Posted By

bubnoff on 08/05/10


Bash awk

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Merge lines with Awk

 / Published in: Awk

For use in bash script. First two lines are an example of usage. This is one of several solutions to this problem. Works well for cleaning database output. Takes a regex and two files as arguments - first one is raw db output - second is merged output.This assumes unwanted line breaks. You can also get the same results working with the newline characters -- will post that one as well. The --re-interval option is only necessary if you want to enable regex interval operators like {n} or {n,m} ....etc. If using a current version of GNU Awk, might as well leave it in there.

  1. REGEX="/^[^|]/"
  2. func_merge_lines "$REGEX" $TMP1 $TMP2
  4. function func_merge_lines
  5. {
  6. awk --re-interval "NR==1 \
  7. { s=\$0;next } \
  8. "$1"{ s=s\$0;next } \
  9. { print s;s=\$0 } END {if(s)print s}" $2 > $3 # merge lines.
  10. # Looks for lines not starting with pipe
  11. # then merges line below to end.
  12. }

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