Merge Lines

Shell Programming and Scripting
1

Hello
I have an input as below

[2014-03-03t23:15:45] this is test
[2013-14-20t12:23:12]we
are(
)
[
]
one
[2012-03-03t23:15:45] end of description

I am looking for output

[2014-03-03t23:15:45] this is test
[2013-14-20t12:23:12]we are ()[] one
[2012-03-03t23:15:45] end of description
2

To get output like that, you're going to have to provide a detailed description describing when spaces are to be added to text in an existing line, and when spaces are to be added before or after text when lines are joined.

What have you tried?

3 
awk 'NR == 1 {p = $0; next}
  {if($0 ~ /^\[[12][0-9][0-9][0-9]-.+\]/) {print p; p = $0}
  else {p = (p $0)}}
  END {print p}' file

Output:

[2014-03-03t23:15:45] this is test
[2013-14-20t12:23:12]weare()[]one
[2012-03-03t23:15:45] end of description

awk 'NR == 1 {p = $0; next}
  {if($0 ~ /^\[[12][0-9][0-9][0-9]-.+\]/) {print p; p = $0}
  else {p = (p " " $0)}}
  END {print p}' file

Output:

[2014-03-03t23:15:45] this is test
[2013-14-20t12:23:12]we are( ) [ ] one
[2012-03-03t23:15:45] end of description