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Hi rdcwayx,
your comments is correct, that's the limitation of my script, it's not robust enough, your code is much better.
Aagin, thanks for your correction.

Thanks for your reply:b:
I have modified the code

#! /bin/awk
{NR>1
{
if($1-var1==1)
{var2=$1}
else
{while (var2<$1-1)
print ++var2":00"}
var2=$1}
{if(/^[0-9]/)
var1=$1}
}1

try:
#! /bin/awk
{
NR>1
{
if($1-var1==1)
{
var2=$1
}
else
{while (var2<$1-1)
print ++var2":00"}
}
{if(/^[0-9]/)
var1=$1}
}1

if you want keep the headers in the file just make a little change replacing the old code {var1=$1} replaced by this code
/^[0-9]/{var1=$1}

try this way:


#! /bin/awk
{

NR>1
{
if($1-var1==1)
{
var2=$1
}
else
{while (var2<$1)
print ++var2":00"}
}
{var1=$1}
}1

how about this?
echo '0:00 Clear weather 29
1:00 Clear weather 28
2:00 Clear weather 27
6:00 Clear weather 25
8:00 Clear weather 29
9:00 Clear weather 29
10:00 Clear weather 32
11:00 Clear...