grep $SEARCH_STRING /etc/passwd | cut -d":" -f 1,5
I need to check the $? value of grep in the above. If I place a test for $? after the above piped command, it returns success status of grep piped to cut.
How can I get the success status of grep alone? (5 Replies)
Hi there,
I'm puzzled. Compressing the same file (same name, same md5sum) at two different times will produce a different output. I mean the md5sum of the resulting .gz files are different.
Does it make any sens to any of you?
I'd like some explanations if you know what's going on.
Thanks... (4 Replies)
Using ls input as example..
ls | sed 's/\n/ /'outputs with line breaks, where I was expecting the \n to disappear. I've tried \r as well wondering if terminal output used different breaks.
Is there a way to remove the line breaks without saving to file and then working from there?
----------... (2 Replies)
Hi All,
I have a random test file: test.txt, size: 146
$ ll test.txt
$ 146 test.txt
Take 1:
$ cat test.txt | gzip > test.txt.gz
$ ll test.txt.gz
$ 124 test.txt.gz
Take 2:
$ gzip test.txt
$ ll test.txt.gz
$ 133 test.txt.gz
As you can see, gzipping a file and piping into gzip... (1 Reply)
Hi,
I have 1 program that writes in to the STDIN of another program as shown below. Both programs contain 4 or 5 lines & would terminate in under a second.
$ driver.exe | program.exe
How is that I can attach the debugger (gdb) to program.exe ? so that I can step through and see what all... (0 Replies)
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Hi,
I am somewhat new to Perl and currently checking it out. I have a problem testing, if there is nothing being piped in to that script.
I am reading input from STDIN this way:
while( defined($line = <STDIN>) ) {
chomp($line);
if( $line =~ m/($ARGV)/g ) {
... (7 Replies)
Greetings!!
am trying to retrieve a particular section from the url as in url.txt..
aim is to get the 83.8 MB as output, but somehow this is not happening!, please suggest what might be wrong.. attached is the screenshot and text file of the page source.
Best Regards,
Vinu (14 Replies)
The old buffering problem again, in a very specific case. On FreeBSD this time, but it's the generic line-buffered vs fully-buffered problem.
I'm trying to pick an available bluetooth speaker (all named audio_N), by pinging all of them en mass and taking the first to respond.
The... (10 Replies)
Discussion started by: Juha Nurmela
10 Replies
LEARN ABOUT DEBIAN
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)