{
    "mode": "man",
    "parameter": "wall",
    "section": "1",
    "url": "https://www.chedong.com/phpMan.php/man/wall/1/json",
    "generated": "2026-05-30T05:09:48Z",
    "synopsis": "wall [-n] [-t timeout] [-g group] [message | file]",
    "sections": {
        "NAME": {
            "content": "wall - write a message to all users\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "wall [-n] [-t timeout] [-g group] [message | file]\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "wall displays a message, or the contents of a file, or otherwise its standard input, on the\nterminals of all currently logged in users. The command will wrap lines that are longer than\n79 characters. Short lines are whitespace padded to have 79 characters. The command will\nalways put a carriage return and new line at the end of each line.\n\nOnly the superuser can write on the terminals of users who have chosen to deny messages or\nare using a program which automatically denies messages.\n\nReading from a file is refused when the invoker is not superuser and the program is\nset-user-ID or set-group-ID.\n",
            "subsections": []
        },
        "OPTIONS": {
            "content": "",
            "subsections": [
                {
                    "name": "-n --nobanner",
                    "content": "Suppress the banner.\n",
                    "flag": "-n",
                    "long": "--nobanner"
                },
                {
                    "name": "-t --timeout",
                    "content": "Abandon the write attempt to the terminals after timeout seconds. This timeout must be a\npositive integer. The default value is 300 seconds, which is a legacy from the time when\npeople ran terminals over modem lines.\n",
                    "flag": "-t",
                    "long": "--timeout"
                },
                {
                    "name": "-g --group",
                    "content": "Limit printing message to members of group defined as a group argument. The argument can\nbe group name or GID.\n",
                    "flag": "-g",
                    "long": "--group"
                },
                {
                    "name": "-V --version",
                    "content": "Display version information and exit.\n",
                    "flag": "-V",
                    "long": "--version"
                },
                {
                    "name": "-h --help",
                    "content": "Display help text and exit.\n",
                    "flag": "-h",
                    "long": "--help"
                }
            ]
        },
        "NOTES": {
            "content": "Some sessions, such as wdm(1x), that have in the beginning of utmp(5) uttype data a ':'\ncharacter will not get the message from wall. This is done to avoid write errors.\n",
            "subsections": []
        },
        "HISTORY": {
            "content": "A wall command appeared in Version 7 AT&T UNIX.\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "mesg(1), talk(1), write(1), shutdown(8)\n",
            "subsections": []
        },
        "REPORTING BUGS": {
            "content": "For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.\n",
            "subsections": []
        },
        "AVAILABILITY": {
            "content": "The wall command is part of the util-linux package which can be downloaded from Linux Kernel\nArchive <https://www.kernel.org/pub/linux/utils/util-linux/>.\n\n\n\nutil-linux 2.37.2                            2021-06-02                                      WALL(1)",
            "subsections": []
        }
    },
    "summary": "wall - write a message to all users",
    "flags": [
        {
            "flag": "-n",
            "long": "--nobanner",
            "arg": null,
            "description": "Suppress the banner."
        },
        {
            "flag": "-t",
            "long": "--timeout",
            "arg": null,
            "description": "Abandon the write attempt to the terminals after timeout seconds. This timeout must be a positive integer. The default value is 300 seconds, which is a legacy from the time when people ran terminals over modem lines."
        },
        {
            "flag": "-g",
            "long": "--group",
            "arg": null,
            "description": "Limit printing message to members of group defined as a group argument. The argument can be group name or GID."
        },
        {
            "flag": "-V",
            "long": "--version",
            "arg": null,
            "description": "Display version information and exit."
        },
        {
            "flag": "-h",
            "long": "--help",
            "arg": null,
            "description": "Display help text and exit."
        }
    ],
    "examples": [],
    "see_also": [
        {
            "name": "mesg",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/mesg/1/json"
        },
        {
            "name": "talk",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/talk/1/json"
        },
        {
            "name": "write",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/write/1/json"
        },
        {
            "name": "shutdown",
            "section": "8",
            "url": "https://www.chedong.com/phpMan.php/man/shutdown/8/json"
        }
    ]
}