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Full Discussion: Remove '.' from file for numbers ending in '.'
Top Forums Shell Programming and Scripting Remove '.' from file for numbers ending in '.' Post 302935541 by DGPickett on Tuesday 17th of February 2015 11:14:22 AM
Old 02-17-2015
Even with ERE, you need to run it twice, perhaps conditionally if the first hits, as you used both start and end field '|'. Otherwise, you miss the following adjacent fields on a line like: "123.|456."

You can add pipes to both ends for the substitute and then remove them:
Code:
sed '
  s/.*/|&|/
  s/\(|[0-9]\{1,99\}\)\.|/\1|/g
  t again
  b end
  :again
  s/\(|[0-9]\{1,99\}\)\.|/\1|/g
  :end
  s/^|//
  s/|$//
 ' in_file

I could have removed both added pipes with one substitute "s/^|\(.*\)|$/\1/" but these back references are a bit slower, in my experience, so I avoid them where possible.

Two passes can be avoided if a less careful pattern is sought, like "s/\([0-9]\).|/\1/", as it encompasses only one pipe. It mangles any non-numeric field with a trailing numer and dot, like "123|The field count of this line is 3.|xyz".
These 2 Users Gave Thanks to DGPickett For This Post:
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LEARN ABOUT DEBIAN

vodovod

vodovod(6)							       Games								vodovod(6)

NAME

       vodovod - lead the water from the house to the storage tank

SYNOPSIS

       vodovod

DESCRIPTION

       Vodovod	is  a  free  game,  released  under  GNU GPL license. Graphics and programming are done by Milan Babuskov. This is an over-weekend
       project for now, so don't expect miracles. However, game is completely playable.

       The goal of the game is to reach the highest possible score. You get a limited number of pipes on each level and need to  combine  them	to
       lead  the  water  from  the  house at the top of the screen to the storage tank at the bottom. For each pipe water goes through, you get 20
       points and if you fill the cross-pipe both ways, you get 60 points. At end of each level, you are awarded depending on the skill level:

	* Beginner: 100 points
	* Toolman: 100 points + number of pipes remaining
	* Master plumber: 100 points + 2 x number of pipes remaining

       Some of the levels have obstacles where you cannot place pipes, checkpoints through which the water must go and holes in  the  ground  that
       slow  the  flow. Select HELP from the main menu to get more info. The game is playable with joystick/joypad: just move it and press buttons
       when you go to Options -> Configure controls

USAGE

       The goal of the game is to use pipes to connect the house at the top of the screen with the tank at the bottom. You have time to  construct
       the initial pipeline before the man enters the house.

       For  each level you get a limited number of pipes, so use them wisely. If you make a mistake, you can place another pipe over it.

       There are certain special blocks in the map:
	* Blocked Area	     - You cannot place pipes on these fields.
	* Checkpoint	     - Your pipeline must go through this field.
	* Hole in the ground - Slows down the flow.

SEE ALSO

       You can find more information at http://home.gna.org/vodovod/

								     May 2007								vodovod(6)
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