Powershell小技巧之复合筛选

当你分析文本日志或筛选不通类型的信息时，你通常要使用 where-object。这里有一个通用脚本来说明复合筛选：

# logical and filter for all keywords 
get-content -path c:\windows\windowsupdate.log | 
 where-object { $_ -like '*successfully installed*' } | 
 where-object { $_ -like '*framework*' } | 
 out-gridview
 
# above example can also be written in one line 
# by using the -and operator 
# the resulting code is not faster, though, just harder to read 
get-content -path c:\windows\windowsupdate.log | 
 where-object { ($_ -like '*successfully installed*') -and ($_ -like '*framework*') } | 
 out-gridview
 
# logical -or (either condition is met) can only be applied in one line 
get-content -path c:\windows\windowsupdate.log | 
 where-object { ($_ -like '*successfully installed*') -or ($_ -like '*framework*') } | 
 out-gridview