Shell Programming and Scripting

#!/bin/ksh
infile="Input"
outfile="Output"
ed -s "$infile" <<-EOF
        /Output view:/m0
        w $outfile
        q
EOF

$ awk '
BEGIN{
print "Output view:"
} NR==4 || /Output/ {next} {print $1}' file_name

Output view:
AAA
BBBB
CCCC
XXXX
YYYY
ZZZZ

ex -sc '/^Output view:/m0 | x' file

$ awk 'BEGIN{while(1){getline;if(/Output/){printf $0;break}x=x RS $0}print x}1'  file

$ awk '{if(/Output/)printf $0;else x=x RS $0}END{print x}' file

Output view:
AAA
BBBB
CCCC
XXXX
YYYY
ZZZZ

sed -e '/^Output view:/{G;p;}' -e '1{h;d;}' -e '2,/^Output view:/{H;d;}' file

sed '
/^Output view:/{G;p;}
1{h;d;}
2,/^Output view:/{H;d;}
' file

awk 'p; /^Output view:/ {print; print s; p=1} !p {s=s sep $0; sep=RS}' file

awk '           # invoke awk program and start script to be run by awk
/Output view:/ {# When an input line contains the string "Output view:"...
        f=1             # set f (found) to 1,
        $0=$0 p         # append the contents of p to the end of the
                        # current input line, and 
        p=x             # set p to the contents of x (an empty string) 
}       
!f {            # If f is 0...
        p=p RS $0       # append the record separator (default value is
                        # the newline character) and the current input
                        # line to p
}       
f               $ If f is not 0, print the current input line.
' file          # End awk script and specify the name of the input file.