#exec, #piktexec, #pexec
#include "/dev/null" [<proc>]Or, you can use its effective equivalent
#exec "/dev/null" [<proc>]Because you have specified a file (/dev/null), [<proc>] will only be run if you are doing a 'piktc -I' (update #include/#verbatim files) operation.
If you want to run [<proc>] every time (whether or not you are using the piktc -I option), you would use
#exec [<proc>]One possible use of #exec would be to run some external process that updates a series of #include files referenced later on in the PIKT configuration.
sudo members #verbatim <systems/sudo_systems.cfg> [/pikt/bin/piktc -xI +C "=ls /etc/sudoers 2>/dev/null | =grep sudoers >/dev/null && =hostname" -H down 2>/dev/null] #piktexec "/dev/null" [if =wednesday =mailmsg1(review the sudo group, REMINDER, =piktadmin) fi]The above says to populate the sudo host group with machines identified as sudo machines by the presence of an /etc/sudoers file. Then, in the #piktexec directive, if today is Wednesday, e-mail a short reminder message, "review the sudo group," to the PIKT sysadmin. Because of the "/dev/null", this reminder is only sent (on Wednesdays) during any 'piktc -I' program run.
Note that you may use PIKT macros (for example, =mailmsg1()) in your #piktexec [<proc>].
#pexec "/dev/null" [=remind(2001, 6, 30, reactivate the Foo alarm, REMINDER, =piktadmin)]If you left out the "/dev/null", and if this were June 30, 2001, the reminder message would be sent and resent with every piktc run that day, which is probably not what you want.
#exec and #piktexec were inspired by the felt need to deal with the general reminder problem. You have this capability, in alarms.cfg, by means of something like the =remind() macro. #piktexec extends this sort of capability to all the other PIKT .cfg files.
It will be interesting to discover other uses for #exec, #piktexec, and the whole idea of running processes from within the PIKT configuration.
Using #exec and #piktexec correctly requires subtlety and care on your part, especially when it comes to proper quoting. A good rule of thumb: Avoid using single quotes (') anywhere within a #piktexec directive.
Refer to the Samples section for examples.
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