Author: Willie

Willie has over 15 years of experience in Linux system administration and DevOps. After managing infrastructure for startups and enterprises alike, he founded Command Linux to share the practical knowledge he wished he had when starting out. He oversees content strategy and contributes guides on server management, automation, and security.

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FCNTL

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NAME fcntl – manipulate file descriptor SYNOPSIS #include <unistd.h> #include <fcntl.h> int fcntl(int fd, int cmd, … /* arg */ ); DESCRIPTION fcntl() performs one of the operations described below on the open file descriptor fd. The operation is determined by cmd. fcntl() can take an optional third argument. Whether or not this argument is required is determined by cmd. The required argument type is indicated in parentheses after each cmd name (in most cases, the required type is int, and we identify the argument using the name arg), or void is specified if the argument is not…

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SYSTEMD-JOURNALD.SERVICE

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NAME systemd-journald.service, systemd-journald.socket, systemd-journald-dev-log.socket, systemd-journald – Journal service SYNOPSIS systemd-journald.service systemd-journald.socket systemd-journald-dev-log.socket /lib/systemd/systemd-journald DESCRIPTION systemd-journald is a system service that collects and stores logging data. It creates and maintains structured, indexed journals based on logging information that is received from the kernel, from user processes via the libc syslog(3) call, from standard input and standard error of system services or via its native API. It will implicitly collect numerous metadata fields for each log messages in a secure and unfakeable way. See systemd.journal-fields(7) for more information about the collected metadata. Log data collected by the journal is primarily…

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LIBTOOL

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NAME libtool – Provide generalized library-building support services SYNOPSIS libtool [,OPTION/]… [,MODE-ARG/]… libtool [,OPTION/]… ,–mode=compile COMPILE-COMMAND/… ,SOURCEFILE/ libtool [,OPTION/]… ,–mode=link LINK-COMMAND/… libtool [,OPTION/]… ,–mode=execute COMMAND /[,ARGS/]… libtool [,OPTION/]… ,–mode=install INSTALL-COMMAND/… libtool [,OPTION/]… ,–mode=finish /[,LIBDIR/]… libtool [,OPTION/]… ,–mode=uninstall RM /[,RM-OPTION/]… ,FILE/… libtool [,OPTION/]… ,–mode=clean RM /[,RM-OPTION/]… ,FILE/… DESCRIPTION Provide generalized library-building support services. –config show all configuration variables –debug enable verbose shell tracing -n, –dry-run display commands without modifying any files –features display basic configuration information and exit –mode=,MODE/ use operation mode MODE –preserve-dup-deps don’t remove duplicate dependency libraries –quiet, –silent don’t print informational messages –no-quiet, –no-silent print informational…

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SYSTEMD-TTY-ASK-PASSWORD-AGENT

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NAME systemd-tty-ask-password-agent – List or process pending systemd password requests SYNOPSIS systemd-tty-ask-password-agent [OPTIONS…] [VARIABLE=VALUE…] DESCRIPTION systemd-tty-ask-password-agent is a password agent that handles password requests of the system, for example for hard disk encryption passwords or SSL certificate passwords that need to be queried at boot-time or during runtime. systemd-tty-ask-password-agent implements the m[blue]Password Agents Specificationm[][1]. OPTIONS The following options are understood: –list Lists all currently pending system password requests. –query Process all currently pending system password requests by querying the user on the calling TTY. –watch Continuously process password requests. –wall Forward password requests to wall(1) instead of…

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