the command line "cat myFile.txt | ..." was only for an example and was present in my both tests, for an equality. ^^
For example, here the test 1 :
Code:
cat myFile.txt | grep -o "toto"
And here the second test :
Code:
cat myFyle.txt | ./test2.sh
with in test2.sh :
Code:
while read line
do echo $line | grep -o "toto"
done
So, between those tests, there is the "while" and the "echo" in difference.
Sure, the "echo" imply a lost of performances, but I don't think it's very important. So, it would come from the "while".
Of course, grep is faster because it is written in C, but it is in both case. So it should not change so much...
So, what did I miss ? ^^
---------- Post updated at 02:25 AM ---------- Previous update was at 02:07 AM ----------
So, i made some other tests :
Test 1 :
Code:
while read line
do echo $line; grep "coucou"
done
This is so long !
Test2 :
Code:
while read line
do echo $line; grep "coucou"
echo $line; grep "hello"
done
Twice longer !
Test 3 :
Code:
while read line
do grep "coucou"
done
Almost as quick as a normal grep.
So, my problem would not come from my pipe, but how I use it.
Two solutions :
- "echo" slows my script.
- the use of the var $line slows my script.
I think it's the second solution. And you ? ^^'
Last edited by Scott; 08-17-2011 at 05:16 AM..
Reason: Please use code tags
Hi guys,
I am new to AWK and unix scripting. Please see below my problem and let me know if anyone you can help.
I have 2 input files (example given below)
Input file 2 is a standard file (it will not change) and we have to get the name (second column after comma) from it and append it... (5 Replies)
Hi,
I want to check a particular word is in standard error output or not. Can I acheive it in single command?
For example,
Delete file_name 2>error.log
cat error.log
Output:
XXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX
Successfully deleted
XXXXXXXXXXXXXXXXX
where delete is... (2 Replies)
Hi everyone,
Is there any way to use the pipe "|" operator to pass more than one input? For instance do:
(command1) (command2) | command3
with command 3 taking 2 parameters?
or maybe using ``s?
Thanks!
Anthony (4 Replies)
Hello,
I'm trying to figure out how best to approach this script, and I have very little experience, so I could use all the help I can get. :wall:
I regularly need to delete files from many directories.
A file with the same name may exist any number of times in different subdirectories.... (3 Replies)
Hi guys,
I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file
for eg:
file 1:
xx|yy|"xyz|zzz"|zzz|12...
using below awk command
awk 'BEGIN {FS=OFS="|" } print $3
i would get xyz
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Dear Friends,
I am looking for a shell script to merge input files into one file .. here is my idea:
1st paramter would be outfile file (all input files content)
read all input files and merge them to input param 1
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Hello,
I have an ffmpeg bash script which is working nice and
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To create new scripts and to deal with multiple bash files sounds not logical. It is a bit hard to manage for me..
I wondered if it was possible to make my input file as variable.
Then I... (1 Reply)
Hello,
Normally below script works, could you please comment out what could be the reason of failure if there are spaces in input filename:
script.sh
#!/bin/bash
cd /home/hts/.hts/tvh/
file="$1 $2 $3 $4"
read -d $'\x04' name < "$file"
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Dear UNIX forum members,
I am using macbook pro 13 (2015 edition) with MAC OS Mojave and am trying to write the shell script where when it is run through terminal it asks for an input (in the code below an input variable is domains) and then that input becomes capital letter or letters which... (3 Replies)
Discussion started by: Aurimas
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)
08-17-2011
