Operating Systems

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. All computer programs, excluding firmware, require an operating system to function

Analizar el rendimiento de Linux realizando una conexión SSH desde PowerShell en Windows

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osquery

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osquery is an operating system instrumentation framework for OS X/macOS, Windows, and Linux. The tools make low-level operating system analytics and […]


Linux Performance

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This page links to various Linux performance material I’ve created, including the tools maps on the right. The first is […]


Programación de permisos en Linux

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Funciones para la programación de permisos en Linux chown (System Call) chmod (System Call) chmod (System Call) (Example) umask (System […]


Programación de procesos en Linux

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Introducción a la gestión de procesos en Linux Ejercicios de gestión de procesos (ejercicios 1) Ejercicios de gestión de procesos […]


getpid, getppid, getuid, geteuid, getgid and getegid (System Calls) (ejemplo)

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getuid, geteuid, getgid and getegid (System Calls) (example)

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shmctl (System Call)

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NAME shmctl – XSI shared memory control operations SYNOPSIS

DESCRIPTION The shmctl() function operates on XSI shared memory (see […]


getegid (System Call)

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NAME getegid – get the effective group ID SYNOPSIS

DESCRIPTION The getegid() function shall return the effective group ID […]


shmat (System Call)

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NAME shmat – XSI shared memory attach operation SYNOPSIS

DESCRIPTION The shmat() function operates on XSI shared memory (see […]


getgid (System Call)

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NAME getgid – get the real group ID SYNOPSIS

DESCRIPTION The getgid() function shall return the real group ID […]


ftok (System Call)

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NAME ftok – generate an IPC key SYNOPSIS

DESCRIPTION The ftok() function shall return a key based on path […]


geteuid (System Call)

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NAME geteuid – get the effective user ID SYNOPSIS

DESCRIPTION The geteuid() function shall return the effective user ID […]


umask (System Call)

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NAME umask – set and get the file mode creation mask SYNOPSIS

DESCRIPTION The umask() function shall set the […]


getuid (System Call)

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NAME getuid – get a real user ID SYNOPSIS

DESCRIPTION The getuid() function shall return the real user ID […]


shmget (System Call)

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NAME shmget – get an XSI shared memory segment SYNOPSIS

DESCRIPTION The shmget() function operates on XSI shared memory […]