Name

sysctl - configure kernel parameters at runtime

Synopsis

# sysctl [-a] [-w] [variable[=value]...]

Description

sysctl is a utility for managing kernel configuration parameters at runtime. This requires root privileges, and can crash your system. Available parameters are listed under /proc/sys/.

Options

• -a: Display all kernel parameters and associated values.
• -w: Set kernel parameters to the specified values.

Arguments

• variable: Retrieve the specified parameter.
• variable=value: Set the specified parameter to the specified value. The option -w has to be specified.

Files

• /proc/sys - source of kernel parameters

Examples

View all parameters:

# sysctl -a

View ubsan_is_deadly parameter:

# sysctl ubsan_is_deadly
ubsan_is_deadly = 1

Set ubsan_is_deadly parameter to zero (disabled): (Note: This requires root privileges)

# su
# sysctl -w ubsan_is_deadly=0
ubsan_is_deadly: 1 -> 0