Operating Systems & Environments

# Get all yum commands previously run

yum history list all

# Get the details of the command

yum history info [entry number]

# Undo each command top-down

yum history undo [entry number]

Install Apache:

•      First, clean-up yum:

sudo yum clean all

• As a matter of best practice we’ll update our packages:

sudo yum -y update

• Installing Apache is as simple as running just one command:

sudo yum -y install httpd

Allow Apache Through the Firewall

This tutorial shows you how to disable or enable  the File Compression feature in Microsoft Windows.

1- Disable the File Compression feature .

• Select the "Start" button, then type "CMD".
• Right-click "Command Prompt", then choose "Run as administrator" (If prompted for a password, enter credentials for an account that has administrator rights.)
• Type the following then press "Enter".
  fsutil behavior set disablecompression 1

2- Enable the File Compression feature .

Folder names are incorrect or displayed in an incorrect language in Outlook

Open CMD (Command Prompt) on windows

change the path to this directory

C:\Program Files (x86)\Microsoft Office\root\Office16, by writing 

cd C:\Program Files (x86)\Microsoft Office\root\Office16

write this command

Outlook.exe /ResetFolderNames

How to view the Crontab list of jobs

crontab -l

crontab -u username -l

Example with user testuser:

crontab -u testuser -l

First view all the daily cron jobs:

in this wiki we have  Backing up and restoring  Database from local server and external server,

Backup Database

Backup from local server

mysqldump -u{username} -p{passoword} {database} | gzip > {path}/backup_filename_$(date +%F).sql.gz

Backup from external server

mysqldump -P {port} -h {host} -u{username} -p{passoword} {database} | gzip > {path}/backup_file_name_$(date +%F).sql.gz

Backup specific tables

mysqldump -u{username} -p{passoword} {database} table1 table2 > {path}/table1_table2.sql

To compress one file or folder to a tar file:

tar -cvf xxx.tar file

To extract a tar file:

tar -xvf file.tar

To compress one file or folder to a tar.gz file:

tar -cvzf xxx.tar.gz file

To extract a tar.gz file:

tar -xvzf file.tar.gz

To compress one file or folder to a tar.bz2 file:

tar -cvjf xxx.tar.bz2 file

To extract a tar.bz2 file:

tar -xvjf file.tar.bz2

To