They mean that $USER is set by some shells only.
I have always used "${USER:-$LOGNAME}" therefore - display LOGNAME if USER is not set.
BTW you can simplify the shell code to
(as well returns 0 or 1).
Or to this one
Or even to this one (returns 0 or a positive number)
Last edited by MadeInGermany; 04-29-2015 at 12:37 PM..
This User Gave Thanks to MadeInGermany For This Post:
Hi, i've got the following:
a=`echo $b | grep '^.*/'`
i'm storing in the variable the value of the variable b only if it has a / somewhere.
It works, but i don't want to print the value. How do i give the value of b to the grep command without the echo?
thanks! (5 Replies)
Hi all,
I am trying to perform a simple task with grep, this is what I execute:
grep -i -n 'error|fail|warning' cl_less.out
when I execute it it does not give any errors, as in the command worked and back to the command prompt, but if I run each grep independently the I do get a real fail:
... (8 Replies)
I am performing a grep command and I need to know how to echo "NONE" or "0" to my file if grep does not find what i am looking for.
echo What i found >> My_File
grep "SOMETHING" >> My_File
I am sure this is easy, I am sort of new at this!
Thanks (2 Replies)
I am trying to use grep -w something as shown below.
grep -w "$a" $LOG1
It is not giving me neither any error nor any data. I am facing the issue while i run this command inside a script. But i am getting the data if i run the above command outiside the script.
here $a=08/11/2009 21
i... (13 Replies)
Hi All
I have a file containing following records:
$HEW_TGT_DB2_USER=hbme_bi2
$prmAttunityUser=ais
$DS_USER=hbme_bi2
$prmStgUser=hbme_bi2
$prmuser=hbme_bi2
$prmStgPass=hbme_bi2
$prmpwd=hbme_bi2
$prmAttunityUser=ais
Say suppose the name of the file is test4.txt
When i fire this... (5 Replies)
Hey im new in this...anything will be helpful...
The user will input the word or phrase .... I want to search the user input in file (by lines) but not all then with this line search on another file ( with the specific line) and show to the user.
Example:
file1.txt
=======
a
aa
aaa... (2 Replies)
Hi,
I have a file f1 wi the following data
f1.txt
========
Report ID
Report Name
-----------------------------------------------------------------
Post Requests : 2 Post successes : 2
=============================================
I need to search for the... (2 Replies)
My current line command is as follows:
echo -n "text: " ; grep "blah text" ../dir1/filename | wc -l
The output to the screen is as needed, but how do I print to a text file? (9 Replies)
Hello,
I've been trying to find the answer to this with Google and trying to browse the forums, but I haven't been able to come up with anything. If this has already been answered, please link me to the thread as I can't find it.
I've been asked to write a script that pulls a list of our CPE... (51 Replies)
Discussion started by: rwalker
51 Replies
LEARN ABOUT OSX
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)