How to replace a character in a file Post: 302087267

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Replace character in a file.

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kernel-command-line

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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How to replace a character in the file?

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read in a file character by character - replace any unknown ASCII characters with spa

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