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Test Your Knowledge in Computers #914
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In bash, grep -v -e '^[[:space:]]*$' file.txt will filter all the blank lines from file.txt and save the results in a file called file.txt.
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vconsole.conf(5) [centos man page]

VCONSOLE.CONF(5)						   vconsole.conf						  VCONSOLE.CONF(5)

NAME
vconsole.conf - Configuration file for the virtual console SYNOPSIS
/etc/vconsole.conf DESCRIPTION
The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font. It is applied at boot by systemd- vconsole-setup.service(8). The basic file format of the vconsole.conf is a newline-separated list of environment-like shell-compatible variable assignments. It is possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported, allowing applications to read the file without implementing a shell compatible execution engine. Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=, vconsole.font.unimap= may be used to override the console settings at boot. Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only as fallback. OPTIONS
The following options are understood: KEYMAP=, KEYMAP_TOGGLE= Configures the key mapping table for the keyboard. KEYMAP= defaults to "us" if not set. The KEYMAP_TOGGLE= can be used to configure a second toggle keymap and is by default unset. FONT=, FONT_MAP=, FONT_UNIMAP= Configures the console font, the console map and the unicode font map. EXAMPLE
Example 1. German keyboard and console /etc/vconsole.conf: KEYMAP=de-latin1 FONT=latarcyrheb-sun16 SEE ALSO
systemd(1), systemd-vconsole-setup.service(8), loadkeys(1), setfont(8), locale.conf(5), systemd-localed.service(8) systemd 208 VCONSOLE.CONF(5)

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LOCALE.CONF(5)                                                      locale.conf                                                     LOCALE.CONF(5)

NAME
locale.conf - Configuration file for locale settings SYNOPSIS
/etc/locale.conf DESCRIPTION
The /etc/locale.conf file configures system-wide locale settings. It is read at early boot by systemd(1). The basic file format of locale.conf is a newline-separated list of environment-like shell-compatible variable assignments. It is possible to source the configuration from shell scripts, however, beyond mere variable assignments, no shell features are supported, allowing applications to read the file without implementing a shell compatible execution engine. Note that the kernel command line options locale.LANG=, locale.LANGUAGE=, locale.LC_CTYPE=, locale.LC_NUMERIC=, locale.LC_TIME=, locale.LC_COLLATE=, locale.LC_MONETARY=, locale.LC_MESSAGES=, locale.LC_PAPER=, locale.LC_NAME=, locale.LC_ADDRESS=, locale.LC_TELEPHONE=, locale.LC_MEASUREMENT=, locale.LC_IDENTIFICATION= may be used to override the locale settings at boot. The locale settings configured in /etc/locale.conf are system-wide and are inherited by every service or user, unless overridden or unset by individual programs or individual users. Depending on the operating system, other configuration files might be checked for locale configuration as well, however only as fallback. /etc/vconsole.conf is usually created and updated using systemd-localed.service(8). localectl(1) may be used to alter the settings in this file during runtime from the command line. Use systemd-firstboot(1) to initialize them on mounted (but not booted) system images. OPTIONS
The following locale settings may be set using /etc/locale.conf: LANG=, LANGUAGE=, LC_CTYPE=, LC_NUMERIC=, LC_TIME=, LC_COLLATE=, LC_MONETARY=, LC_MESSAGES=, LC_PAPER=, LC_NAME=, LC_ADDRESS=, LC_TELEPHONE=, LC_MEASUREMENT=, LC_IDENTIFICATION=. Note that LC_ALL may not be configured in this file. For details about the meaning and semantics of these settings, refer to locale(7). EXAMPLE
Example 1. German locale with English messages /etc/locale.conf: LANG=de_DE.UTF-8 LC_MESSAGES=en_US.UTF-8 SEE ALSO
systemd(1), locale(7), localectl(1), systemd-localed.service(8), systemd-firstboot(1) systemd 237 LOCALE.CONF(5)

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