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Top Forums Shell Programming and Scripting remove blank lines and merge lines in shell Post 302502638 by dvah on Tuesday 8th of March 2011 01:22:37 PM
Old 03-08-2011
MySQL

Quote:
Originally Posted by Corona688
How about this:
Code:
awk  'BEGIN { RS="" ; FS="\n" ; OFS="," } { print $1, $2 }' < csvrec.csv > out.csv

That works by
  • Splitting records based on blank lines (RS="")
  • Using the newline as the field separator, so $1 is line 1 and $2 is line 2
  • Using "," as the output field separator, so it adds an "," between the two when you print a,b
---------- Post updated at 12:16 PM ---------- Previous update was at 12:07 PM ----------

If you need an extra "," on the end you can just do print $1, $2, ""
It works partially good.

1. i've to implement this shell for hundreds of csv's, so i'm not quite sure on the number of lines for each record in these files. so print $1, $2 works well for two lines of record followed by a blank line. But this has to be dynamic.

2. It doesn't seem to add a extra delimiter to the end of each record, i.e before each blank line

Thanks!
 

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CUT(1)                                                             User Commands                                                            CUT(1)

NAME
cut - remove sections from each line of files SYNOPSIS
cut OPTION... [FILE]... DESCRIPTION
Print selected parts of lines from each FILE to standard output. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --bytes=LIST select only these bytes -c, --characters=LIST select only these characters -d, --delimiter=DELIM use DELIM instead of TAB for field delimiter -f, --fields=LIST select only these fields; also print any line that contains no delimiter character, unless the -s option is specified -n (ignored) --complement complement the set of selected bytes, characters or fields -s, --only-delimited do not print lines not containing delimiters --output-delimiter=STRING use STRING as the output delimiter the default is to use the input delimiter -z, --zero-terminated line delimiter is NUL, not newline --help display this help and exit --version output version information and exit Use one, and only one of -b, -c or -f. Each LIST is made up of one range, or many ranges separated by commas. Selected input is written in the same order that it is read, and is written exactly once. Each range is one of: N N'th byte, character or field, counted from 1 N- from N'th byte, character or field, to end of line N-M from N'th to M'th (included) byte, character or field -M from first to M'th (included) byte, character or field AUTHOR
Written by David M. Ihnat, David MacKenzie, and Jim Meyering. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report cut translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/cut> or available locally via: info '(coreutils) cut invocation' GNU coreutils 8.28 January 2018 CUT(1)
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