Shell Programming and Scripting

# ls -1tr logs
log_hostX.Jan01_0100.gz
log_hostX.Jan01_0105.gz
log_hostX.Jan01_0110.gz
log_hostX.Jan01_0115.gz
log_hostX.Jan01_0120.gz
log_hostX.Jan01_0125.gz
log_hostX.Jan01_0130.gz
log_hostX

#!/usr/bin/ksh

# Prepare log dir
mkdir -p /tmp/logs
cd /tmp/logs

rm *.gz log_hostX

# Prepare some log files to play with
echo "log1 continue 01:00:00" > log_hostX.Jan01_0100
gzip log_hostX.Jan01_0100
sleep 1
echo "log2 continue 01:05:00 \nlog2 END 01:05:00" > log_hostX.Jan01_0105
gzip log_hostX.Jan01_0105
sleep 1
echo "log3 BEGIN 01:10:00\nlog3 continue 01:10:00" > log_hostX.Jan01_0110
gzip log_hostX.Jan01_0110
sleep 1
echo "log4 continue 01:15:00\nlog4 END 01:15:00" > log_hostX.Jan01_0115
gzip log_hostX.Jan01_0115
sleep 1
echo "log5 BEGIN 01:20:00\nlog5 continue 01:20:00" > log_hostX.Jan01_0120
gzip log_hostX.Jan01_0120
sleep 1
echo "log6 continue 01:25:00" > log_hostX.Jan01_0125
gzip log_hostX.Jan01_0125
sleep 1
echo "log7 continue 01:30:00" > log_hostX.Jan01_0130
gzip log_hostX.Jan01_0130
sleep 1
echo "log8 continue 01:35:00\nlog8 END 01:35:00" > log_hostX


### Actual code ###

# Set variables to default values
BEGIN_Mmm_DD="-----"
BEGIN_HH_MM_SS="--:--:--"
END_Mmm_DD="-----"
END_HH_MM_SS="--:--:--"

HOST=hostX
FILE=log_${HOST}

# Determine end time based on last file with END
if grep -i END ${FILE} > /dev/null
then
  END_HH_MM_SS=`grep -i END ${FILE} | awk '{print $3}'`
fi

# Determine begin and end MmmDD based on log file
BEGIN_Mmm_DD=`ls -als ${FILE} | awk '{printf "%s%0.2d", $7, $8}'`
END_Mmm_DD=$BEGIN_Mmm_DD

# Try to determine begin time based on last file with BEGIN
if grep BEGIN ${FILE} > /dev/null
then
  BEGIN_HH_MM_SS=`grep BEGIN ${FILE} | awk '{print $3}'`
fi

# BEGIN not found ?
# Try to determine the begin time in the previous trace file
if [[ $BEGIN_HH_MM_SS = "--:--:--" ]]
then
  # Determine filename
  FILE=`ls -1tr log_${HOST}.*.gz 2> /dev/null | awk '{X=$0} END {print X}'`
  if [ -n "$FILE" ]
    then
    # Determine date
    BEGIN_Mmm_DD=`ls -als ${FILE} | awk '{print $7 $8}'`
    # Determine begin time
    if gzcat ${FILE} | grep BEGIN > /dev/null
    then
     	BEGIN_HH_MM_SS=`gzcat ${FILE} | grep BEGIN | awk '{print $3}'`
    else
      BEGIN_Mmm_DD="-----"
      BEGIN_HH_MM_SS="--:--:--"
    fi
  fi
fi


# BEGIN still not found ?
# Try to determine the begin time in the previous previous trace file
if [[ $BEGIN_HH_MM_SS = "--:--:--" ]]
then
  # Determine filename
  FILE=`ls -1tr log_${HOST}.*.gz 2> /dev/null | awk '{y=x "\t" $0; x=$0}; END{print y}' | awk '{print $1}'`
  if [ -n "$FILE" ]                                                      
    then
    # Determine date
    BEGIN_Mmm_DD=`ls -als ${FILE} | awk '{print $7 $8}'`
    # Determine begin time
    if gzcat ${FILE} | grep BEGIN > /dev/null
    then
     	BEGIN_HH_MM_SS=`gzcat ${FILE} | grep BEGIN | awk '{print $3}'`
    else
      BEGIN_Mmm_DD="-----"
      BEGIN_HH_MM_SS="--:--:--"
    fi
  fi
fi

# What ? BEGIN still not found ?
# Try to determine the begin time in the previous previous previous trace file
if [[ $BEGIN_HH_MM_SS = "--:--:--" ]]
then
  # Determine filename
  FILE=`echo "THAT IS THE QUESTION !!"`
  FILE=log_hostX.Jan01_0120.gz
  if [ -n "$FILE" ]
    then
    # Determine date
    BEGIN_Mmm_DD=`ls -als ${FILE} | awk '{print $7 $8}'`
    # Determine begin time
    if gzcat ${FILE} | grep BEGIN > /dev/null
    then
     	BEGIN_HH_MM_SS=`gzcat ${FILE} | grep BEGIN | awk '{print $3}'`
    else
      BEGIN_Mmm_DD="-----"
      BEGIN_HH_MM_SS="--:--:--"
    fi
  fi
fi

# Print the header lines
printf "Host    Start             End\n"
printf "\n"

# Print the hostname
printf "%-8s" ${HOST}

# Print the results
printf "%-5s  %-8s   %-5s %-8s\n" ${BEGIN_Mmm_DD} ${BEGIN_HH_MM_SS} ${END_Mmm_DD} ${END_HH_MM_SS}

# ./LogStat.sh
Host    Start             End

hostX   Jan15  01:20:00   Jan15 01:35:00

BEGIN_Mmm_DD="-----"
BEGIN_HH_MM_SS="--:--:--"

HOST=hostX

cd /tmp/logs
LOG_LIST=`ls -1t log_${HOST}*`

for LOG_FILE in $LOG_LIST
  do
  
  # Determine the extension of the log file
  EXTENSION=$(echo ${LOG_FILE}|awk -F\. '{print $3}')
  EXTENSION=${EXTENSION:-none}
  if [ ! ${EXTENSION} == "gz" ]
  then
    # Try to determine begin date and time 
    if grep BEGIN ${LOG_FILE} > /dev/null
    then
      BEGIN_Mmm_DD=`ls -als ${LOG_FILE} | awk '{print $7 $8}'`
      BEGIN_HH_MM_SS=`grep BEGIN ${LOG_FILE} | awk '{print $3}'`
      break # we found the date and time, so we can leave the for loop
    fi
  else
    # Try to determine begin date and time
    if gzcat ${LOG_FILE} | grep BEGIN > /dev/null
    then
      BEGIN_Mmm_DD=`ls -als ${LOG_FILE} | awk '{print $7 $8}'`
      BEGIN_HH_MM_SS=`gzcat ${LOG_FILE} | grep BEGIN | awk '{print $3}'`
      break # we found the date and time, so we can leave the for loop
    fi
  fi

done