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Adding in escape chars and more info on call operator with exe's

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escape chars like newlines, tabs, negating affects
call operator and dot-sourcing for paths to exes with spaces in them and arguments passed.
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Andrew Ryan Davis 2020-08-20 00:10:08 -07:00
parent c0a8574825
commit fc9b23f357
1 changed files with 27 additions and 1 deletions
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28
powershell.html.markdown
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@ -677,6 +677,19 @@ $PSVersionTable
```Powershell ```Powershell
# Calling external commands, executables, and functions with the call operator. # Calling external commands, executables, and functions with the call operator.
# Executables with arguments passed create issues
C:\Program Files\dotnet\dotnet.exe
The term 'C:\Program' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again
"C:\Program Files\dotnet\dotnet.exe"
C:\Program Files\dotnet\dotnet.exe # returns the string rather than execute it
&"C:\Program Files\dotnet\dotnet.exe --help" # fail
&"C:\Program Files\dotnet\dotnet.exe" --help # success
# Alternatively, you can use dot-sourcing here
."C:\Program Files\dotnet\dotnet.exe" --help # success
# the call operator (&) is similar to Invoke-Expression, but IEX runs in current scope. # the call operator (&) is similar to Invoke-Expression, but IEX runs in current scope.
# Standard usage of '&' would be to invoke a scriptblock inside of your script. # Standard usage of '&' would be to invoke a scriptblock inside of your script.
# Notice the variables are scoped # Notice the variables are scoped
@ -693,7 +706,20 @@ $i # => 5
$x=1 $x=1
&{$x=2};$x # => 1 &{$x=2};$x # => 1
. {$x=2};$x # => 2 .{$x=2};$x # => 2
# Escape Characters in Powershell
# Many languages use the '\', but Windows uses this character for
# file paths. Powershell thus uses '`' to escape characters
# Take caution when working with files, as '`' is a
# valid character in NTFS filenames.
"Showing`nEscape Chars" # => new line between Showing and Escape
"Making`tTables`tWith`tTabs" # +> Format things with tabs
# Negate pound sign to prevent comment
# Note that the function of '#' is removed, but '#" is still present
`#Get-Process # => Fail: not a recognized cmdlet
# Remoting into computers is easy # Remoting into computers is easy