Linux Tips & Notes for SysAdmin & DevOps
Introduction
Linux Command Line
File System Hierarchy
Linux Tips & Tricks
- create a Linux Kernel Module
- Clear & Drop Memory Cache
- Linux Firewalld UFW Usage
- Enable IP forwarding
- Linux Kernel Boot Parameters
- Apparmor conflicted with ntpd apparmor=DENIED operation=capable
- Delete file argument list too long
- awk usage example
- run a process in background
- Get TCP status with proc
- Change hostname for Linux
- Change Timezone for Linux
- Lock important file with chattr
- md5, sha1, sha256, sha512 checksum
- Clean up penetration trace
- Hotkey with Ctrl
- Cronjob concurrency with flock
- delete specific files EXCEPT certain pattern
- File & Dir permission
- Get disk block size in Linux
- Get hardware temperature in Linux
- dstat usage
- ELF explanation
- Empty large file
- find usage
- nf_conntrack table full, dropping packet
- Enable & Disable ping
- Generate random hexadecimal
- Read hex file
- Monitor Linux Network Bandwidth
- Linux kernel development
- Get all open files with given PID
- Change max open files limit
- UDP based SSH client
- File transfer with nc
- Get disk space with ncdu
- Kernel Warning: neighbour table overflow
- netstat usage
- Linux System Performance Tools
- POSIX character set
- Linux process states
- Purge file system cache in Linux
- Specify SSH port in rsync
- scp usage examples
- sed usage examples
- SetUID SetGID & Sticky bit
- TCP/UDP port forwarding with socat
- socat usage examples
- Add Files to Linux Path
- ssh warning: POSSIBLE BREAK-IN ATTEMPT
- Change syslog max message length
- Compress gz/bz2/xz with tar
- Tmux Cheatsheet
- Resolve: Too many TCP connections
- Trigger kernel panic to get coredump
- Ignore case sensitive in ls
- NTP Service Summary
- rsync usage examples
- Subscribe Linux Kernel Mail List
- Add Env PATH in supervisor
- Cgroups
- Systemd
- Linux AppArmor
- Why should disable THP
More Articles
How To Tune Your Linux Enterprise Server Performance
https://www.suse.com/c/how-to-tune-your-linux-enterprise-server-performance/
How to Automate Restarts for Failed Services in Linux
https://tecadmin.net/automate-service-restart-linux/
How to Restore Deleted Files Under /etc Directory in Ubuntu
https://ubuntuhandbook.org/index.php/2025/03/restore-deleted-files-under-etc/
How To Replace Text In Multiple Files Using A Bash Script In Linux
https://ostechnix.com/replace-text-in-multiple-files-using-bash-script/
How To Manage Bash Functions Using declare Command In Linux
https://ostechnix.com/manage-bash-functions-using-declare-command/
How to build, deploy, and manage image mode for RHEL
https://developers.redhat.com/articles/2025/03/12/how-build-deploy-and-manage-image-mode-rhel
How to install MediaWiki on Fedora, CentOS, and RHEL servers.
https://fedoramagazine.org/how-to-install-mediawiki-on-fedora-centos-and-rhel-servers/
How to Speed Up SSH Access with Shortcuts and Auto-Complete
https://www.tecmint.com/ssh-command-shortcuts/
How to Free Up Space in Linux When Root (/) Partition Is Full
https://www.tecmint.com/fix-full-root-partition-linux/
Some of the content is generated by AI, please be cautious in identifying it.