{ "content": [ { "type": "text", "text": "# SYSTEMD-CAT (info)\n\n## NAME\n\nsystemd-cat - Connect a pipeline or program's output with the journal\n\n## SYNOPSIS\n\nsystemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...]\nsystemd-cat [OPTIONS...]\n\n## DESCRIPTION\n\nsystemd-cat may be used to connect the standard input and output of a\nprocess to the journal, or as a filter tool in a shell pipeline to pass\nthe output the previous pipeline element generates to the journal.\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS**\n- **DESCRIPTION**\n- **OPTIONS** (2 subsections)\n- **EXIT STATUS**\n- **EXAMPLES**\n- **SEE ALSO**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n" } ], "structuredContent": { "command": "SYSTEMD-CAT", "section": "", "mode": "info", "summary": "systemd-cat - Connect a pipeline or program's output with the journal", "synopsis": "systemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...]\nsystemd-cat [OPTIONS...]", "tldr_summary": null, "tldr_examples": [], "tldr_source": null, "flags": [ { "flag": "-h", "long": "--help", "arg": null, "description": "Print a short help text and exit." }, { "flag": "", "long": "--version", "arg": null, "description": "Print a short version string and exit. -t, --identifier= Specify a short string that is used to identify the logging tool. If not specified, no identification string is written to the journal. -p, --priority= Specify the default priority level for the logged messages. Pass one of \"emerg\", \"alert\", \"crit\", \"err\", \"warning\", \"notice\", \"info\", \"debug\", or a value between 0 and 7 (corresponding to the same named levels). These priority values are the same as defined by syslog(3). Defaults to \"info\". Note that this simply controls the default, individual lines may be logged with different levels if they are prefixed accordingly. For details, see --level-prefix= below. --stderr-priority= Specifies the default priority level for messages from the process's standard error output (stderr). Usage of this option is the same as the --priority= option, above, and both can be used at once. When both are used, --priority= will specify the default priority for standard output (stdout). If --stderr-priority= is not specified, messages from stderr will still be logged, with the same default priority level as stdout. Also, note that when stdout and stderr use the same default priority, the messages will be strictly ordered, because one channel is used for both. When the default priority differs, two channels are used, and so stdout messages will not be strictly ordered with respect to stderr messages - though they will tend to be approximately ordered. --level-prefix= Controls whether lines read are parsed for syslog priority level prefixes. If enabled (the default), a line prefixed with a priority prefix such as \"<5>\" is logged at priority 5 (\"notice\"), and similar for the other priority levels. Takes a boolean argument." } ], "examples": [ "Example 1. Invoke a program", "This calls /bin/ls with standard output and error connected to the", "journal:", "# systemd-cat ls", "Example 2. Usage in a shell pipeline", "This builds a shell pipeline also invoking /bin/ls and writes the", "output it generates to the journal:", "# ls | systemd-cat", "Even though the two examples have very similar effects the first is", "preferable since only one process is running at a time, and both stdout", "and stderr are captured while in the second example, only stdout is", "captured." ], "see_also": [ { "name": "systemd", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/systemd/1/json" }, { "name": "systemctl", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/systemctl/1/json" }, { "name": "logger", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/logger/1/json" } ], "section_outline": [ { "name": "NAME", "lines": 2, "subsections": [] }, { "name": "SYNOPSIS", "lines": 4, "subsections": [] }, { "name": "DESCRIPTION", "lines": 11, "subsections": [] }, { "name": "OPTIONS", "lines": 2, "subsections": [ { "name": "-h, --help", "lines": 2, "flag": "-h", "long": "--help" }, { "name": "--version", "lines": 40, "long": "--version" } ] }, { "name": "EXIT STATUS", "lines": 2, "subsections": [] }, { "name": "EXAMPLES", "lines": 19, "subsections": [] }, { "name": "SEE ALSO", "lines": 3, "subsections": [] } ], "sections": { "NAME": { "content": "systemd-cat - Connect a pipeline or program's output with the journal\n", "subsections": [] }, "SYNOPSIS": { "content": "systemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...]\n\nsystemd-cat [OPTIONS...]\n", "subsections": [] }, "DESCRIPTION": { "content": "systemd-cat may be used to connect the standard input and output of a\nprocess to the journal, or as a filter tool in a shell pipeline to pass\nthe output the previous pipeline element generates to the journal.\n\nIf no parameter is passed, systemd-cat will write everything it reads\nfrom standard input (stdin) to the journal.\n\nIf parameters are passed, they are executed as command line with\nstandard output (stdout) and standard error output (stderr) connected\nto the journal, so that all it writes is stored in the journal.\n", "subsections": [] }, "OPTIONS": { "content": "The following options are understood:\n", "subsections": [ { "name": "-h, --help", "content": "Print a short help text and exit.\n", "flag": "-h", "long": "--help" }, { "name": "--version", "content": "Print a short version string and exit.\n\n-t, --identifier=\nSpecify a short string that is used to identify the logging tool.\nIf not specified, no identification string is written to the\njournal.\n\n-p, --priority=\nSpecify the default priority level for the logged messages. Pass\none of \"emerg\", \"alert\", \"crit\", \"err\", \"warning\", \"notice\",\n\"info\", \"debug\", or a value between 0 and 7 (corresponding to the\nsame named levels). These priority values are the same as defined\nby syslog(3). Defaults to \"info\". Note that this simply controls\nthe default, individual lines may be logged with different levels\nif they are prefixed accordingly. For details, see --level-prefix=\nbelow.\n\n--stderr-priority=\nSpecifies the default priority level for messages from the\nprocess's standard error output (stderr). Usage of this option is\nthe same as the --priority= option, above, and both can be used at\nonce. When both are used, --priority= will specify the default\npriority for standard output (stdout).\n\nIf --stderr-priority= is not specified, messages from stderr will\nstill be logged, with the same default priority level as stdout.\n\nAlso, note that when stdout and stderr use the same default\npriority, the messages will be strictly ordered, because one\nchannel is used for both. When the default priority differs, two\nchannels are used, and so stdout messages will not be strictly\nordered with respect to stderr messages - though they will tend to\nbe approximately ordered.\n\n--level-prefix=\nControls whether lines read are parsed for syslog priority level\nprefixes. If enabled (the default), a line prefixed with a priority\nprefix such as \"<5>\" is logged at priority 5 (\"notice\"), and\nsimilar for the other priority levels. Takes a boolean argument.\n", "long": "--version" } ] }, "EXIT STATUS": { "content": "On success, 0 is returned, a non-zero failure code otherwise.\n", "subsections": [] }, "EXAMPLES": { "content": "Example 1. Invoke a program\n\nThis calls /bin/ls with standard output and error connected to the\njournal:\n\n# systemd-cat ls\n\nExample 2. Usage in a shell pipeline\n\nThis builds a shell pipeline also invoking /bin/ls and writes the\noutput it generates to the journal:\n\n# ls | systemd-cat\n\nEven though the two examples have very similar effects the first is\npreferable since only one process is running at a time, and both stdout\nand stderr are captured while in the second example, only stdout is\ncaptured.\n", "subsections": [] }, "SEE ALSO": { "content": "systemd(1), systemctl(1), logger(1)\n\nsystemd 249 SYSTEMD-CAT(1)", "subsections": [] } } } }