用于快速查看虚拟机管理程序(KVM)的Bash脚本

Question

我正在寻找一种方法，以便在查找来宾虚拟机(运行KVM(时快速查看系统管理程序。

我有一个脚本，它将我的所有管理程序(与来宾虚拟机(收集在一个用换行符分隔的文本文件中(见下面的示例(：

Hypervisor: hypervisor1
ID    Name                           State
----------------------------------------------------
1     vm1                            running
2     vm2                            running
3     vm3                            running
4     vm4                            running
Hypervisor: hypervisor2
ID    Name                           State
----------------------------------------------------
1     vm1                            running
2     vm2                            running
3     vm3                            running
4     vm4                            running
5     vm5                            running
6     vm6                            running
ETC....

我尝试过：

grep -v -E "(-|Name)" file.txt |
awk -F ' ' '{print $2}' |
tr "n" " " |
sed "s/ * / -> /"

但我明白了：

hypervisor1 -> vm1 vm2 vm3 vm4  hypervisor2 vm1 vm2 vm3 vm4 vm5 vm6

我的问题是：如何显示？

hypervisor1 -> vm1 vm2 vm3 vm4
hypervisor2 -> vm1 vm2 vm3 vm4 vm5 vm6
etc.. etc...

Answer 1

带awk:

awk '/Hypervisor:/ {printf "%s ->", $2} # row contains Hypervisor:
$0==""        {print ""}           # row is empty
$1~/[0-9]/    {printf " %s", $2}   # first column contains digit
END           {print ""}' file     # add a trailing newline

输出：

hypervisor1->vm1-vm2-vm3-vm4hypervisor2->vm1 vm2 vm3 vm4 vm5 vm6

Answer 2

对于您显示的示例，您可以尝试以下操作吗。

awk '
/Hypervisor:/{
if(value1){
print value,value1
}
found=value1=""
value=$NF
next
}
/ID/{
found=1
next
}
found && match($0,/vm[0-9]+/){
value1=(value1?value1 OFS:"")substr($0,RSTART,RLENGTH)
}
END{
if(value1){
print value,value1
}
}
'  Input_file

解释：添加以上详细解释。

awk '                             ##Starting awk program from here.
/Hypervisor:/{                    ##Checking condition if line contains Hypervisor: then do following.
if(value1){                     ##Checking if value1 is NOT NULL.
print value,value1            ##Printing value and value1 here.
}
found=value1=""                 ##Nullify found and value1 here.
value=$NF                       ##Setting value as last field here.
next                            ##next will skip all further statements from here.
}
/ID/{                             ##Checking condition if ID is found in current line then do following.
found=1                         ##Setting found to 1 here.
next                            ##next will skip all further statements from here.
}
found && match($0,/vm[0-9]+/){    ##Checking if found is SET and match function to match vm values.
value1=(value1?value1 OFS:"")substr($0,RSTART,RLENGTH)
##Creating value1 which has matched sub string and keep adding its values to it.
}
END{                              ##Starting END block of this program from here.
if(value1){                     ##Checking condition if value1 is set then do following.
print value,value1            ##Printing value and value1 here.
}
}
'  Input_file                     ##Mentioning Input_file name here.

Answer 3

这可能对你有用(GNU sed(：

sed -E '/Hypervisor:/{s/.*: //;:a;x;/./{s/n/ -> /;s// /g;p};x;h;d}
/^s*[0-9]+s*(S+).*/{s//1/;H};$!d;ba' file

将相关详细信息存储在保留空间中，并在管理程序更改或文件结束时，将存储的值操作为所需的格式。