Powershell replace double quotes with single in a string

Question

I just can't get it right

The below statement throws an exception and I cannot get the correct format

$appendedQry = $appendedQry -replace "\"","'"

What would be the correct syntax?

Answer 1

它应该是

$appendedQry = $appendedQry -replace '"',''''

Answer 2

this because the escaping character is `

in the following a working example

$appendedQry = "`"asd"
echo $appendedQry
$appendedQry = $appendedQry -replace "`"", "'"
echo $appendedQry

Answer 3

I was replacing all occurances of the string in a file, using command

powershell -Command "(gc c:\input.txt) -replace 'aaa', 'bbb' | Out-File c:\output.txt"

To replace double quotes I need to do some trick - use the variable:

$ToReplace = "\" + """"
$command = "(gc c:\input.txt) -replace '" + $ToReplace + "', 'bbb' | Out-File c:\output.txt"
powershell -Command $command