Replace pattern from nth field from a file Post: 302950534

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Top Forums Shell Programming and Scripting Replace pattern from nth field from a file Post 302950534 by Don Cragun on Sunday 26th of July 2015 07:15:54 AM

Old

07-26-2015

Registered User

Quote:

Originally Posted by Amit Joshi

Code:

$ cat /cygdrive/d/Final2.txt
1,A ,Completed, 07.03_23.01 ,Jun 30 20:00
2,BBB,Pending,,
3,CCCCC,Pending,,
4,DDDDD,Pending,,
5,E,Pending,,
6,FFFF,Pending,,
7,G,Pending,,

In the above file 4th field is date which is in MM.DD_HH.MIN format and I need to convert it to as it is there in 5th columns.

Any idea how I can do that in unix shell script with sed or awk or any other command ?

Is this a homework assignment? There are special rules for homework submissions.

If this isn't homework, I still don't understand what you're trying to do. The 4th field in most of your input lines is an empty string (not in the format MM.DD_HH.mm) and the one line that does have something like that also has leading and trailing <space>s. What do you mean by "convert it to as it is there in 5th columns"? Are you saying that you want the output to be:

Code:

1,A ,Completed,Jun 30 20:00,Jun 30 20:00
2,BBB,Pending,Jun 30 20:00,
3,CCCCC,Pending,Jun 30 20:00,
4,DDDDD,Pending,Jun 30 20:00,
5,E,Pending,Jun 30 20:00,
6,FFFF,Pending,Jun 30 20:00,
7,G,Pending,Jun 30 20:00,

Don Cragun

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LEARN ABOUT SUNOS

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)