Mini Shell

#!/usr/bin/sh
# /usr/lib64/sa/sa1
# (C) 1999-2021 Sebastien Godard (sysstat <at> orange.fr)
#
#@(#) sysstat-12.5.4
#@(#) sa1: Collect and store binary data in system activity data file.
#

# Set default value for some variables.
# Used only if ${SYSCONFIG_DIR}/${SYSCONFIG_FILE} doesn't exist!
HISTORY=0
SADC_OPTIONS=""
SA_DIR=/var/log/sa
SYSCONFIG_DIR=/etc/sysconfig
SYSCONFIG_FILE=sysstat
UMASK=0022
LONG_NAME=n

[ -r ${SYSCONFIG_DIR}/${SYSCONFIG_FILE} ] && . ${SYSCONFIG_DIR}/${SYSCONFIG_FILE}

umask ${UMASK}

# If the user-supplied value for SA_DIR in sysconfig file is not a directory
# then fall back on default directory. Create this default directory if it doesn't exist.
[ -d ${SA_DIR} ] || SA_DIR=/var/log/sa
[ -d /var/log/sa ] || mkdir /var/log/sa

if [ ${HISTORY} -gt 28 ]
then
	SADC_OPTIONS="${SADC_OPTIONS} -D"
	LONG_NAME=y
fi

ENDIR=/usr/lib64/sa
cd ${ENDIR}
[ "$1" = "--boot" ] && shift && BOOT=y || BOOT=n
[ "$1" = "--sleep" ] && shift && SLEEP=y || SLEEP=n

ROTATE=n
[ "$1" = "--rotate" ] && shift && ROTATE=y && [ "$1" = "iso" ] && shift && LONG_NAME=y
if [ "${ROTATE}" = "y" ]
then
	if [ "${LONG_NAME}" = "y" ]
	then
		DATE=`date --date=yesterday +%Y%m%d`
	else
		DATE=`date --date=yesterday +%d`
	fi
	SA_DIR=${SA_DIR}/sa${DATE}
fi

if [ "${SLEEP}" = "y" ]
then
	exec ${ENDIR}/sadc -F -L ${SADC_OPTIONS} -C "LINUX SLEEP MODE ($*)" ${SA_DIR}
elif [ $# = 0 ] && [ "${BOOT}" = "n" ]
then
# Note: Stats are written at the end of previous file *and* at the
# beginning of the new one (when there is a file rotation) only if
# outfile has not been explicitly specified on the command line...
	exec ${ENDIR}/sadc -F -L ${SADC_OPTIONS} 1 1 ${SA_DIR}
else
	exec ${ENDIR}/sadc -F -L ${SADC_OPTIONS} $* ${SA_DIR}
fi