Combine multiple lines in single line


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# 1  
Combine multiple lines in single line

This is related to one of my previous post but now with a slight difference: I need the "Updated:" to be in one line as well as the "Information:" on one line as well. These are in multiple lines right now as seen below. These can have 2 or more lines that needs to be in one line.

Code:
System name: xxx_yyy
Information: this is just a sample
file for this testing
today
Updated: This is not
updated
System name: testing_123
Information: another testing
Updated: No new update for this 
system name.
System name: abc_12333
Information: another testing again
and again
Updated: This has been updated
with new information

There are hundred lines with the above pattern.

Result:
Code:
System name: xxx_yyy
Information: this is just a sample file for this testing today
Updated: This is not updated
System name: testing_123
Information: another testing again
Updated: No new update for this system name.
System name: abc_12333
Information: another testing again and again
Updated: This has been updated with new information

# 2  
Code:
sed '
  :loop
  $b
  N
  /: .*\n.*: /{
    P
    s/.*\n//
    b loop
   }
  s/ *\n */ /
  b loop
 '

Narrative: This is what I call a sed looper, reading it's own lies after the first rather than exiting the script at the end to get the next line:
  1. declare a branch target 'loop',
  2. if last line, print and exit,
  3. If the two lines in the buffer each have ': ', print out the first line and go back to 'loop' to get another line.
  4. Remove the linefeed and any adjacent spaces in favor of a single space.
  5. Go back to 'loop' to get another line.
# 3  
Or with awk...

nawk -F : -f my.awk my.txt

my.awk
Code:
BEGIN {
        line=""
}

{

        if ( $1 == "System name" ||  $1 == "Information" ||  $1 == "Updated" ) {
                if ( length(line) > 0 ) { print line }
                line = $0
        } else {
                line = sprintf("%s %s", line, $0)
        }

}

END {
        print line
}

# 4  
Code:
awk '/: /{if(NR>1)print p;p=$0;next}{p=p FS $0}END{print p}' infile


Last edited by Scrutinizer; 10-26-2010 at 01:27 PM.. Reason: Removed ^[^:]* since it provided no added security
# 5  
Quote:
Originally Posted by DGPickett
Code:
sed '
  :loop
  $b
  N
  /: .*\n.*: /{
    P
    s/.*\n//
    b loop
   }
  s/ *\n */ /
  b loop
 '

Narrative: This is what I call a sed looper, reading it's own lies after the first rather than exiting the script at the end to get the next line:
  1. declare a branch target 'loop',
  2. if last line, print and exit,
  3. If the two lines in the buffer each have ': ', print out the first line and go back to 'loop' to get another line.
  4. Remove the linefeed and any adjacent spaces in favor of a single space.
  5. Go back to 'loop' to get another line.
you really are a genius! I wanted to learn more in this as im using this kind of text editing frequently. Do you know any reference on this kind of sed function where i can learn more?
# 6  
Code:
sed -n '/:/{x;1!s/\n/ /g;1!p;d;};H;${g;s/\n/ /g;p;}' infile

# 7  
Code:
echo `sed 's/^\(.*\):/|\1:/' input | tr -d '\n'` | sed 's/^|//' | tr '|' \\n

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