Customizing /etc/rc

The /etc/rc file contains customization commands for z/OS UNIX System Services Application Services. Copy the IBM®-supplied /samples/rc file to /etc/rc, as described in Steps for customizing /etc/rc and customize it.

If the /etc/inittab file is installed, z/OS® UNIX installation processes the /etc/inittab file instead of executing the /etc/rc file. If you want to use /etc/inittab in addition to the existing /etc/rc file, then include an entry in the /etc/inittab file to start /etc/rc.

The following excerpt of IBM-supplied /samples/rc file includes the set -v -x command, which specifies that a verbose shell command trace of /etc/rc is to be written to /etc/log. Certain comments are also commented out.

# Initial setup for z/OS UNIX
export _BPX_JOBNAME='ETCRC'

# Provide z/OS UNIX Startup Diagnostics
set -v -x

# Setup utmpx file
>/etc/utmpx
chmod 644 /etc/utmpx

# Reset all slave tty files
chmod 666 /dev/tty*
chown 0 /dev/tty*

# Allow only file owner to remove files from /tmp
chmod 1777 /tmp

# Allow only file owner to remove files from /var
chmod 1777 /var

# Allow only file owner to remove files from /dev
chmod 1755 /dev


# Setup write, talk, mesg utilities
# chgrp TTY   /bin/write
# chgrp TTY   /bin/mesg
# chgrp TTY   /bin/talk
# chmod 2755  /bin/write
# chmod 2755  /bin/mesg
# chmod 2755  /bin/talk
# Performed at install in HOT7707
# Commented out in HOT6609 and performed in SAMPLIB job FOMISCHO


# Setup mailx utility
# No need to CHGRP /usr/mail directory
# No need to CHGRP mailx utility
# No need to CHMOD mailx to turn on SETGID

# Setup uucp utility
# chown uucp:uucpg /usr/lib/uucp
# chown uucp:uucpg /usr/lib/uucp/IBM
# chown uucp:uucpg /usr/spool/uucp
# chown uucp:uucpg /usr/spool/locks
# chown uucp:uucpg /usr/spool/uucppublic
# chown uucp:uucpg /usr/spool/uucp/.Xqtdir
# chown uucp:uucpg /usr/spool/uucp/.Sequence
# chown uucp:uucpg /usr/spool/uucp/.Status
# chown uucp:uucpg /bin/uucp
# chown uucp:uucpg /bin/uuname
# chown uucp:uucpg /bin/uustat
# chown uucp:uucpg /bin/uux
# chown uucp:uucpg /usr/lib/uucp/uucico
# chown uucp:uucpg /usr/lib/uucp/uuxqt
# chown uucp:uucpg /usr/lib/uucp/uucc
# chmod 4775 /bin/uucp
# chmod 4775 /bin/uuname
# chmod 4775 /bin/uustat
# chmod 4775 /bin/uux
# chmod 4754 /usr/lib/uucp/uucico
# chmod 4754 /usr/lib/uucp/uuxqt
# chmod 4774 /usr/lib/uucp/uucc
# Performed at install in HOT7707
# Commented out in HOT6609 and performed in SAMPLIB job FOMISCHO

# Invoke vi recovery
#

# mkdir -m 777 /var/tmp
# export TMP_VI="/var/tmp"
if [ -e /etc/recover ]
then
    chmod 1777 /etc/recover
else
    mkdir -m 1777 /etc/recover
fi  
/usr/lib/exrecover

# Create TERMINFO database
# tic /usr/share/lib/terminfo/ibm.ti
# tic /usr/share/lib/terminfo/dec.ti
# tic /usr/share/lib/terminfo/wyse.ti
# tic /usr/share/lib/terminfo/dtterm.ti
# commented tic out in HOT1180 - all TERMINFO files are shipped

#----------------------------------------------------------
# Added in HOT7750 to eliminate a manual migration action.
#
# Remove all files in the man cache that were created by the
 man command for the default MANPATH directory.
#
# NOTE: This loop only removes files for a subset of the LANG values 
#   possible.  Administrators should customize the loop to include 
#   the LANG values supported on their system.
#----------------------------------------------------------
for MAN_CACHE_LANG in C Ja_JP Zh_CN ; do
  [[ -d /var/man/$MAN_CACHE_LANG ]] && rm /var/man/$MAN_CACHE_LANG/*.[0-9].*
done

# Start the INET daemon for remote login activity
#_BPX_JOBNAME='INETD' /usr/sbin/inetd /etc/inetd.conf &

sleep 5
echo /etc/rc script executed, `date`

The following setup sections have been commented out:

For the mailx utility because the mailx utility no longer requires these entries.
For creating the terminfo database because IBM ships the individual files that make up the terminfo database.
For the mesg, talk, write and uucp because this customization is now done when running the FOMISCHO sample job.