man:systemd.service ExecStart=@ prefix

serafean · 03-17-2017, 04:09 PM

Hi,

I'm reading the systemd.service man page, and can't figure out what this part of the ExecStart description means :

Quote:

For each of the specified commands, the first argument must be an absolute path to an executable. Optionally, if this file name is prefixed with "@", the second token will be passed as "argv[0]" to the executed process, followed by the further arguments specified.

And even less how to use it.

Any ideas?

Thanks.

ondoho · 03-17-2017, 05:04 PM

i think argv[0] is the same as $0 on a shell; it is the name of the program being executed.
so you could tell the program defined by execstart that it runs under a different name?
i know this can be useful at times.

serafean · 03-19-2017, 05:52 AM

Thanks! I was confused about changing only the name part.
Could you please give an example of when it could be useful? I can't come up with any.

Thanks.

ondoho · 03-19-2017, 06:01 AM

here you are:

Quote:

Originally Posted by man rofi

DMENU REPLACEMENT
If argv[0] (calling command) is dmenu, rofi will start in dmenu mode. This way it can be
used as a drop-in replacement for dmenu. just copy or symlink rofi to dmenu in $PATH.

ln -s /usr/bin/rofi /usr/bin/dmenu