On 13/08/15 08:52, Christopher Ross wrote:
On 13/08/15 01:42, Ed Greshko wrote:
On 08/13/15 08:01, Ed Greshko wrote:
Being that it was a very specific question the 2 words were easy to
divine.
And, if I had my coffee, I probably would have used "-K" and a single
word before resorting to google. Recalling, again, this to have been
a very specific question with a very unique word.
I salute your google-fu! It is not at all obvious to me. The Question is
what is the EnviromentFile and what does "=-" mean within it...
root@snoopy 08:46:58 ~ # apropos "=-"
=-: nothing appropriate.
root@snoopy 08:47:06 ~ # apropos "EnvironmentFile"
EnvironmentFile: nothing appropriate.
root@snoopy 08:50:12 ~ # apropos systemd | wc -l
155
Continuing that search then...
root@snoopy 08:50:25 ~ # apropos systemd | grep environment
systemd-detect-virt (1) - Detect execution in a virtualized environment
systemd.exec (5) - Execution environment configuration
root@snoopy 08:53:31 ~ # man systemd.exec
...
EnvironmentFile=
Similar to Environment= but reads the environment variables
from a text file. The text file should contain
new-line-separated variable assignments. Empty lines and
lines starting with ; or # will be ignored, which may be
used for commenting. A line ending with a backslash will be
concatenated with the following one, allowing multiline
variable definitions. The parser strips leading and trailing
whitespace from the values of assignments, unless you
use double quotes (").
So that's part of the question answered. The above manpage also says
"See environ(7) for details about environment variables."
root@snoopy 09:07:33 ~ # man 7 environ
Unfortunately that man page makes no reference to "=-" or similar
root@snoopy 09:13:06 ~ # man bash
Neither does the bash manpage. So if your glib statement "The answer you
seek is in the man pages." is true I cannot find it.
My guess is that the OP example
/usr/lib/systemd/system/irda.service:EnvironmentFile=-/etc/sysconfig/irda
/usr/lib/systemd/system/sshd.service:EnvironmentFile=/etc/sysconfig/sshd
In effect means "don't use that, use this" but I haven't confirmed that
from the man page.
Regards,
Chris R.
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