Bash Scripting Cheat Sheet
Write safer Bash scripts with arguments, quoting, arrays, conditions, functions, option parsing, temporary files, traps, and static checks.
Open cheat sheet6 organized subcategories
Linux
Shell commands, files, processes, networking, and permissions.
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Linux subcategories
48 focused guides grouped by the kind of task you need to complete.
7 guides
Shell, Files, and Automation
Work efficiently with shells, files, text, archives, backups, and schedules.
Browse subcategory 11 guidesIdentity, Access, and Security
Manage users, authentication, privileges, policy, auditing, and cryptography.
Browse subcategory 10 guidesProcesses, Services, and System
Operate processes, services, boot, packages, devices, logs, and kernel settings.
Browse subcategory 7 guidesStorage and Filesystems
Configure filesystems, volumes, RAID, memory-backed storage, and network shares.
Browse subcategory 7 guidesNetworking and Connectivity
Diagnose, route, secure, and connect Linux networks and services.
Browse subcategory 6 guidesContainers, Virtualization, and Performance
Isolate workloads, run virtual machines, control resources, and inspect performance.
Browse subcategory7 cheat sheets
Shell, Files, and Automation
Work efficiently with shells, files, text, archives, backups, and schedules.
Cron, at, and Anacron Scheduling Cheat Sheet
Schedule, validate, inspect, and troubleshoot recurring cron jobs, one-time at jobs, and catch-up anacron jobs safely on Linux.
Open cheat sheetLinux Archives and Compression Cheat Sheet
Create, inspect, extract, and verify tar archives and gzip or xz streams safely, with explicit destinations, exclusions, ownership controls, and checksums.
Open cheat sheetLinux Environment Variables and Shell Startup Cheat Sheet
Inspect, set, export, scope, persist, and debug Linux environment variables, PATH, locale, shell startup files, and systemd service environments.
Open cheat sheetLinux Files and Directories Cheat Sheet
Navigate, inspect, create, copy, move, search, and safely remove Linux files and directories from the shell.
Open cheat sheetLinux Text Processing Cheat Sheet
Filter, transform, extract, sort, count, and summarize text safely with grep, sed, awk, cut, sort, uniq, tr, and wc.
Open cheat sheetrsync and Incremental Backups Cheat Sheet
Synchronize files and build recoverable rsync backups with dry runs, safe deletion, SSH transport, hard-linked snapshots, verification, and restore testing.
Open cheat sheet11 cheat sheets
Identity, Access, and Security
Manage users, authentication, privileges, policy, auditing, and cryptography.
AppArmor Profiles and Troubleshooting Cheat Sheet
Inspect AppArmor confinement, author least-privilege profiles, diagnose denials, validate policy, and deploy or roll back changes safely.
Open cheat sheetLinux Audit Framework and auditd Cheat Sheet
Inspect Linux Audit health, design efficient rules, manage persistent auditd policy, search complete events, and protect audit evidence safely.
Open cheat sheetLinux Capabilities and File Attributes Cheat Sheet
Audit and manage Linux process capabilities, file capabilities, securebits, systemd bounding sets, extended attributes, and immutable or append-only flags.
Open cheat sheetLinux PAM Authentication Cheat Sheet
Understand and troubleshoot Linux PAM stacks, control flags, module types, password policy, lockouts, access rules, sessions, and safe configuration changes.
Open cheat sheetLinux Permissions Cheat Sheet
Inspect and manage Linux file modes, ownership, default permissions, and special directory permissions safely.
Open cheat sheetLinux sudoers Policy and Privilege Delegation Cheat Sheet
Design least-privilege sudoers policy, validate changes with visudo, constrain commands and run-as identities, and audit delegated access safely.
Open cheat sheetLinux Users and Groups Cheat Sheet
Inspect and administer Linux user and group identities, supplementary membership, passwords, account aging, shells, and retirement with explicit safeguards.
Open cheat sheetOpenSSH Connections and File Transfer Cheat Sheet
Connect, authenticate, forward ports, verify host keys, copy files, configure aliases, and troubleshoot OpenSSH clients safely.
Open cheat sheetOpenSSL TLS and Certificate Inspection Cheat Sheet
Inspect certificates, CSRs, private keys, PKCS#12 bundles, verification chains, and live TLS endpoints safely with current OpenSSL commands.
Open cheat sheetSELinux Administration and Troubleshooting Cheat Sheet
Inspect SELinux state, diagnose AVC denials, manage persistent file labels, booleans, ports, and narrowly scoped troubleshooting safely.
Open cheat sheetSSSD and Directory Integration Cheat Sheet
Integrate Linux with Active Directory, FreeIPA, or LDAP through SSSD using secure discovery, identity lookup, access policy, caching, and diagnostics.
Open cheat sheet10 cheat sheets
Processes, Services, and System
Operate processes, services, boot, packages, devices, logs, and kernel settings.
Core Dumps, strace, and Linux Debugging Cheat Sheet
Diagnose Linux crashes and system-call failures with coredumpctl, GDB, strace, procfs, debuginfo, resource limits, and privacy-aware evidence handling.
Open cheat sheetLinux Boot and initramfs Diagnostics Cheat Sheet
Trace Linux boot stages, inspect kernel arguments and initramfs contents, analyze systemd startup, and recover failed boots with controlled changes.
Open cheat sheetLinux Kernel Modules and sysctl Cheat Sheet
Inspect, load, configure, persist, validate, and troubleshoot Linux kernel modules and sysctl parameters without bypassing safety controls.
Open cheat sheetLinux Package Management Cheat Sheet
Inspect, search, install, upgrade, verify, and remove packages with APT, DNF, and Flatpak while respecting repositories and transaction safety.
Open cheat sheetLinux Processes Cheat Sheet
Inspect, find, monitor, prioritize, background, wait for, and safely signal Linux processes with ps, top, pgrep, jobs, nice, and kill.
Open cheat sheetLinux Time Synchronization and chrony Cheat Sheet
Configure, verify, and troubleshoot chronyd time synchronization with NTP, NTS, source selection, clock stepping, RTC policy, and safe fleet operations.
Open cheat sheetlogrotate and Linux Log Retention Cheat Sheet
Design, test, and troubleshoot logrotate policies with safe rotation, retention, compression, ownership, signaling, state files, and systemd scheduling.
Open cheat sheetsystemd Services and Journal Cheat Sheet
Inspect and operate systemd services with systemctl, then filter current-boot, unit, time, priority, kernel, and live logs with journalctl.
Open cheat sheetsystemd Timers and Scheduled Jobs Cheat Sheet
Create, inspect, validate, enable, troubleshoot, and harden systemd timer and service units with calendar, monotonic, persistent, randomized, and dependency-aware scheduling.
Open cheat sheetudev Rules and Linux Device Events Cheat Sheet
Observe Linux device events, inspect sysfs attributes, write deterministic udev rules, validate matching, and deploy changes safely.
Open cheat sheet7 cheat sheets
Storage and Filesystems
Configure filesystems, volumes, RAID, memory-backed storage, and network shares.
ext4, XFS, and Filesystem Repair Cheat Sheet
Inspect, check, and safely repair ext4 and XFS filesystems with mount-state verification, backups, e2fsck, xfs_repair, recovery planning, and diagnostics.
Open cheat sheetLinux Software RAID with mdadm Cheat Sheet
Design, create, assemble, monitor, scrub, repair, and reshape Linux MD software RAID arrays safely with mdadm and kernel MD interfaces.
Open cheat sheetLinux Storage and Filesystems Cheat Sheet
Inspect Linux block devices, filesystems, mounts, space and inode use, fstab configuration, busy mount points, and safe synchronization.
Open cheat sheetLVM Logical Volume Management Cheat Sheet
Administer LVM physical volumes, volume groups, logical volumes, thin pools, snapshots, migrations, activation, and metadata recovery safely.
Open cheat sheetNFS and autofs Cheat Sheet
Operate Linux NFS clients, servers, and autofs mounts with version negotiation, Kerberos security, resilient mount options, diagnostics, and safe recovery.
Open cheat sheetSamba File Sharing Cheat Sheet
Configure and troubleshoot secure Samba file shares with smb.conf validation, ACLs, protocol hardening, client tests, sessions, and safe reloads.
Open cheat sheetSwap, zram, and Memory Pressure Cheat Sheet
Diagnose Linux memory pressure and operate swap, zram, zswap, PSI, reclaim, and OOM behavior with capacity planning and safe change procedures.
Open cheat sheet7 cheat sheets
Networking and Connectivity
Diagnose, route, secure, and connect Linux networks and services.
curl and HTTP Debugging Cheat Sheet
Inspect HTTP requests, response headers, redirects, TLS, timing, status failures, JSON payloads, authentication, downloads, retries, and proxies with curl.
Open cheat sheetiproute2 Routing and Traffic Control Cheat Sheet
Inspect and change Linux routes, policy rules, neighbors, links, namespaces, and traffic control with iproute2, rollback planning, and persistent configuration.
Open cheat sheetLinux DNS Resolution and Resolver Tools Cheat Sheet
Diagnose Linux name resolution with getent, dig, resolvectl, NSS, split DNS, resolver caches, and DNSSEC-aware checks without confusing application and DNS paths.
Open cheat sheetLinux Network Diagnostics Cheat Sheet
Diagnose Linux connectivity layer by layer with ip, ping, ss, getent, dig, and curl while separating local, DNS, transport, and HTTP failures.
Open cheat sheetLinux nftables Firewall Cheat Sheet
Inspect, validate, trace, back up, and manage nftables tables, chains, rules, sets, counters, and atomic ruleset changes safely.
Open cheat sheetNetworkManager Wi-Fi and Connections Cheat Sheet
Manage Linux Wi-Fi and NetworkManager connection profiles with nmcli, safe activation, secret handling, routing, DNS, checkpoints, and diagnostics.
Open cheat sheetWireGuard VPN Cheat Sheet
Configure and troubleshoot WireGuard tunnels on Linux with safe key handling, AllowedIPs, routing, firewalls, NAT, MTU, and key rotation.
Open cheat sheet6 cheat sheets
Containers, Virtualization, and Performance
Isolate workloads, run virtual machines, control resources, and inspect performance.
cgroup v2 Resource Control Cheat Sheet
Identify cgroup v2, apply CPU, memory, I/O, and task controls with systemd, inspect pressure and limit events, and understand safe hierarchy and delegation rules.
Open cheat sheetContainers with Podman Cheat Sheet
Run and operate rootless Podman containers with secure defaults, durable storage, health checks, Quadlet services, secrets, updates, and recoverable backups.
Open cheat sheetLinux Namespaces, unshare, and nsenter Cheat Sheet
Inspect Linux namespace membership, create scoped user, mount, PID, UTS, and network namespaces, and enter target namespaces safely with unshare, nsenter, and lsns.
Open cheat sheetLinux Performance Observability Cheat Sheet
Measure Linux CPU, memory, I/O, pressure, and per-process behavior with procps, sysstat, PSI, and perf using a production-safe workflow.
Open cheat sheetperf, ftrace, and eBPF Observability Cheat Sheet
Use Linux perf, ftrace, tracepoints, BPF, bpftool, and bpftrace for production observability with bounded overhead, symbol safety, and cleanup.
Open cheat sheetQEMU, KVM, and libvirt Cheat Sheet
Validate KVM hosts and operate libvirt virtual machines with safe lifecycle, storage, networking, guest-agent, backup, migration, and security practices.
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