active revision: 0x001a\r\n LMIF expected and active revision: 0x0023\r\n TOCK expected and active revision: 0x0416\r\n module IF0 (LEFT) of type 4*100/1000BASE-X(9094)\r\n SFP connector 0 data:\r\n [0] type of serial transceiver: 3 (SFP transceiver)\r\n [1] extended identifier of type of serial transceiver: 4\r\n [2] connector type: 7(LC)\r\n [3] infiniband compliance code: 0\r\n [4] sonet compliance code4: 0\r\n [5] sonet compliance code5: 0\r\n [6] gigabit ethernet compliance code: 2, 1000BASE-LX\r\n [11] serial encoding type: 1 8B10B\r\n [14] link length for 9/125mm fiber (km): 52\r\n [15] link length for 9/125mm fiber (100m): 255\r\n [16] link length for 50/125mm fiber (10m): 0\r\n [17] link length for 62.5/125mm fiber (10m): 0\r\n [18] link length for copper (m): 0\r\n [20] vendor name: FINISAR CORP. \r\n [37] vendor organizationally unique: 36965\r\n [40] vendor part number: FTLF1419P1BCL-TL\r\n [56] vendor revision number: A \r\n [60] Laser wavelength: 1310 nm\r\n [62] reserved field: 0\r\n [68] vendor serial number: PU117T5 \r\n [84] vendor's date (yy-mm-dd): 15-07-03\r\n [90] vendor's date (vendor specific part): \r\n [224-241] Tellabs part number: 81.86T-S001-13S-R6\r\n [242-243] Tellabs revision: A \r\n [244-253] Tellabs CLEI code: IPU3AVSKAA\r\n [255] Tellabs checksum: 0x3C\r\n [d102] Tx power: 2.6 dBm (1.8 mW)\r\n [d104] Rx power: -7.7 dBm (0.17 mW)\r\n SFP connector 1 is not present\r\n SFP connector 2 is not present\r\n SFP connector 3 is not present\r\n module IF1 (MIDDLE LEFT) of type 4*100/1000BASE-X(9094)\r\n SFP connector 0 data:\r\n [0] type of serial transceiver: 3 (SFP transceiver)\r\n [1] extended identifier of type of serial transceiver: 4\r\n [2] connector type: 7(LC)\r\n [3] infiniband compliance code: 0\r\n [4] sonet compliance code4: 0\r\n [5] sonet compliance code5: 0\r\n [6] gigabit ethernet compliance code: 2, 1000BASE-LX\r\n [11] serial encoding type: 1 8B10B\r\n [14] link length for 9/125mm fiber (km): 40\r\n [15] link length for 9/125mm fiber (100m): 0\r\n [16] link length for 50/125mm fiber (10m): 0\r\n [17] link length for 62.5/125mm fiber (10m): 0\r\n [18] link length for copper (m): 0\r\n [20] vendor name: HG GENUINE \r\n [37] vendor organizationally unique: 0\r\n [40] vendor part number: MXPD-243MD \r\n [56] vendor revision number: \r\n [60] Laser wavelength: 1310 nm\r\n [62] reserved field: 0\r\n [68] vendor serial number: ME12112000011 \r\n [84] vendor's date (yy-mm-dd): 12-03-17\r\n [90] vendor's date (vendor specific part): \r\n [224-255] vendor specific ID field : 0x00000000 \r\n 0x00000000 0x00000000 0x00000000 0x00000000 \r\n 0x00000000 0x00000000 0x00000000 \r\n [d102] Tx power: -3.0 dBm (0.50 mW)\r\n [d104] Rx power: -13 dBm (50 uW)\r\n SFP connector 1 is not present\r\n SFP connector 2 is Connection closed by foreign host.\r\r\n"
您认为这可能是期望脚本本身的问题，还是与 telnet 设备有关的其他问题？
如果您愿意，我们可以开一个screen 会议，我们可以一起解决这个问题，此时我对这个奇怪的问题感到绝望，不知道如何继续前进。
这是完整的预期输出：
$ telnet 10.220.64.67
Trying 10.220.64.67...
Connected to 10.220.64.67.
Escape character is '^]'.
******************************************************************
* *
* Tellabs 8609 Network Element *
* *
* Copyright (c) 2004-2015 Tellabs. All rights reserved. *
* *
******************************************************************
Enter configuration commands, one per line. End with ^Z
HENKEL_CAPITAL_2-EQU>enable
HENKEL_CAPITAL_2-EQU#show hw-inventory details
This is node 1643 of type 8609 and subrack address 0.
unit in slot 1 is part of inventory and UP AND RUNNING
unit 1 of width 1 has serial number 40601444713, CLEI code IPMVU00DRB
top level serial number 40601445792
manufacturing date 2016-3-30, 4:42:19.0, +0:00
part# 82.86S-8609-R6 rev C
HW type sbb2284-8609(2284) v3.0.1 SW type 0 v2.0.331
Pmax=70.0W, Ptyp=60.0W
infomodel FP2.0 (2.2.0); internal SW v.2.0.331
Supported infomodels:
FP2.0 (2.2.0)
CPLD active revision: 0x0130
WPIF expected and active revision: 0x001a
LMIF expected and active revision: 0x0023
TOCK expected and active revision: 0x0416
module IF0 (LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 52
[15] link length for 9/125mm fiber (100m): 255
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: FINISAR CORP.
[37] vendor organizationally unique: 36965
[40] vendor part number: FTLF1419P1BCL-TL
[56] vendor revision number: A
[60] Laser wavelength: 1310 nm
[62] reserved field: 0
[68] vendor serial number: PU117T5
[84] vendor's date (yy-mm-dd): 15-07-03
[90] vendor's date (vendor specific part):
[224-241] Tellabs part number: 81.86T-S001-13S-R6
[242-243] Tellabs revision: A
[244-253] Tellabs CLEI code: IPU3AVSKAA
[255] Tellabs checksum: 0x3C
[d102] Tx power: 2.6 dBm (1.8 mW)
[d104] Rx power: -7.7 dBm (0.17 mW)
SFP connector 1 is not present
SFP connector 2 is not present
SFP connector 3 is not present
module IF1 (MIDDLE LEFT) of type 4*100/1000BASE-X(9094)
SFP connector 0 data:
[0] type of serial transceiver: 3 (SFP transceiver)
[1] extended identifier of type of serial transceiver: 4
[2] connector type: 7(LC)
[3] infiniband compliance code: 0
[4] sonet compliance code4: 0
[5] sonet compliance code5: 0
[6] gigabit ethernet compliance code: 2, 1000BASE-LX
[11] serial encoding type: 1 8B10B
[14] link length for 9/125mm fiber (km): 40
[15] link length for 9/125mm fiber (100m): 0
[16] link length for 50/125mm fiber (10m): 0
[17] link length for 62.5/125mm fiber (10m): 0
[18] link length for copper (m): 0
[20] vendor name: HG GENUINE
[37] vendor organizationally unique: 0
[40] vendor part number: MXPD-243MD
[56] vendor revision number:
[60] Laser wavelength: 1310 nm
[62] reserved field: 0
[68] vendor serial number: ME12112000011
[84] vendor's date (yy-mm-dd): 12-03-17
[90] vendor's date (vendor specific part):
[224-255] vendor specific ID field : 0x00000000
0x00000000 0x00000000 0x00000000 0x00000000
0x00000000 0x00000000 0x00000000
[d102] Tx power: -3.0 dBm (0.50 mW)
[d104] Rx power: -13 dBm (50 uW)
SFP connector 1 is not present
SFP connector 2 is not present
SFP connector 3 is not present
module IF2 (MIDDLE) of type 4*10/100/1000BASE-T(9093)
module IF3 (RIGHT MIDDLE) of type 8*10/100BASE-TX-LM(2243) v2.0.1 (hot insert)
serial number 40601373354, CLEI code IPU3A7TKAA
top level serial number 40601376329
manufacturing date 2015-10-20, 8:51:59.0, +0:00
part# 81.86LFETX82243-R6 rev D
Pmax=4.60W, Ptyp=4.00W
module IF4 (RIGHT) of type 8*10/100BASE-TX-LM(2243) v2.0.1 (hot insert)
serial number 40601405399, CLEI code IPU3A7TKAA
top level serial number 40601405948
manufacturing date 2015-12-31, 0:06:43.0, +0:00
part# 81.86LFETX82243-R6 rev D
Pmax=4.60W, Ptyp=4.00W
module COOLING FAN 1 of type fmb2285-coolingFan(2285)
module PRIMARY POWER of type -48Vdc(2264)(2264) v2.0.0
serial number 40601425507, CLEI code IPUPAKMLAA
top level serial number 40601430234
manufacturing date 2016-2-26, 17:02:48.9, +8:00
part# 81.86P-0911DC48-R6 rev C
Pmax=0.00W, Ptyp=0.00W
module OVEN CONTROLLED OSCILLATOR of type vid9096-ocxo(9096) v1.0.0
interface module 0 has
expected type 4*100/1000BASE-X
active type 4*100/1000BASE-X
existing type 4*100/1000BASE-X
mode is not relevant
interface module 1 has
expected type 4*100/1000BASE-X
active type 4*100/1000BASE-X
existing type 4*100/1000BASE-X
mode is not relevant
interface module 2 has
expected type 4*10/100/1000BASE-T
active type 4*10/100/1000BASE-T
existing type 4*10/100/1000BASE-T
mode is not relevant
interface module 3 has
expected type 8*10/100BASE-TX-LM
active type 8*10/100BASE-TX-LM
existing type 8*10/100BASE-TX-LM
mode is not relevant
Pmax=4.60W, Ptyp=4.00W
interface module 4 has
expected type 8*10/100BASE-TX-LM
active type 8*10/100BASE-TX-LM
existing type 8*10/100BASE-TX-LM
mode is not relevant
Pmax=4.60W, Ptyp=4.00W
power module primary has
expected type -48Vdc(2264)
active type -48Vdc(2264)
existing type -48Vdc(2264)
mode is not relevant
Pmax=0.00W, Ptyp=0.00W
oven controlled oscillator has
expected type vid9096-ocxo
active type vid9096-ocxo
existing type vid9096-ocxo
mode is not relevant
HENKEL_CAPITAL_2-EQU#exit
Connection closed by foreign host.
在前面的输出中，我手动输入了命令，它工作正常，唯一的区别是我没有使用 terminal more off 和 terminal length 200 命令。
$ telnet 10.220.64.67
Enter configuration commands, one per line. End with ^Z
HENKEL_CAPITAL_2-EQU>enable
HENKEL_CAPITAL_2-EQU#show hw-inventory details
**[short output... due to the limit of the *** text box]**
--More--
mode is not relevant
HENKEL_CAPITAL_2-EQU#exit
Connection closed by foreign host.
当我看到 --More-- 字符串时，我只需键入空格键以获得更多输出，直到显示最后一个提示 HENKEL_CAPITAL_2-EQU#，然后我只需输入 exit 命令。
【问题讨论】：
看看sexpect (Expect for Shells)，您可以使用它来编写仅使用shell代码的Expect脚本。 我已经重新格式化了我的代码并使其更易于阅读，以专注于我正在使用没有身份验证的设备的问题，因此我们可以专注于关闭连接的原因 连接关闭由外国主持人。并确认我们是否可以做些什么。 【参考方案1】：问题出在这里：
send "show hw-inventory details\r"
expect $prompt
send "exit\r"
你set prompt "#" 这很危险。 show hw-inventory details 的输出确实有字符 #（参见行 part# 82.86S-8609-R6 rev C）所以 expect $prompt 会成功，然后是 send "exit\r" ，所以连接被关闭。
解决方法：提示使用更准确的字符串，例如：
# '[' needs to be backslash escaped or it'll trigger Tcl's command substitution
set prompt "HENKEL_CAPITAL_2-EQU\[>#]"
【讨论】：
这很好，在我编辑提示后它工作了，现在的问题是如何将它设置为动态的，因为主机名从设备更改为设备。我想我总能在第一个 > 巧合时得到设备名称。 ``` HENKEL_CAPITAL_2-EQU>enable ``` 这是我目前的提示。 ``` grep '设置提示符' runCommands.exp 设置提示符“HENKEL_CAPITAL_2-EQU#” ```【参考方案2】：您的主要问题似乎是您在不同级别交错代码（尤其是那些sleep 1s！），导致脚本实际上是纯乱码。代码没有崩溃纯属偶然。
重写有问题的部分，同时猜测你需要什么......
# Handle login
expect
"user name:"
send "$user\r"
exp_continue; # keep waiting
"password:"
send "$password\r"
exp_continue; # keep waiting
">"
# Got a logged-in prompt so stop waiting (by not exp_continuing)
# Handle what's going on remotely; note that we've a prompt at this point
# and can use simple challenge/response coding from here on
set prompt "# "
send "enable\r"
expect $prompt
send "terminal length 200\r"
expect $prompt
send "terminal more off\r"
foreach cmd $commands
expect $prompt
send "$cmd\r"
expect $prompt
send "exit\r"
expect eof
一旦你添加了错误处理而不是相信一切都能正常工作，这种技术就会变得更有价值，因为 expect 的主要力量之一是能够同时等待几件事情。你不需要'通常不需要它，但是当你这样做时它非常有价值！
您通常不需要添加 sleep 调用，而不是当您只是发送命令并等待提示返回时。
【讨论】：
嘿@Donal Fellows 我已经听从了你的建议，但我仍然遇到同样的错误，还有什么我应该尝试的吗？以上是关于Linux 期望脚本有时以“连接被外国主机关闭”结尾，这是期望脚本还是设备问题？的主要内容，如果未能解决你的问题，请参考以下文章
通过像 Unix/Linux 中的期望脚本一样通过 c++ 提供登录名和密码