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Top Forums UNIX for Beginners Questions & Answers Copy last 30 minutes' contents from a log file Post 303040258 by stomp on Friday 25th of October 2019 03:22:42 PM
Old 10-25-2019
If you have logrotation in place you may want to know if a log-switch happened. I did this by checking if the first line of a file is still the same. (Hopefully it's not an empty line ;-) ) ... like this:

Code:
LOGFILE=/DB2/db2diag.log 
NEWFILE=${LOGFILE%.log}_$(date +%Y%m%d%H%M).log
CHKFILE=/var/scriptdata/db2diagline.dat
CHKFILE2=/var/scriptdata/db2firstline.dat
read FIRSTLINE_SAVED < $CHKFILE2
FIRSTLINE="$(head -n1 $LOGFILE)"

if [ "$FIRSTLINE" == "$FIRSTLINE_SAVED" ] ; then 
   EndLine=$(awk 'END{print NR}' $LOGFILE)
   if [ -f $CHKFILE ] ; then
       read StartLine < $CHFILE
       StartLine=${StartLine:-0}
       # Test for log file truncated
       [ $EndLine -lt $StartLine ] && StartLine=0
   else
      StartLine=0
   fi
else
   StartLine=0
   head -n1 $LOGFILE > $CHKFILE2
fi


awk -vS=$StartLine -vE=$EndLine 'NR>E{exit} NR>S' $LOGFILE > $NEWFILE

#Save EndLine for StartLine next time
echo "$EndLine" > $CHKFILE


Last edited by stomp; 10-25-2019 at 04:35 PM..
 

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set_color(1)							       fish							      set_color(1)

NAME
set_color - set_color - set the terminal color set_color - set the terminal color Synopsis set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR] Description Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple, cyan, white and normal. o -b, --background Set the background color o -c, --print-colors Prints a list of all valid color names o -h, --help Display help message and exit o -o, --bold Set bold or extra bright mode o -u, --underline Set underlined mode o -v, --version Display version and exit Calling set_color normal will set the terminal color to whatever is the default color of the terminal. Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey font color, while set_color --bold white will result in a white font color. Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator. set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of ncurses and recompile fish against it in order to fix this issue. Version 1.23.1 Sun Jan 8 2012 set_color(1)
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