Java tutorial for beginners
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Java tutorial for beginners
5M ago
1. Overview
Searching for strings in text files is a common task in bash, used in scenarios like log file analysis and configuration file searches. This article explores various methods to check if file contains String, including both case-sensitive and case-insensitive approaches.
2. Introduction to Problem Statement
Let’s consider a log file named server.log:
2023-11-24 10:00:00 INFO Starting server process
2023-11-24 10:00:05 ERROR Failed to bind to port 8080
2023-11-24 10:00:10 INFO Server listening on port 9090
2023-11-24 10:01:00 WARN Database connection timeout
Our goal is to check if ..read more
Java tutorial for beginners
8M ago
Using Get-ADDefaultDomainPasswordPolicy Cmdlet
The Get-ADDefaultDomainPasswordPolicy is used to get the default password policy for the specified domain. We can use it differently in different use cases; let’s learn a few of them below.
Use the Get-ADDefaultDomainPasswordPolicy cmdlet with the -Current parameter to get the default password policy for the currently logged-on user in an active directory. Here, the user can be an Administrator or any XYZ name.
Get-ADDefualtDomainPasswordPolicy -Current LoggedOnUser
ComplexityEnabled : True
DistuniguishedName : DC=maslab,DC=c ..read more
Java tutorial for beginners
8M ago
Using netsh Command
netsh winhttp show proxy
Current WinHTTP proxy settings:
Proxy Server(s) : 10.0.0.21:8080
Bypass List : (none)
On Windows machines, the above command is useful for checking the current proxy settings and it is beneficial for verifying proxy settings and troubleshooting network connectivity.
We used this command to check the current proxy settings on Windows. Here, the netsh (Network Shell) is the command-line tool in Windows, utilized to communicate with different network-related settings.
The winhttp specified the context for the netsh, which indicated that ..read more
Java tutorial for beginners
8M ago
We can have multiple use cases for getting memory usage percentages. For example:
Getting overall memory usage percentage
Getting overall memory usage percentage history
Getting memory usage percentage for one/all processes
Let’s learn them one by one.
Overcall Memory Usage Percentage
We can use Get-Counter and Get-WmiObject cmdlets to retrieve the overall memory usage percentage. Let’s explore them below in detail.
Use Get-Counter Cmdlet
Use the Get-Counter cmdlet to get total memory usage in percentage.
$performance_counter = Get-Counter '\Memory\% Committed Bytes In Use'
$usedMemoryPer ..read more
Java tutorial for beginners
8M ago
Using Environment Variable
Use an environment variable to get a fully qualified domain name.
$computer_name = $env:COMPUTERNAME
$fqdn = $env:USERDNSDOMAIN
Write-Output "Fully Qualified Domain Name: $computer_name.$fqdn"
Fully Qualified Domain Name: MAS-DC-01.MASLAB.COM
First, we assigned the value of the environment variable ($evn:COMPUTERNAME) to the $computer_name variable. The environment variable COMPUTERNAME stored the current computer’s name or you can say the current host’s name; both meaning the same.
Then, we assigned the $fqdn variable with the value of the $env:USERDNSDOMAIN env ..read more
Java tutorial for beginners
8M ago
Using ConvertFrom-Json Cmdlet
We can use the ConvertFrom-Json cmdlet to traverse the JSON file with first and nested-level keys; Let’s explore them below.
Traverse JSON File Containing First-Level Keys
Use ConvertFrom-Json with the foreach loop to traverse the JSON file having first-level keys only.
{
"name": "John Christoper",
"age": 40,
"city": "Washington"
}
$jsonData = Get-Content -Path "./file.json" -Raw | ConvertFrom-Json
foreach ($current_property in $jsonData.PSObject.Properties) {
Write-Host "$($current_property.Name): $($current_property.Value)"
}
name: John Chri ..read more
Java tutorial for beginners
8M ago
Using Get-History Cmdlet
Using Get-History to get the complete history of the executed commands in PowerShell.
Get-History
Id CommandLine
-- -----------
1 Get-History
2 ls
3 ping example.com
4 Get-History
5 Get-History
6 Get-Process
7 Get-Service
In this example, the history of the commands is obtained using the Get-History cmdlet. On execution of the above code, we can see the list of executed commands is returned and displayed on the screen with their respective Id (showing the sequence of the execution of the commands) and the CommandLine (showing the text or comm ..read more
Java tutorial for beginners
8M ago
Using grep Command
Use grep with the -q option to check if output contains String in Bash.
#!/bin/bash
output=$(ls -l)
search_string=".csv" # String to search for in the output
if echo "$output" | grep -q "$search_string"; then
echo "The output contains the search string."
else
echo "The output does not contain the search string."
fi
The output contains the search string.
In this example, the ls command is used to get the list of directories and files in the current working directory. Here, the -1 parameter is used with the ls command to get detailed information about the list and ..read more
Java tutorial for beginners
9M ago
Using Get-ADUser Cmdlet
Use the Get-ADUser cmdlet to get the password expiration date for one specific user in an Active Directory.
Get-ADUser -Identity Administrator
–Properties "SamAccountName", "msDS-UserPasswordExpiryTimeComputed" |
Select-Object -Property "SamAccountName",
@{Name="PasswordExpiryDate";Expression={[DateTime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed")}}
SamAccountName PasswordExpiryDate
-------------- ------------------
Administrator 8/27/2023 4:35:46 PM
The Get-ADUser cmdlet is used to get one or multiple users from an active directory. We ..read more
Java tutorial for beginners
9M ago
Using Get-ADUser Cmdlet
We use Get-ADUser differently based on various use cases; let’s explore a few of them below.
Get Home Directory & Drive for One User
Use the Get-ADUser cmdlet to get the ad user’s home directory and home drive.
$username = 'Administrator'
Get-ADUser -Identity $username -Properties * |
Select HomeDirectory, HomeDrive
HomeDirectory HomeDrive
------------- ---------
\\mas-dc-01\Users\Administrator\Documents D:
First, we initialized the $username variable with the Administrator; this was the use ..read more