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Operating Systems Linux Red Hat Grub.conf kernel field boot messages verbosity configuration Post 302877861 by fpmurphy on Tuesday 3rd of December 2013 02:41:36 PM
Old 12-03-2013
quiet and debug are Linux kernel command line parameters. They are not specific to GRUB.

See https://www.kernel.org/doc/Documenta...parameters.txt

quiet just disables most kernel log messages. Removing quiet reverts level of kernel log messages back to default.

verbose is a hack on some Linux distributions. If present on the kernel command line, one of the initialization files - such as /etc/rc.sysinit, or /etc/rc.d/rc.sysinit - does something like the following:
Code:
if /bin/grep -q " verbose" /proc/cmdline; then /bin/dmesg -n 8; fi

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KERNEL-COMMAND-LINE(7)						kernel-command-line					    KERNEL-COMMAND-LINE(7)

NAME
kernel-command-line - Kernel command line parameters SYNOPSIS
/proc/cmdline DESCRIPTION
The kernel, the initial RAM disk (initrd) and basic userspace functionality may be configured at boot via kernel command line arguments. For command line parameters understood by the kernel, please see kernel-parameters.txt[1] and bootparam(7). For command line parameters understood by the initial RAM disk, please see dracut.cmdline(7), or the documentation of the specific initrd implementation of your installation. CORE OS COMMAND LINE ARGUMENTS
systemd.unit=, rd.systemd.unit=, systemd.dump_core=, systemd.crash_shell=, systemd.crash_chvt=, systemd.confirm_spawn=, systemd.show_status=, systemd.log_target=, systemd.log_level=, systemd.log_color=, systemd.log_location=, systemd.default_standard_output=, systemd.default_standard_error=, systemd.setenv= Parameters understood by the system and service manager to control system behavior. For details, see systemd(1). quiet Parameter understood by both the kernel and the system and service manager to control console log verbosity. For details, see systemd(1). debug Parameter understood by both the kernel and the system and service manager to control console log verbosity. For details, see systemd(1). -b, emergency, single, s, S, 1, 2, 3, 4, 5 Parameters understood by the system and service manager, as compatibility options. For details, see systemd(1). 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= Parameters understood by the system and service manager to control locale and language settings. For details, see systemd(1). fsck.mode= Parameter understood by the file system checker services. For details, see systemd-fsck@.service(8). quotacheck.mode= Parameter understood by the file quota checker service. For details, see systemd-quotacheck.service(8). systemd.journald.forward_to_syslog=, systemd.journald.forward_to_kmsg=, systemd.journald.forward_to_console= Parameters understood by the journal service. For details, see systemd-journald.service(8). vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=, vconsole.font.unimap= Parameters understood by the virtual console setup logic. For details, see systemd-vconsole-setup.service(8). udev.log-priority=, rd.udev.log-priority=, udev.children-max=, rd.udev.children-max=, udev.exec-delay=, rd.udev.exec-delay=, net.ifnames= Parameters understood by the device event managing daemon. For details, see systemd-udevd.service(8). plymouth.enable= May be used to disable the Plymouth boot splash. For details, see plymouth(8). luks=, rd.luks=, luks.crypttab=, rd.luks.crypttab=, luks.uuid=, rd.luks.uuid=, luks.options=, rd.luks.options=, luks.key=, rd.luks.key= Configures the LUKS full-disk encryption logic at boot. For details, see systemd-cryptsetup-generator(8). fstab=, rd.fstab= Configures the /etc/fstab logic at boot. For details, see systemd-fstab-generator(8). modules-load=, rd.modules-load= Load a specific kernel module early at boot. For details, see systemd-modules-load.service(8). SEE ALSO
systemd(1), bootparam(7), dracut.cmdline(7), systemd-fsck@.service(8), systemd-quotacheck.service(8), systemd-journald.service(8), systemd- vconsole-setup.service(8), systemd-udevd.service(8), plymouth(8), systemd-cryptsetup-generator(8), systemd-fstab-generator(8), systemd- modules-load.service(8) NOTES
1. kernel-parameters.txt https://www.kernel.org/doc/Documentation/kernel-parameters.txt systemd 208 KERNEL-COMMAND-LINE(7)
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