... ... ...
Is there any special reason why you use
instead of
?
In this case, they are synonymous. The braces must be used if the character following the variable name is a valid character in a variable name and when referencing a multi-digit positional parameter. Some people always use braces around shell variable names to emphasize which characters are in the variable name.
Note that both:
expand to the contents of the 1st positional parameter followed by the character "1" (even if there are eleven or more positional parameters), but both:
expand to the contents of the variable X11 even if X1 is defined and X11 has not been defined.
New to awk and need some help. I have a script that I would like to make more compact. I want to read a file and grab every field, from every record, except the last field. The records are variable length and have varying number of fields. A record will have at least two fields, but can have... (9 Replies)
As part of a bigger task, I had to read thru a file and separate records into various batches based on a field. Specifically, separate records based on the value in the batch field as defined below. The batch field left-justified numbers.
The datafile is here
> cat infile
12345 1 John Smith ... (5 Replies)
I have a file which is having fileds separtaed by delimiter.
Ex:
C;4498;qwa;cghy;;;;40;;222122
C;4498;sample;city;;;;34 2;;222123
C;4498;qwe;xcbv;;;;34-2;;222124
C;4498;jj;sffz;;;;41;;222120
C;4498;eert;qwq;;;;34 A;;222125
C;4498;jj;szxzzd;;;;34;;222127
out of these records I... (3 Replies)
So, I'm making a little awk script that generates a range-based histogram of a set of numbers. I've stumbled onto a strange thing. Toward the end of the process, I have this test:
if ( bindex < s )
"bindex" is the "index" of my "bin" (the array element that gets incremented whenever a... (2 Replies)
In a bash shell, I have to prefix a variable to two .CSV files File1.CSV and File2.CSV. One of the files has a header and the other one is with no header in the below format:
"value11","value12","value13","value14","value15","value16"
"value21","value22","value23","value24","value25","value26"... (7 Replies)
I am confused by the value of "currdisk->currangle" after adding operation. Initially the value of "currdisk->currangle" is 0.77500000000000013, but after adding operation, it's changed to "-nan(0x8000000000000)", Can anyone explain ? Thanks! The following is the occasion of gdb debugging.
3338 ... (8 Replies)
Hello,
I am trying to concatenate a string in a bash script like this:
runCmd="docker run -e \"IMAGE_NAME=$IMAGE_NAME\" "
env | grep "$ENV_SUFFIX" | while read line; do
envCmd="-e \"${line}\" "
runCmd=$runCmd$envCmd
echo $runCmd # here concatenation works fine
done
echo... (3 Replies)
How does one assign a variable, x to equal the number of records in a different file.
I have a simple command such as below:
awk -F "\t" '(NR>5) { if(($x == "0/0")) { print $0} }' a.txt > a1.txt
but I want x to equal the number of records in a different file, b.txt (10 Replies)
Hello ,
I have below files
a) File A
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root xmlns="http://aaa/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema" version="2.0">
<project name="source">
<mapping name="m_Source">
<parameter... (3 Replies)
Discussion started by: Pratik4891
3 Replies
LEARN ABOUT OPENSOLARIS
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)