I have a question to do and it's somewhat confusing. It says, and I quote
"Create a file called file_1 with three lines of text in it. Create a shell variable called "f_name", assign it the string "file_1". Use the cat command and the variable "f_name" to display the contents of the file... (3 Replies)
I am not able to read inside a while though i get the message "inside read" the cursor doesnt prompt from the console
cat file | while read ln_new_engine_dirs
do
echo "inside $ln_new_engine_dirs"
if
then
read nn
echo "inside read"
fi
done
Thanks in advance (3 Replies)
Hi,
How to add string inside the file. In this case adding 63 in the beginning of each line. Thnks.
e.g. what is inside the file
Mobile Number Portability
9051151234
9051261345
9051393245
9051412345
9051507654
should like this as output:
Mobile Number Portability (7 Replies)
Hi,
Im struggling with what chmod to change the permission of a file in the current directory named MyFile so the command "cat MyFile" fails to display the file.?? (10 Replies)
Hello...
I am trying to loop through my hosts file that contains 100+ servers to check or update the nameservers on them...
My while loop is breaking after the first server responds...
#!/bin/bash
while read line; do
a=( $(echo $line | tr " " "\n") )
if }" != "" ] && }" != "#" ] &&... (1 Reply)
Learning, stumbling! My progress in shell scripting is slow. Now I have this doubt:
I have the following file (users.txt):
AU0909,on
AU0309,off
AU0209,on
AU0109,off
And this file (userson.txt)
AU0909
AU0209
AU0109
AU0309
I just want to set those users on userson.txt to "off" in... (14 Replies)
Hi All,
When i use sort Test, here is the output:
$ sort Test
a
b
b
c
d
e
f
g
h
i
But the contents in the file remain unsorted, how to do that?
]$ cat Test
g
i (6 Replies)
Hi,
I have list of files present in a folder. I want to search for a particular keyword sequentially and create a file which will be later used by some other program.
Input files:
$ ls
a.dsx b.dsx c.dsx Dataline_.txt Dataline.txt loop.sh
$ cat *.dsx
help
tyiis
global
for i in... (4 Replies)
Discussion started by: mac4rfree
4 Replies
LEARN ABOUT REDHAT
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)