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haveged — Hardware-based random number generator. More information: <https://manned.org/haveged>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandhavegedgeneratorhardwareclirandombasednumber

linux

Problem

How to use the haveged command: Hardware-based random number generator. More information: <https://manned.org/haveged>.

haveged — Hardware-based random number generator. More information: <https://manned.org/haveged>.

Generate a random number:

sudo haveged

Run haveged in foreground:

sudo haveged {{[-F|--Foreground]}}

Set file path for output of haveged:

sudo haveged {{[-f|--file]}} {{path/to/file}}

Set run level for daemon:

sudo haveged {{[-r|--run]}} {{runlevel}}

Set collection buffer size in kibibyte words:

sudo haveged {{[-b|--buffer]}} {{buffersizeinKW}}

Insert a command to an already running haveged process or daemon:

sudo haveged {{[-c|--command]}} {{command}}

Set cache size in kibibyte words:

sudo haveged {{[-d|--data]}} {{cachesizeinKW}}

Set number of bytes to write to the output file:

sudo haveged {{[-n|--number]}} {{byteamount}}

Generate a random number

sudo haveged

Run `haveged` in foreground

sudo haveged {{[-F|--Foreground]}}

Set file path for output of `haveged`

sudo haveged {{[-f|--file]}} {{path/to/file}}

Set run level for daemon

sudo haveged {{[-r|--run]}} {{runlevel}}

Set collection buffer size in kibibyte words

sudo haveged {{[-b|--buffer]}} {{buffersizeinKW}}

tldr-pages: linux/haveged

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