1SYSTEMD-CAT(1) systemd-cat SYSTEMD-CAT(1)
2
6 systemd-cat - Connect a pipeline or program's output with the journal
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9 systemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...]
10 systemd-cat [OPTIONS...]
12
14 systemd-cat may be used to connect the standard input and output of a
15 process to the journal, or as a filter tool in a shell pipeline to pass
16 the output the previous pipeline element generates to the journal.
17 If no parameter is passed, systemd-cat will write everything it reads
19 from standard input (stdin) to the journal.
20 If parameters are passed, they are executed as command line with
22 standard output (stdout) and standard error output (stderr) connected
23 to the journal, so that all it writes is stored in the journal.
24
26 The following options are understood:
27 -h, --help
29 Print a short help text and exit.
30 --version
32 Print a short version string and exit.
33 -t, --identifier=
35 Specify a short string that is used to identify the logging tool.
36 If not specified, no identification string is written to the
37 journal.
38 -p, --priority=
40 Specify the default priority level for the logged messages. Pass
41 one of "emerg", "alert", "crit", "err", "warning", "notice",
42 "info", "debug", or a value between 0 and 7 (corresponding to the
43 same named levels). These priority values are the same as defined
44 by syslog(3). Defaults to "info". Note that this simply controls
45 the default, individual lines may be logged with different levels
46 if they are prefixed accordingly. For details, see --level-prefix=
47 below.
48 --stderr-priority=
50 Specifies the default priority level for messages from the
51 process's standard error output (stderr). Usage of this option is
52 the same as the --priority= option, above, and both can be used at
53 once. When both are used, --priority= will specify the default
54 priority for standard output (stdout).
55 If --stderr-priority= is not specified, messages from stderr will
57 still be logged, with the same default priority level as stdout.
58 Also, note that when stdout and stderr use the same default
60 priority, the messages will be strictly ordered, because one
61 channel is used for both. When the default priority differs, two
62 channels are used, and so stdout messages will not be strictly
63 ordered with respect to stderr messages - though they will tend to
64 be approximately ordered.
65 --level-prefix=
67 Controls whether lines read are parsed for syslog priority level
68 prefixes. If enabled (the default), a line prefixed with a priority
69 prefix such as "<5>" is logged at priority 5 ("notice"), and
70 similar for the other priority levels. Takes a boolean argument.
71
73 On success, 0 is returned, a non-zero failure code otherwise.
74
76 Example 1. Invoke a program
77 This calls /bin/ls with standard output and error connected to the
79 journal:
80 # systemd-cat ls
82 Example 2. Usage in a shell pipeline
84 This builds a shell pipeline also invoking /bin/ls and writes the
86 output it generates to the journal:
87 # ls | systemd-cat
89 Even though the two examples have very similar effects the first is
91 preferable since only one process is running at a time, and both stdout
92 and stderr are captured while in the second example, only stdout is
93 captured.
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96 systemd(1), systemctl(1), logger(1)
97systemd 250 SYSTEMD-CAT(1)