| Server IP : 134.29.175.74 / Your IP : 216.73.216.160 Web Server : nginx/1.10.2 System : Windows NT CST-WEBSERVER 10.0 build 19045 (Windows 10) i586 User : Administrator ( 0) PHP Version : 7.1.0 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : OFF | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : C:/Windows/System32/WindowsPowerShell/v1.0/en-US/ |
Upload File : |
ABOUT QUOTING RULES
SHORT DESCRIPTION
Describes rules for using single and double quotation marks in PowerShell.
LONG DESCRIPTION
Quotation marks are used to specify a literal string. You can enclose a
string in single quotation marks (') or double quotation marks (").
Quotation marks are also used to create a here-string. A here-string is a
single-quoted or double-quoted string in which quotation marks are
interpreted literally. A here-string can span multiple lines. All the lines
in a here-string are interpreted as strings, even though they are not
enclosed in quotation marks.
In commands to remote computers, quotation marks define the parts of the
command that are run on the remote computer. In a remote session, quotation
marks also determine whether the variables in a command are interpreted
first on the local computer or on the remote computer.
SINGLE AND DOUBLE-QUOTED STRINGS
When you enclose a string in double quotation marks (a double-quoted
string), variable names that are preceded by a dollar sign ($) are replaced
with the variable's value before the string is passed to the command for
processing.
For example:
$i = 5
"The value of $i is $i."
The output of this command is:
The value of 5 is 5.
Also, in a double-quoted string, expressions are evaluated, and the result
is inserted in the string. For example:
"The value of $(2+3) is 5."
The output of this command is:
The value of 5 is 5.
When you enclose a string in single-quotation marks (a single-quoted
string), the string is passed to the command exactly as you type it. No
substitution is performed. For example:
$i = 5
'The value of $i is $i.'
The output of this command is:
The value $i is $i.
Similarly, expressions in single-quoted strings are not evaluated. They are
interpreted as literals. For example:
'The value of $(2+3) is 5.'
The output of this command is:
The value of $(2+3) is 5.
To prevent the substitution of a variable value in a double-quoted string,
use the backtick character (`)(ASCII 96), which is the Windows PowerShell
escape character.
In the following example, the backtick character that precedes the first $i
variable prevents Windows PowerShell from replacing the variable name with
its value. For example:
$i = 5
"The value of `$i is $i."
The output of this command is:
The value $i is 5.
To make double-quotation marks appear in a string, enclose the entire
string in single quotation marks. For example:
'As they say, "live and learn."'
The output of this command is:
As they say, "live and learn."
You can also enclose a single-quoted string in a double-quoted string. For
example:
"As they say, 'live and learn.'"
The output of this command is:
As they say, 'live and learn.'
Or, double the quotation marks around a double-quoted phrase. For example:
"As they say, ""live and learn."""
The output of this command is:
As they say, "live and learn."
To include a single quotation mark in a single-quoted string, use a second
consecutive single quote. For example:
'don''t'
The output of this command is:
don't
To force Windows PowerShell to interpret a double quotation mark literally,
use a backtick character. This prevents Windows PowerShell from
interpreting the quotation mark as a string delimiter. For example:
"Use a quotation mark (`") to begin a string."
Because the contents of single-quoted strings are interpreted literally,
you cannot use the backtick character to force a literal character
interpretation in a single-quoted string.
For example, the following command generates an error because Windows
PowerShell does not recognize the escape character. Instead, it interprets
the second quotation mark as the end of the string.
PS C:\> 'Use a quotation mark (`') to begin a string.'
Unexpected token ')' in expression or statement.
At line:1 char:27
+ 'Use a quotation mark (`') <<<< to begin a string.'
HERE-STRINGS
The quotation rules for here-strings are slightly different.
A here-string is a single-quoted or double-quoted string in which quotation
marks are interpreted literally. A here-string can span multiple lines. All
the lines in a here-string are interpreted as strings even though they are
not enclosed in quotation marks.
Like regular strings, variables are replaced by their values in
double-quoted here-strings. In single-quoted here-strings, variables are
not replaced by their values.
You can use here-strings for any text, but they are particularly useful for
the following kinds of text:
- Text that contains literal quotation marks
- Multiple lines of text, such as the text in an HTML or XML
- The Help text for a script or function document
A here-string can have either of the following formats, where <Enter>
represents the linefeed or newline hidden character that is added when you
press the ENTER key.
Double-quotes:
@"<Enter>
<string> [string] ...<Enter>
"@
Single-quotes:
@'<Enter>
<string> [string] ...<Enter>
'@
In either format, the closing quotation mark must be the first character in
the line.
A here-string contains all the text between the two hidden characters. In
the here-string, all quotation marks are interpreted literally. For
example:
@"
For help, type "get-help"
"@
The output of this command is:
For help, type "get-help"
Using a here-string can simplify using a string in a command. For example:
@"
Use a quotation mark (') to begin a string.
"@
The output of this command is:
Use a quotation mark (') to begin a string.
In single-quoted here-strings, variables are interpreted literally and
reproduced exactly. For example:
@'
The $profile variable contains the path
of your Windows PowerShell profile.
'@
The output of this command is:
The $profile variable contains the path
of your Windows PowerShell profile.
In double-quoted here-strings, variables are replaced by their values. For
example:
@"
Even if you have not created a profile,
the path of the profile file is:
$profile.
"@
The output of this command is:
Even if you have not created a profile,
the path of the profile file is:
C:\Users\User1\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1.
Here-strings are typically used to assign multiple lines to a variable. For
example, the following here-string assigns a page of XML to the $page
variable.
$page = [XML] @"
<command:command xmlns:maml="http://schemas.microsoft.com/maml/2004/10"
xmlns:command="http://schemas.microsoft.com/maml/dev/command/2004/10"
xmlns:dev="http://schemas.microsoft.com/maml/dev/2004/10">
<command:details>
<command:name>
Format-Table
</command:name>
<maml:description>
<maml:para>Formats the output as a table.</maml:para>
</maml:description>
<command:verb>format</command:verb>
<command:noun>table</command:noun>
<dev:version></dev:version>
</command:details>
...
</command:command>
"@
Here-strings are also a convenient format for input to the
ConvertFrom-StringData cmdlet, which converts here-strings to hash tables.
For more information, see ConvertFrom-StringData.
SEE ALSO
about_Special_Characters
ConvertFrom-StringData