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Operating Systems Linux Red Hat Difference between 'init s' and 'init 1' Post 302389166 by fpmurphy on Saturday 23rd of January 2010 03:30:10 AM
Old 01-23-2010
Booting to runlevel 1 causes RHEL to process the /etc/rc.d/rc.sysinit script followed a single script from rc1.d which after some basic checks and cleanup execs init S.

Booting to runlevel s (S or single) causes RHEL to just process the /etc/rc.d/rc.sysinit script. If /etc/inittab is missing or corrupt, you go directly to a root shell with no scripts processed.
 

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init-checkconf(8)					      System Manager's Manual						 init-checkconf(8)

NAME
init-checkconf - manual page for init-checkconf SYNOPSIS
init-checkconf [OPTIONS] file init-checkconf [OPTIONS] -f file DESCRIPTION
Determine if specified Upstart init(8) job configuration file is valid. By default, two checks are performed: o Ensure Upstart can parse overall file successfully o Ensure all script sections are parseable by shell OPTIONS
-d , --debug Show some debug output. -f file , --file=file Specify job configuration file to check. -i path , --initctl-path=path Specify path to initctl(8) binary. -s , --noscript Do not check script sections. -x path , --upstart-path=path Specify path to init(8) binary. -h , --help Display usage statement. AUTHOR
Written by James Hunt <james.hunt@ubuntu.com> LIMITATIONS
o This program will not run as the root user. o It is not possible for a user to run multiple simultaneous instances of this program. REPORTING BUGS
Report bugs at <https://launchpad.net/upstart/+bugs> COPYRIGHT
Copyright (C) 2011 Canonical Ltd. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
sh(1) init(5) init(8) Upstart 2011-04-06 init-checkconf(8)
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