rsync Backup Shell Script for Linux (SSH, Retention and Cron)
Automate rsync backups on Linux with a Bash script: SSH key auth, --delete mirror option, log each run,…
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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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xargs Command on Linux: Safe find Pipelines, -0, -I and Parallel Runs
Use xargs on Linux to turn line input into command arguments: find -print0 | xargs -0, avoid word…
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ulimit on Linux: Fix “Too Many Open Files” (nofile, limits.conf, systemd)
Increase open file limits on Linux: ulimit -n, soft vs hard limits, /etc/security/limits.conf, systemd LimitNOFILE=, prlimit, and verify…
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Linux reboot and shutdown Commands: Safe Server Restarts (systemctl, shutdown)
Reboot or shut down Linux safely: reboot, shutdown -h now, systemctl reboot, schedule maintenance, warn users with wall,…
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jq Command on Linux: Parse JSON from curl, APIs and kubectl
Master jq on Linux: install jq, select fields with dot notation, filter arrays, pipe curl and kubectl output,…
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