I'm in a coding mood!
I've come through many ways of conditionally redirect the output of a script like:
But my goal is slightly different. I would like to conditionally redirect the output of a command depending on the status of the command itself:
Obviously this does NOT work. The output of mycommand is printed whatever the status of mycommand is. The output is silenced if mycommand fails but it only applies to subsequent commands.
Any idea how I can achieve this?
Best regards
Santiago
---------- Post updated at 15:24 ---------- Previous update was at 15:15 ----------
I have two extra conditions:
1. I cannot store the output of mycommand in a variable:
The problem is that mycommand outputs binary data including the null character.
2. I' rather not use a temporary file:
Just because I don't like it
Last edited by chebarbudo; 05-11-2016 at 10:25 AM..
Reason: syntax error
hi
i am running script which contains the commmnds and i am redirecting the script output to a file.
like
./script 1> result.txt 2>&1
the above redirection is not working for commands when run in background in a script.
but the problem here result.txt containg output which is repeated.... (3 Replies)
Suppose I have a file named a
When I write
cat a>a
The following error message is displayed
cat: a: input file is output file
and my file a is truncated to zero size.
Also the exit status of the last command is 1
Can someone tell me what actually happens when I do so? (1 Reply)
I want to redirect output of my script to two logfiles.
I tried this :
./run.sh -c APP | tee >(grep " " > AppLogs.log) >(grep "XYZ" > xyz.log) >dev/null
but this does not solve my purpose because logfile xyz.log remains empty untill i stop my script, i want both files, AppLogs.log and... (4 Replies)
I'm redirecting the output of a command to a logfile, however, if the user is on a terminal I would also like the output to be displayed on the screen.
tar tvf some_tarfile >Logfile
if the user is on a term then have the output to the Logfile and also be displayed on the screen at the same... (2 Replies)
Hi there
I have a script that runs but it outputs everything onto the screen instead of a file.
I've tried using the > outputfile.txt however all it does is dump the output to the screen and creates an outputfile.txt but doesn't put anything in that file.
Any help would be appreciated
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Hello i am trying to write a script that will redirect the output to a certain file. Here is the code so far:
#!/bin/bash
ps -e | sort | more > psfile
When I execute the script nothing happens since i assume the output was redirected to the file called psfile. When I try to look at the... (1 Reply)
Hi
I am making a script where i want to redirect the output of ls -l to a file
Example
#ls -l fil1.txt > /opt/temp/a.txt
ac: No such file or directory
I want to capture output of this command
like here output is
ac: No such file or directory
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Hi all
I was wondering if there was a slicker way of doing this without the file -
awk '{print $2}' FS=":" "${FILE}" > "${TMPFILE}"
{
read M_GRP_ID || m_fail 1 "Error: Read failed 1 (${FUNCNAME})"
read M_GRP_WAIT || m_fail 1 "Error: Read failed 2 (${FUNCNAME})"
}... (6 Replies)
Hello,
How can I use a conditional to produce an output file that varies with respect to the contents of column #4 in the data file:
Data file:
9780020080954 9.95 0.49 AS 23.3729
9780020130857 9.95 0.49 AS 23.3729
9780023001406 22.20 0.25 AOD ... (12 Replies)
Discussion started by: palex
12 Replies
LEARN ABOUT ULTRIX
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)