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Linux Boot process – http://www.ibm.com/developerworks/library/l-linuxboot/

https://doc.lagout.org/LPI/

http://www.ibm.com/developerworks/library/l-boot-rootfs/

https://www.ibm.com/developerworks/linux/lpi/

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exim – Suggested action: use keep_environment.

 

 
rmdcasws2:~ #  exim4 -bP | grep environment
LOG: MAIN
Warning: purging the environment.
Suggested action: use keep_environment.
add_environment =
keep_environment =

rmdcasws2:~ # dpkg-reconfigure exim4-config
[ ok ] Stopping MTA for restart: exim4_listener.
[ ok ] Restarting MTA: exim4.

rmdcasws2:/etc/exim4 # tail -n 12 conf.d/main/02_exim4-config_options

.ifdef MAIN_KEEP_ENVIRONMENT
keep_environment = MAIN_KEEP_ENVIRONMENT
.endif
.ifdef MAIN_ADD_ENVIRONMENT
add_environment = MAIN_ADD_ENVIRONMENT
.elifndef MAIN_KEEP_ENVIRONMENT
# set empty add_environment to avoid warning.
add_environment = <; PATH=/bin:/usr/bin
keep_environment =
.endif

rmdcasws2:/etc/exim4 # update-exim4.conf
rmdcasws2:/etc/exim4 # exim4 -bP | grep environment
add_environment = <; PATH=/bin:/usr/bin
keep_environment =