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Full Discussion: Help with replacing a char
Top Forums UNIX for Beginners Questions & Answers Help with replacing a char Post 303002500 by arunkumar_mca on Friday 25th of August 2017 10:43:14 PM
Old 08-25-2017
Help with replacing a char

Hello All,

I have a file as below . I want to convert the Y with numbers to H

From
Code:
4,
M11,
P2521759,
Y75,Y70,Y105,Y110,Y700,Y815,Y830,Y900,Y162,Y300,
Y291,Y290,Y15,Y20,
MR2716014,MR2617014,
Yesterday,current
1,201012,
102032,1
11112,0

to
Code:
4,
M11,
P2521759,
H75,H70,H105,H110,H700,H815,H830,H900,H162,H300,
H291,H290,H15,H20,
MR2716014,MR2617014,
Yesterday,current
1,201012,
102032,1
11112,0

I tried to do
Code:
sed -i 's/Y/H/g' file

it converted my Yesterday to Hesterday I want to convert only when there is Y followed by integer

Thanks
Moderator's Comments:
Mod Comment Due to repeated failures to properly format posts, this account has been placed in read only mode for a day.

Last edited by Don Cragun; 08-26-2017 at 02:01 AM.. Reason: Change QUOTE tags to CODE tags; remove unneeded blank lines, fix spacing mourned ICODE tags.
 

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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)
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