How can I redirect all stdout and stderr messages from a command to /dev/null (or to a file if need be) except messages that start with the word 'foo'? Messages that start with 'foo' need to be displayed in real time (i.e., when they are sent to stdout/stderr by the command). Thanks. (5 Replies)
Hello!
I have somo problems with simple scripts like this:
#!/bin/bash
echo -n "Enter your name and press : "
read var_name
echo "Your name is: $var_name"
When I try to run it, this error occurs: ':not a valid identifier var_name.
Why?? (I work in cygiwin)
Is there anybody out... (10 Replies)
i write a shell program and i execute that after i made a bin directiry in my home directory(i didnt give any permissions)
now i change to other directory.then i execute it bit it is saying " no such a file or directory"
can any one help me please (2 Replies)
I am having an issue with using cygwin (on Windows XP). My script errors on if -command. The script here works fine on Linux, but cygwin fails...
#!/bin/sh
if then
echo "Test"
fi
The error -message:
./ShellTest.sh: line 4: syntax error near unexpected token `fi'
./ShellTest.sh:... (1 Reply)
hi and sorry for crossposting...
I have data, the first column is the date ("2011 02 03 12 45") and follow I have the measurements . What I would like to do is:
to read the data line by line and write the data of "today" in a new file and "yesterday" as well in another file, separated by... (2 Replies)
Hey all,
Writing a program that searches for a username and if they are online creates a 'beep' and sends the username and date to a log file.
the error i am getting is:
paul.obrien16@aisling:~/os$ bash checklogin
: command not found
Enter username
paul.obrien16
': not a valid... (2 Replies)
Hello,
I am new to shell scripting. I have a question I would greatly appreciate any suggestions on. I am writing a ksh script that will launch bin files. The files are owned root and the application runs under root. The application administrators do not get root access. The script is intended... (1 Reply)
List directories at the home directory in increasing order.
First of all is this correct?
cd ~/
du -h|sort -n|more
First command is to go to the home directory and second does the rest.
Is there a way to do them in single command.
Thanks in advance. (1 Reply)
Hey all,
I would like to ask your help and sorry in advance for my ignorance since I am a complete beginner in this.
I need to create a UNIX script that will:
- scan a small number of folders and subfolders (see a similar file tree in the attachment)
-
- for each final folder (each of... (8 Replies)
Hi,
can someone explain how this aliases work:
alias m 'if ( \!:$ =~ *gz) set status = 1 && most \!:$ || gzcat \!:1 | most '
I mean, I know what it does, but I don't know how
- what is \!:$ and \!:1
- how do it used the && and ||
- what it does with status variable?
thanks (3 Replies)
Discussion started by: tzvikao
3 Replies
LEARN ABOUT LINUX
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)