如何将文件内容转换为大写或小写？
要将文件的内容转换为大写，需要使用ToUpper()方法，而要转换为小写，则需要使用ToLower()方法。
大写示例
(Get-Content D:\Temp\PowerShellaliases.txt).ToUpper()
输出结果
PS C:\WINDOWS\system32> (Get-Content D:\Temp\PowerShellaliases.txt).ToUpper()COMMANDTYPE NAME VERSION SOURCE
----------- ---- ------- ------
ALIAS % -> FOREACH-OBJECT
ALIAS ? -> WHERE-OBJECT
ALIAS AC -> ADD-CONTENT
ALIAS ASNP -> ADD-PSSNAPIN
ALIAS CAT -> GET-CONTENT
ALIAS CD -> SET-LOCATION
ALIAS CFS -> CONVERTFROM-STRING 3.1.0.0 MICROSOFT.POWERSHELL.UTILITY
ALIAS CHDIR -> SET-LOCATION
ALIAS CLC -> CLEAR-CONTENT
ALIAS CLEAR -> CLEAR-HOST
ALIAS CLHY -> CLEAR-HISTORY
ALIAS CLI -> CLEAR-ITEM
ALIAS CLP -> CLEAR-ITEMPROPERTY
ALIAS CLS -> CLEAR-HOST
小写的例子
(Get-Content D:\Temp\PowerShellaliases.txt).ToLower()
输出结果
PS C:\WINDOWS\system32> (Get-Content D:\Temp\PowerShellaliases.txt).ToLower()commandtype name version
----------- ---- -------
alias % -> foreach-object
alias ? -> where-object
alias ac -> add-content
alias asnp -> add-pssnapin
alias cat -> get-content
alias cd -> set-location
alias cfs -> convertfrom-string 3.1.0.0
alias chdir -> set-location
alias clc -> clear-content
alias clear -> clear-host
alias clhy -> clear-history
alias cli -> clear-item
alias clp -> clear-itemproperty
alias cls -> clear-host
alias clv -> clear-variable
alias cnsn -> connect-pssession
alias compare -> compare-object
alias copy -> copy-item
alias cp -> copy-item
alias cpi -> copy-item
alias cpp -> copy-itemproperty
alias curl -> invoke-webrequest
alias cvpa -> convert-path
alias dbp -> disable-psbreakpoint
alias del -> remove-item
alias diff -> compare-object
alias dir -> get-childitem
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