Shell Programming and Scripting

cat 1.txt
a <abc
b vfff
c 000>
d 4444

<abcvfff000>

awk '/<abc/,/>/ {printf $2}' 1.txt|awk 'gsub(/></,">\n<")'

awk ' BEGIN { f=0 } { \
	if($2 ~ /<[^>]*$/) { s=substr($2, index($2, "<")); f=1 } \
	else if ($2 ~ /<.+>/) { if (f==0) { i1=index($2,"<"); i2=index($2,">"); print substr($2, i1, i2-i1+1) } else { print s substr($2,1,index($2,">")); f=0} } \
	else if (f==1 && $2 ~ />/) { print s substr($2,1,index($2, ">")); f=0 } \
	else { s=s $2 }	\
} ' inputfile