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Had previously been using a "shell + expect" combination。

Later in the course of，Expect more and more that this stuff is too far behind，The following reasons：

1. It has stopped issuing new official version；

2. Debug inefficient，In many cases the code to go with the way people think Mom。

then，It was later decided to use a scripting language python all done。

Practice has proved that，python development efficiency is very high，Indeed "rough fast fierce"。

stop，Digress。。。

In my Automation case in，You need to check whether a command is executed successfully (assuming command checklog，Successful return 0，Failure to return 1)。

Under normal circumstances，In the next sentence checklog，Direct "echo $?”,Judgment 0，1To。

but，Because the execution environment of the command prompt, 0 and 1，So pexpect not judge "echo $?"the result of。

later，Wondering wondering，My mind just emerge above knowledge points，I tried it，Fix the problem it is hereby Mark。

# Checklog expect the successful implementation
checklog && echo success
pexpect.expect(‘success’)

# Checklog execution failed expectations
checklog || echo failure
pexpect.expect(‘failure’)

Brush up the knowledge：
1. Command is the semicolon ";"Separated，These commands will be executed sequentially down；
2. Command is "&&"Separated，These commands will be executed sequentially down，Stop command execution encountered an error；
3. Commands are double pipe "||"Separated，These commands will be executed sequentially down，Stop command is successful encounter，All commands will not be executed later;

This relates to semaphores on your system (you’ve run out). Run the following to clear them out:

ipcs | grep apache | awk ‘{print $2}’ > sem.txt
for i in `cat sem.txt`; do { ipcrm -s $i; }; done;

If this becomes a common occurance, then you may need to change your ipcs semaphore limits.
Set the following in your /etc/sysctl.conf:

kernel.msgmni = 1024
kernel.sem = 250 256000 32 1024

and reboot your system to load in those values.

1.In the parent machine lxc-attach -n 101

2.passwd

3.exit