Tag: linux

Linux strace:See What a Stuck Process Is Waiting On

Hands-on strace recipes — attach to a PID, follow children, filter syscalls, and read the wait that logs never mentioned.

Linux

Linux tar and gzip:Archive, Compress, and Restore Without Corrupt Surprises

Hands-on tar and gzip recipes — create an archive, inspect it before extract, compress with gzip, and restore without clobbering the wrong tree.

Linux

Linux cut, sort, uniq, and tr:Shape Text Before You Pipe to awk

Hands-on text-prep recipes — slice columns, sort keys, count uniques, and translate characters before you reach for awk or sed.

Linux

Linux ssh, scp, and Port Forwarding:Reach a Remote Box Without Guesswork

Hands-on SSH recipes — keys and config, copy files with scp, and tunnel a port without memorizing every flag.

Linux

Linux cron and systemd Timers:Run Jobs on a Schedule You Can Trust

Hands-on crontab and systemd timer recipes — schedule a job, choose calendar vs boot delays, and find the run that never fired.

Linux

Linux systemctl:Start, Stop, and Debug systemd Units

Hands-on systemctl recipes for everyday work — inspect units, start and stop services, enable at boot, and debug failed units without guessing.

Linux

Linux Troubleshooting Toolkit:Diagnose Crashes and High Load

Hands-on triage with htop, journalctl, dmesg, and lsof — diagnose high load and crashes by chaining the right tool at each step.

Linux

Advanced File Search & Manipulation:find, xargs, and sed

Hands-on batch editing on the command line — find the right files, feed them safely through xargs, and rewrite them with sed.

Linux

Linux rsync:Sync Files Efficiently, Locally and Remote

Hands-on rsync recipes for everyday work — incremental sync, remote backups over SSH, progress output, and safe dry-runs.

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Linux sudo and /etc/sudoers:Manage Privileged Access with Intent

Hands-on sudo and sudoers recipes — run commands as root or another user, edit policy safely with visudo, and delegate fine-grained privileges without handing out full root.

Linux

Linux du and df:Find Disk Space Hogs

Hands-on df and du recipes — check filesystem free space, hunt directory hogs, and resolve “no space left on device” with confidence.

Linux

Linux ss and netstat:Monitor Network Connections

Hands-on ss and netstat recipes — list listening sockets, inspect open connections, check routing tables, and read interface statistics.

Linux

Linux kill, pkill, and killall:Send Signals Safely

Hands-on kill, pkill, and killall recipes — choose SIGTERM, SIGKILL, or SIGHUP, target the right PIDs, and stop processes without wrecking managed services.

Linux

Linux lsof:See Who Is Using a File or Port

Hands-on lsof recipes for everyday work — find which processes hold files open, bind ports, or leak file descriptors.

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Linux chmod, chown, and umask:Control Who Can Touch a File

Hands-on chmod, chown, and umask recipes — decode numeric vs symbolic modes, fix ownership, and understand default permissions for new files.

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Linux xargs:Turn Lists into Command Arguments

Hands-on xargs recipes for everyday work — feed find and grep into commands, batch safely, and place arguments where they belong.

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Linux journalctl:Query the systemd Journal

Hands-on journalctl recipes for everyday work — filter by unit, severity, time range, and boot, then read the results with confidence.

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Linux sed:Edit Streams Without Opening an Editor

Hands-on sed recipes for everyday work — substitute text, delete lines, edit files in place, and reshape output in pipelines.

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Linux ps and pgrep:Find Running Processes

Hands-on ps and pgrep recipes — locate processes by PID, user, memory footprint, or command path without a live monitor.

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Linux dmesg:Read the Kernel Ring Buffer

Hands-on dmesg recipes for everyday work — inspect boot messages, chase hardware faults, filter by level, and watch the kernel live.

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Linux top, htop, and btop:Watch CPU, RAM, and Load

Hands-on top, htop, and btop recipes — read load averages, find CPU and memory hogs, and triage a busy box in real time.

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Linux find:Locate Files by What You Know

Hands-on find recipes for everyday work — hunt by name, type, size, and time, then act on matches with confidence.

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Linux awk:Slice Fields and Summarize Streams

Hands-on awk recipes for everyday work — pick columns, filter rows, change separators, and compute totals in pipelines.

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Linux grep:Search Files Like You Mean It

Hands-on grep recipes for everyday work — find text, filter logs, search codebases, and pipe results with confidence.

Linux

Linux Common Directories:Know Where Things Live

Learn the Linux filesystem hierarchy — what /, /etc, /var, /usr, /home and friends are for, and when to look in each one.