Let me try to make it simple and explain you. awk works on a theme which is <:condition:><:action/operations:> so lets say if you have given one condition as follows:
Code:
awk '($1>2){print $0}' Input_file
So in above example you are checking condition if $1 is greater than 2 then if condition is TRUE then you are asking it to perform action {print $0}, which will print the $0(means complete line) whose $1 is grater than value 2. Now if we are giving like as follows.
Code:
awk '($1>2)' Input_file
So in above example whenever condition is going to be TRUE then as there is NO action given by us to perform so awk will perform the default action which is printing the line. Similarly by giving 1 in code we are making condition TRUE and not giving any further actions so when condition is TRUE and no action given so awk will do default action which is print. Hope this helps you, enjoy learning
EDIT: Like an example as follows.
Code:
awk '($1>2){next} 1' Input_file
So in above example you are giving condition like if $1 is grater than 2 then perform action which is next, means don't do any further action but if condition is FALSE then it will not perform any action and will go to 1 and as 1 will make condition TRUE with no action further given so it will print the line, so basically whichever line's $1 is grater than 2 we are skipping them here.
Thanks,
R. Singh
Last edited by RavinderSingh13; 10-04-2015 at 03:46 PM..
Reason: Added an example for same now.
I am not that good with AWK. Is there a simple awk command I could use to get the word "this" from the following text besides using "awk -F ":" '{print $2} | awk -F " " '{print $1}"?
:this is:that is: (6 Replies)
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Hello all,
Here is what my bash script does: sums number columns, saves the tot in new column, outputs if tot >= threshold val:
> cat getnon0file.sh
#!/bin/bash
this="getnon0file.sh"
USAGE=$this"
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Min="0.05"
#
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Hi,
I have a file such that:
40454,31,48,4,1304.967741935484,1
31708,25,48,4,1268.32,1
20900,64501,671,788,0.3240259840932699,0
20137,51358,834,743,0.3920908135051988,0
I want to replace the 6th column by "ones" if it is 1, and with "zeros" if it is 0.
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Hi, this must be a simple but this is my first interaction with shell and awk.
following is a log file needed to parse (2 lines separated by a line break for clarity):
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Hello,
I have two text files, each with a single column,
file 1:
124152970
123899868
123476854
54258288
123117283
file 2:
124152970
123899868
54258288
123117283
122108330 (5 Replies)
Discussion started by: LMHmedchem
5 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)
10-04-2015
