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Full Discussion: concatenate lines using shell scripting
Top Forums Shell Programming and Scripting concatenate lines using shell scripting Post 302351017 by durden_tyler on Monday 7th of September 2009 12:00:01 AM
Old 09-07-2009
Quote:
Originally Posted by dtdt
i have a mega file in this format:

a,
b,
c,
d,
=
a2,
b2,
c2,
d2,
=
a3,
b3
=

i want to combine lines until = meet. the result should be :
a,b,c,d,
a2,b2,c3,d2
a3,b3
...
One way to do it in Perl:

Code:
$ 
$ cat f2
a,
b,
c,
d,
=
a2,
b2,
c2,
d2,
=
a3,
b3
=
$ 
$ perl -ne 'chomp; $x.=$_; END{$x=~s/[,]*=/\n/g; print $x}' f2
a,b,c,d
a2,b2,c2,d2
a3,b3
$ 
$

If you use vi or vim to open your file in Unix/Linux and see "^M" characters at the end of each line, then that could be one of your problems.

tyler_durden
 

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LEARN ABOUT FREEBSD

lessecho

LESSECHO(1)						      General Commands Manual						       LESSECHO(1)

NAME

       lessecho - expand metacharacters

SYNOPSIS

       lessecho [-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-a] file ...

DESCRIPTION

       lessecho  is  a program that simply echos its arguments on standard output.  But any metacharacter in the output is preceded by an "escape"
       character, which by default is a backslash.

OPTIONS

       A summary of options is included below.

       -ex    Specifies "x", rather than backslash, to be the escape char for metachars.  If x is "-", no escape char is used and  arguments  con-
	      taining metachars are surrounded by quotes instead.

       -ox    Specifies "x", rather than double-quote, to be the open quote character, which is used if the -e- option is specified.

       -cx    Specifies "x" to be the close quote character.

       -pn    Specifies "n" to be the open quote character, as an integer.

       -dn    Specifies "n" to be the close quote character, as an integer.

       -mx    Specifies "x" to be a metachar.  By default, no characters are considered metachars.

       -nn    Specifies "n" to be a metachar, as an integer.

       -fn    Specifies "n" to be the escape char for metachars, as an integer.

       -a     Specifies that all arguments are to be quoted.  The default is that only arguments containing metacharacters are quoted

SEE ALSO

       less(1)

AUTHOR

       This manual page was written by Thomas Schoepf <schoepf@debian.org>, for the Debian GNU/Linux system (but may be used by others).

       Send bug reports or comments to bug-less@gnu.org.

							     Version 458: 04 Apr 2013						       LESSECHO(1)
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