Not sure I understand. You want to eliminate non-printable chars from a string?
in pseudo code :
MY_VAR should set to null if it contains one or more not printable character
Somethings like
my current filter is ---------- Post updated at 13:09 ---------- Previous update was at 12:54 ----------
Hello
would appreciate if somebody can post a bash script that checks if the first character of the given string is equal to, say, "a"
thnx in advance (2 Replies)
i have a file contains like this:
i want to create a script that will insert a comma "." after the 10th character so it would be look like this
thanks in advance (5 Replies)
I'm working with a large file with multiple records, each record begins with ISA. The issue is, sometimes ISA is at the start of the line, sometimes it's in the middle of the line. So before I can csplit my main file into multiple records, I have to get each record header onto its own line.
... (7 Replies)
cp $l_options $srcdirfile $destdirfile
If i want to check whether there is a non printable character in the variables
$l_options $srcdirfile $destdirfile
how it can be done? (2 Replies)
Hi!
If I want to extract a character from a specific position of a string, I can use ${string:1:1} (if I want character at the position 1). How can I do the same thing, when the number of position is contained in the variable? ${string:$var:1}doesn't work, unfortunately.
Thanks in advance. (2 Replies)
In bash, how can one remove the last character of a string? In perl, the chop function would remove the last character. However, I do not know how to do the same job in bash.
Many thanks in advance. (12 Replies)
Hello.
I am using :
sed -i -e '/§name_script§/a#'"${MY_TAB11}"'# \
#'"${MY_TAB1}"'The Standard way'"${MY_TAB7}"'# \
#'"${MY_TAB1}"'==============='"${MY_TAB7}"'# \ ' "$CUR_FILE"
Is there a better way to define "MY_TAB7","MY_TAB11" in other way than :
MY_TAB1=$'\t'
MY_TAB2=${MY_TAB1}$'\t'... (2 Replies)
I am writing a bash script that will find all references to the “Well_List” in the “Comp_File”.
I am filtering a Well_List that contains the following:
TEST_WELL_01
TEST_WELL_02
TEST_WELL_11
TEST_WELL_22
GOV_WELL_1
GOV_WELL_201
PUB_WELL_57
PUB_WELL_82
.
.
Comparison... (5 Replies)
For some testing I want to insert a non printable character in a file. How to do it? I inserted ctrl-v ctrl-k through vi. But I do not think it is a proper non printable character. (3 Replies)
Hi,
I am new in bash scripting. In my work, I provide support to several users and when I connect to their computers I use the same admin and password, so I am trying to create a script that will only ask me for the IP address and then connect to the computer without having me to type the user... (5 Replies)
Discussion started by: arcoa05
5 Replies
LEARN ABOUT LINUX
ppmtopgm
ppmtopgm(1) General Commands Manual ppmtopgm(1)NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original
image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b.
Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can
read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting
color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original
colors, not necessarily a way that looks like a black and white photograph.
QUOTE
Cold-hearted orb that rules the night
Removes the colors from our sight
Red is gray, and yellow white
But we decide which is right
And which is a quantization error.
SEE ALSO pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
10 April 2000 ppmtopgm(1)