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Linux PDF

 This is the pdf that you will ever need to master Linux.



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Linux basic commands

 Linux basic commands: du  -sh  *  |  sort  -h  -r   |  head  -n  40  :    list out first 40 files in the directory that are taking more space in the directory.  cd : change directory Is-l listing the items in long listing format  pwd : print working directory Is-I format: type :no of links:owner : group:size :month :day :time :name cd/: go to/directory whoami: tells us by which username we are logged in. touch jerry: creates the file named jerry in present working directory. cp jerry lex: copy the content of jerry file and paste it to lex file. vi text1: creates the file text1 and open it in vi editor mkdir superman: creates the directory called superman mkdir abc def  : creates 2 folder in one command. touch filename wont work in /etc/ folder if logged in by normal account. man cp: shows manual for cp command. echo "india is my country"> file1 puts the text in file1. rm filename: remove the filename  mv lex luther renames the file from lex to luther  mv luther /h
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patching tasks

 Patching a Linux system is a critical task to ensure that the system remains secure, stable, and up-to-date with the latest features and fixes. Here’s a comprehensive guide to the tasks involved in Linux patching: 1. Pre-Patching Preparation Backup System : Ensure you have a full system backup, including critical data, configuration files, and applications. Test the backup to verify its integrity. Check Disk Space : Verify that you have enough disk space, particularly on /var , /tmp , and /boot partitions. Review Current Patch Level : Determine the current patch level and installed packages using package management tools like yum , apt , dpkg , or rpm . Check System Logs : Review system logs to identify any issues that might affect the patching process. Test in a Staging Environment : If possible, apply patches in a staging environment that mirrors production to identify potential issues. Notify Stakeholders : Inform stakeholders about the scheduled maintenance window and expected do
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