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Full Discussion: Remove carriage return from the variable
Top Forums Shell Programming and Scripting Remove carriage return from the variable Post 302878404 by Meacham12 on Friday 6th of December 2013 02:36:13 AM
Old 12-06-2013
Remove carriage return from the variable
Hi,

I try to handle very large numbers with a bash script. I run ssh command in a remote server and store the output in a local variable. But this output contains a return carriage at the end. So I try to remove it by tr But I can't figure out the right notation with printf. So my problem is:

Code:
 
var1=$( some command )

echo $var1
2.80985e+09
 
var2=`expr $var1 + 10000000`
expr: non-integer argument

printf "%f\n" $var1
2809850000.000000

printf "%s\n" $var1
2.80985e+09

If I use tr -dc '[:digit:]' with this printf output, it will remove all non character not only return carriage at the end.

So for first notation it will give me a number like 2809850000000000 and for second 28098509 and both incorrect. I need a display like 2809850000 so tr could only remove return carriage. So which parameter of printf would produce this notation? (w/o exponential nor decimal notation)

Thanks
Last edited by Meacham12; 12-06-2013 at 04:23 AM..
 

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LEARN ABOUT NETBSD

seq

SEQ(1)							    BSD General Commands Manual 						    SEQ(1)

NAME

     seq -- print sequences of numbers

SYNOPSIS

     seq [-w] [-f format] [-s string] [-t string] [first [incr]] last

DESCRIPTION

     The seq utility prints a sequence of numbers, one per line (default), from first (default 1), to near last as possible, in increments of incr
     (default 1).  When first is larger than last the default incr is -1.

     All numbers are interpreted as floating point.

     Normally integer values are printed as decimal integers.

     The seq utility accepts the following options:

     -f format	   Use a printf(3) style format to print each number.  Only the A, a, E, e, F, f, G, g, and % conversion characters are valid,
		   along with any optional flags and an optional numeric mimimum field width or precision.  The format can contain character
		   escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89'').  The default is %g.

     -s string	   Use string to separate numbers.  The string can contain character escape sequences in backslash notation as defined in ANSI
		   X3.159-1989 (``ANSI C89'').	The default is 
.

     -t string	   Use string to terminate sequence of numbers.  The string can contain character escape sequences in backslash notation as
		   defined in ANSI X3.159-1989 (``ANSI C89'').	This option is useful when the default separator does not contain a 
.

     -w 	   Equalize the widths of all numbers by padding with zeros as necessary.  This option has no effect with the -f option.  If any
		   sequence numbers will be printed in exponential notation, the default conversion is changed to %e.

     The seq utility exits 0 on success and non-zero if an error occurs.

EXAMPLES

	   # seq 1 3
	   1
	   2
	   3

	   # seq 3 1
	   3
	   2
	   1

	   # seq -w 0 .05 .1
	   0.00
	   0.05
	   0.10

SEE ALSO

     jot(1), printf(1), printf(3)

HISTORY

     The seq command first appeared in Plan 9 from Bell Labs.  A seq command appeared in NetBSD 3.0.  This command was based on the command of the
     same name in Plan 9 from Bell Labs and the GNU core utilities.  The GNU seq command first appeared in the 1.13 shell utilities release.

BUGS

     The -w option does not handle the transition from pure floating point to exponent representation very well.  The seq command is not bug for
     bug compatible with the Plan 9 from Bell Labs or GNU versions of seq.

BSD
								   May 27, 2010 							       BSD
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