Shell Programming and Scripting

a=`wc -l bigfile.txt | awk '{print $1}'` ; awk -v len=$a 'BEGIN {print len / 2} NR >= (len / 2)  {print}' bigfile.txt

awk '/^Summary/,/*/' data

$ cat file
a nnnn sds
b ssss fdefd
c sdfd dsfd sdfds
Summary
t1 t2 t3 t4
s1 s2 s3 s4
f1 f2 f3 f4
$
$ a=`wc -l file | awk '{print $1}'` ; awk -v len=$a 'BEGIN {print len / 2} NR >= (len / 2)  {print}' file
awk: syntax error near line 1
awk: bailing out near line 1
$
$ awk '/^Summary/,/*/' file
awk: syntax error near line 1
awk: bailing out near line 1

$ sed -ne '/Summary/,$p' file
Summary
t1 t2 t3 t4
s1 s2 s3 s4
f1 f2 f3 f4

awk '/^Summary/,/\*/' data