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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watch Command on Linux: Monitor df, ss, and Logs Every Few Seconds
Use watch on Linux to rerun commands on an interval: watch -n 2 df -h, highlight changes with…
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umask on Linux: Default File Permissions Explained (022, 027, sftp)
Understand umask on Linux: how 022 and 027 change new file and directory modes, set umask in shell…
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dmesg on Linux: Read Kernel Logs (Hardware, OOM, USB, Disk Errors)
Use dmesg on Linux for kernel ring buffer messages: dmesg -T timestamps, follow with -w, find OOM kills…
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tcpdump on Linux: Capture Packets by Port and Host (Filters & pcap)
Learn tcpdump on Linux: choose interface, capture to pcap, BPF filters for host and port, read files with…
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strace on Linux: Debug Slow Scripts and Permission Errors (Syscalls)
Use strace on Linux to see syscalls: trace open, connect, and read failures, attach to running PIDs, filter…
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