In [2]:

    

# is null or empty
[string]::IsNullOrEmpty("")
[string]::IsNullOrEmpty($null)


    

    




# is null or empty
[string]::IsNullOrEmpty("")
True
[string]::IsNullOrEmpty($null)
True

In [4]:

    

# "${base%/}/${rel}"
Write-Output (Join-Path "~/" ".zshrc")


    

    




~/.zshrc

In [25]:

    

# dirname (readlink -f /Users/pogin/.bashrc)
Write-Output (Split-Path -Parent "/Users/pogin/.bashrc")


    

    




# dirname (readlink -f /Users/pogin/.bashrc)
Write-Output (Split-Path -Parent "/Users/pogin/.bashrc")
/Users/pogin

In [2]:

    

$x = 0
while ($x -lt 5) {
    $x += 1
    Write-Output $x
}


    

    




$x = 0
while ($x -lt 5) {
>>     $x += 1
>>     Write-Output $x
>> }
>> 
1
2
3
4
5

In [3]:

    

$items = 1..10
foreach ($item in $items) {
    write-output $item
}


    

    




$items = 1..10
foreach ($item in $items) {
>>     write-output $item
>> }
>> 
1
2
3
4
5
6
7
8
9
10

In [5]:

    

# switch
$i = 3
switch ($i) {
    1 {Write-Output "1"; break}
    2 {Write-Output "2"; break}
    {$_ -lt 5} {Write-Output "5より小さい"; break}
    default {Write-Output "default句"; break}
}


    

    




5より小さい

In [7]:

    

$num1 = 1
$num2 = 2
$num1 -eq $num2 # == $num1は$num2と等しい
$num1 -ne $num2 # != $num1は$num2は等しくない
$num1 -lt $num2 # <  $num1は$num2より小さい
$num1 -gt $num2 # >  $num1は$num2より大きい
$num1 -le $num2 # <= $num1は$num2以下
$num1 -ge $num2 # >= $num1は$num2以上


    

    




5より小さい
$num1 = 1
$num2 = 2
$num1 -eq $num2 # == $num1は$num2と等しい
False
$num1 -ne $num2 # != $num1は$num2は等しくない
True
$num1 -lt $num2 # <  $num1は$num2より小さい
True
$num1 -gt $num2 # >  $num1は$num2より大きい
False
$num1 -le $num2 # <= $num1は$num2以下
True

In [ ]: