This option was added with util-linux v2.25 in 2014. If you're using an older version or the Busybox `logger` instead, well, it won't have that.
The alternative is to write your own C tool that uses libsystemd and calls sd_journal_send <https://manpages.debian.org/testing/libsystemd-dev/sd_journal_send.3.en.html>() with the correct fields (libsystemd is definitely going to be present), or a Python tool that uses systemd.journal.send(). (Or maybe call libsystemd through python ctypes or whatever other FFI mechanism is available.) On Fri, Oct 22, 2021 at 4:32 PM DHAIY DHAIY <dh...@msn.com> wrote: > Thanks a lot Mantas. > But in my sytem, logger does not have "--journal". > Are you aware of other tools from bash which can be used? > > BR > ------------------------------ > *发件人:* Mantas Mikulėnas <graw...@gmail.com> > *发送时间:* 2021年10月22日 18:45 > *收件人:* DHAIY DHAIY <dh...@msn.com> > *抄送:* systemd-devel@lists.freedesktop.org < > systemd-devel@lists.freedesktop.org> > *主题:* Re: [systemd-devel] 回复: Is it possible to send a string to the > journal of one specific systemd unit > > If you have root privileges (i.e. UID 0), then yes, you can send a journal > message with the "OBJECT_SYSTEMD_UNIT=myservice.service" field and > journalctl will automatically look for that. > > In C, specify the field when calling sd_journal_sendv(); in bash you can > use `logger --journal`: > > (echo "OBJECT_SYSTEMD_UNIT=sshd.service"; > echo "MESSAGE=Hello world!") | sudo logger --journal > > On Fri, Oct 22, 2021 at 11:43 AM DHAIY DHAIY <dh...@msn.com> wrote: > > Saying we have a systemd unit named "myservice". > > we can use *journalctl -u myservice* to inspect the logs generated by > myservice. > > > But is there a way to insert one string from command-line into myservice's > journal so that it can be seen by *journalctl -u myservice* later? > > ------------------------------ > *发件人:* DHAIY DHAIY > *发送时间:* 2021年10月22日 16:40 > *收件人:* systemd-devel@lists.freedesktop.org < > systemd-devel@lists.freedesktop.org> > *主题:* Is it possible to send a string to the journal of one specific > systemd unit > > > Saying we have a systemd unit named "myservice". > > we can use *journalctl -u myservice* to inspect the logs generated by > myservice. > > > But is there a way to insert one string from command-line into myservice's > journal so that it can be seen by *journalctl -u myservice* later? > > > > -- > Mantas Mikulėnas > -- Mantas Mikulėnas