Hi,
I want to delete a line in a file that contains a string. I tried:
grep -v "mystring" Myfile > Myfile
But this makes the Myfile empty. I read that I need to do something like:
grep -v "mystring" Myfile > Myfile.new
rm Myfile
mv Myfile.new Myfile
Is there a way to avoid creating a... (2 Replies)
Hi Everybody,
I am trying to write a script that will get some perticuler data from a file and redirect to a file.
My Question is,
I have a Very huge file,In that file I have my required data is started from 25th line and it will ends in 100th line.
I know the line numbers, I need to get all... (9 Replies)
Hello Everyone.
I am trying to display contains of a file from a specific line to a specific line(let say, from line number 3 to line number 5). For this I got the shell script as shown below:
if ; then
if ; then
tail +$1 $3 | head -n $2
else
... (5 Replies)
Hi All,
I have too many .gz files (test.gz).
Task is to remove first line of each file.
Can I do it without unzipping the files?
Your help is appreciated. (4 Replies)
I have this space delimited large text file with more than 1,000,000+ columns and about 100 rows. I want to delete all the cells that consist of just 2 (leave 2's that are not by themselves intact):
File before modification
aa bb cc 2 NA100 dd
aa b1 c2 2 NA102 de
File after modification... (1 Reply)
Hi
I want to delete a line from a txt file for which the line number is user input. Say when user selects 19, the 19th line would be deleted from the file. Can anyone please provide me with a sed one liner for the same... I tried sed -i. The interaction would be like this
Enter the line to... (1 Reply)
Hi
I want to delete a line from a txt file for which the line number is user input. Say when user selects 19, the 19th line would be deleted from the file. Can anyone please provide me with a sed one liner for the same... I tried sed -i. The interaction would be like this
Enter the line... (4 Replies)
Hi all,
I have a huge file(size more that 5GB).
I want to do some manupulation with the records and write to another file.
As the size of the file is huge and there is a space constraint in that directory, I want to delete that record from first file after writing it in to second file.... (3 Replies)
I need to remove double quoted strings from specific lines in a file. The specific line numbers are a variable. For example, line 5 of the file contains
A B C "string"
I want to remove "string". The following sed command works:
sed '5 s/\"*\"//' $file
If there are multiple... (2 Replies)
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)