ssh-copy-id on Linux: Passwordless SSH Login (ed25519 Keys)
Set up passwordless SSH with ssh-copy-id: generate ed25519 keys, copy pubkey to remote authorized_keys, test login, and harden…
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Linux screen Command: Persistent SSH Sessions (detach, reattach)
Use GNU screen on Linux for persistent terminals: screen -S name, detach with Ctrl+A D, reattach with screen…
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unzip and zip on Linux: Extract and Create Archives from the Terminal
Use unzip and zip on Linux to extract .zip files, list contents, create archives, and avoid path traversal…
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growpart on Linux: Resize Root Disk on AWS, Azure and KVM (cloud-init)
Expand a Linux root disk after your cloud provider increased volume size: growpart, rescan, resize2fs or xfs_growfs, LVM…
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systemd enable and disable on Linux: Start Services at Boot (systemctl)
Use systemctl enable and disable on Linux to control which services start at boot: enable, disable, start, stop,…
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Install open-vm-tools on Linux VMware Guest (Ubuntu, RHEL, time sync)
Install open-vm-tools on Linux VMs running on ESXi: apt and dnf packages, enable vmtoolsd, verify in Host Client,…
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Bash case Statement Shell Script: CLI Menu for Linux Ops Tasks
Build a Bash case statement script for Linux ops: status, reload, logs subcommands, validate input, usage text, and…
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Check if Process Is Running Shell Script (pgrep, Nagios, Cron)
Use a Bash script with pgrep to verify nginx, mysqld, or any daemon is running — exit 1…
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Find and Delete Old Files Shell Script (find -mtime, Dry-Run, Logs)
Delete old files safely on Linux with a Bash script: find -mtime retention, DRY_RUN preview, path allowlist, log…
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Wait for Port Open Shell Script (Bash Loop for MySQL, Redis, Deploy)
Block until a TCP port is open on Linux: Bash wait-for-port script with timeout, sleep interval, and use…
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