Merge lines

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# 1  
Old 03-12-2013
Merge lines

I have a file with
 CAR 23
CAR 44
CAR 55
CAR 56
CAR 57

How can merge the CAR and the COLOR + SIZE (if there are COLOR,SIZE)
CAR 56 

Every line begin in CAR

Last edited by Corona688; 03-12-2013 at 01:54 PM..
# 2  
Old 03-12-2013
awk '/CAR/ && C { print C ; C=$0 ; next } { C=C" "$0; } END { if(C) print C }' inputfile

# 3  
Old 03-12-2013
 cat inputfile | tr '\n' ' '  | sed 's/ CAR /\nCAR /g; s/ $/\n/'

# 4  
Old 03-12-2013
sed '
  s/^  *//
  t loop
  s/ *\n *CAR /\
  t p
  s/ *\n */ /
  t loop
  t loop
 ' in_file >out_file

Narrative: Clean leading spaces off the first line, branch to the target to clear the branch flag, create a loop back branch target, exit at EOF printing last line, get a second line into the buffer, if it is a CAR line just clean it up and branch to print first line, remove first line, and loop. If not a CAR line, turn the linefeed and any adjacent spaces into a space and loop. I call this a classic looper in sed, where you merge lines but have to deal with the next group or EOF. Note that a) it assumed the first line is a CAR line, and B) it checks for 'CAR ', not just 'CAR', so as not to be fooled by substrings of other words.
# 5  
Old 03-12-2013
awk ' {
        $1 = $1
        A[++n] = $0
} END {
        for ( i = 1; i <= n; i++ ) {
                if ( A[i] ~ /CAR/ ) {
                        A[i] = ( i == 1 ? A[i] FS : RS A[i] FS )
                        printf A[i]
                        A[i] = ( i == n ? A[i] RS : A[i] FS )
                        printf A[i]
}' filename

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