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Full Discussion: Converting String To Integer/Float (weird case)
Top Forums Shell Programming and Scripting Converting String To Integer/Float (weird case) Post 302989360 by wisecracker on Wednesday 11th of January 2017 01:46:10 PM
Old 01-11-2017
Quote:
Originally Posted by Don Cragun
It isn't really clear to me what you're trying to do in cases where there is no <hyphen> character in your output from awk. Is a return value like 000000234 to remain unchanged or do you want to remove leading zeros?

If you always want to remove leading zeros (and never have a string that is all zeros and don't want to change your awk script, you don't need to use bc to perform your arithmetic; it can all be done with variable expansions:
Code:
$ x=000000234
$ echo ${x##*[^1-9-]}
234
$ x=0-123456
$ echo ${x##*[^1-9-]}
-123456
$

Sadly it is not entirely foolproof:-
OSX 10.12.2, default bash terminal.
Here 230 is a valid number.
Code:
Last login: Wed Jan 11 18:39:25 on ttys000
AMIGA:amiga~> x=000000230
AMIGA:amiga~> echo ${x##*[^1-9-]}

AMIGA:amiga~> _

 

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LEARN ABOUT OPENSOLARIS

echo

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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