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Shell Programming and Scripting

joining 2 lines into single one

 
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Old 10-16-2008
joining 2 lines into single one
i have a script that joins 2 lines of a file into one line and again next 2 line into one line.

if number of line is 4 then after joining it should be 2 lines in a file

my file a1.txt has some of the below lines

1-GH32X, CC, AMR,
Number of Intervals Not Inserted: 1 / 95
1-150KP1, CC, AMR,
Number of Intervals Not Inserted: 1 / 96
1-VWEMR, CC, AMR,
Number of Intervals Not Inserted: 1 / 98
1-15HM1A, CC, AMR,
Number of Intervals Not Inserted: 1 / 99
1-153PIV, CC, AMR,
Number of Intervals Not Inserted: 3 / 99
------------------------------------------------------------------------
desired o/p should be :

1-GH32X, CC, AMR,Number of Intervals Not Inserted: 1 / 95
1-150KP1, CC, AMR,Number of Intervals Not Inserted: 1 / 96
1-VWEMR, CC, AMR,Number of Intervals Not Inserted: 1 / 98
1-15HM1A, CC, AMR,Number of Intervals Not Inserted: 1 / 99
1-153PIV, CC, AMR,Number of Intervals Not Inserted: 3 / 99

i m using the below command but it's not joining properly

paste -s -d" \n" a1.txt >> a2.txt

-----------------------------------------------------------

plz help me in this?
 
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LEARN ABOUT OPENDARWIN

fmt

FMT(1)							    BSD General Commands Manual 						    FMT(1)

NAME

     fmt -- simple text formatter

SYNOPSIS

     fmt [-cmnps] [-d chars] [-l num] [-t num] [goal [maximum] | -width | -w width] [file ...]

DESCRIPTION

     The fmt utility is a simple text formatter which reads the concatenation of input files (or standard input if none are given) and produces on
     standard output a version of its input with lines as close to the goal length as possible without exceeding the maximum.  The goal length
     defaults to 65 and the maximum to 10 more than the goal length.  Alternatively, a single width parameter can be specified either by prepend-
     ing a hyphen to it or by using -w.  For example, ``fmt -w 72'', ``fmt -72'', and ``fmt 72 72'' all produce identical output.  The spacing at
     the beginning of the input lines is preserved in the output, as are blank lines and interword spacing.  Lines are joined or split only at
     white space; that is, words are never joined or hyphenated.

     The options are as follows:

     -c      Center the text, line by line.  In this case, most of the other options are ignored; no splitting or joining of lines is done.

     -m      Try to format mail header lines contained in the input sensibly.

     -n      Format lines beginning with a '.' (dot) character.  Normally, fmt does not fill these lines, for compatibility with nroff(1).

     -p      Allow indented paragraphs.  Without the -p flag, any change in the amount of whitespace at the start of a line results in a new para-
	     graph being begun.

     -s      Collapse whitespace inside lines, so that multiple whitespace characters are turned into a single space.  (Or, at the end of a sen-
	     tence, a double space.)

     -d chars
	     Treat the chars (and no others) as sentence-ending characters.  By default the sentence-ending characters are full stop ('.'), ques-
	     tion mark ('?') and exclamation mark ('!').  Remember that some characters may need to be escaped to protect them from your shell.

     -l number
	     Replace multiple spaces with tabs at the start of each output line, if possible.  Each number spaces will be replaced with one tab.
	     The default is 8.	If number is 0, spaces are preserved.

     -t number
	     Assume that the input files' tabs assume number spaces per tab stop.  The default is 8.

     The fmt utility is meant to format mail messages prior to sending, but may also be useful for other simple tasks.	For instance, within vis-
     ual mode of the ex(1) editor (e.g., vi(1)) the command

	   !}fmt

     will reformat a paragraph, evening the lines.

SEE ALSO

     mail(1), nroff(1)

HISTORY

     The fmt command appeared in 3BSD.

     The version described herein is a complete rewrite and appeared in FreeBSD 4.4.

AUTHORS

     Kurt Shoens
     Liz Allen (added goal length concept)
     Gareth McCaughan

BUGS

     The program was designed to be simple and fast - for more complex operations, the standard text processors are likely to be more appropriate.

     When the first line of an indented paragraph is very long (more than about twice the goal length), the indentation in the output can be
     wrong.

     The fmt utility is not infallible in guessing what lines are mail headers and what lines are not.

BSD
								   June 25, 2000							       BSD