Shell Programming and Scripting

awk 'FNR==NR{ array[++c]=$0;next }
     /Pattern/ { 
		for( i=FNR-7;i<FNR;i++){
		   print array[i]
		}
		for(i=FNR+1;i<=FNR+3;i++) {
		   print array[i]
		}
	 }
' "file" "file"

awk '
BEGIN {i=1}
{
vec[i]=$0
i++
if ( $0 ~ /failed/ ) {
          for (j=i-4;j<i;j++)
             print vec[j]
          for (j=1;j<=2;j++)
             {
             getline
             print
             }
          i=1
          }
}' logcopy

typeset -i mLineNbr
typeset -i mMinus7
typeset -i mPlus3
typeset -i mTotRecs
mTotRecs=`wc -l < input_file`
egrep -n 'PATTERN' input_file | \
while read mLine
do
  mLineNbr=`echo $mLine | cut -d':' -f1`
  mMinus7=$mLineNbr-7
  if [ ${mMinus7} -le 0 ]; then
    mMinus7=1
  fi
  mPlus3=${mLineNbr}+3
  if [ ${mPlus3} -gt ${mTotRecs} ]; then
    mPlus3=${mTotRecs}
  fi
  sed -n "${mMinus7},${mPlus3}p" input_file
done