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Full Discussion: Counting a chars IF == "x"
Top Forums Shell Programming and Scripting Counting a chars IF == "x" Post 302285175 by silkiechicken on Saturday 7th of February 2009 03:46:13 PM
Old 02-07-2009
Data Counting a chars IF == "x"
I'm new at this script stuff... only have minor exposure to java.

My problem is largely syntax and being unable to figure out what the manuals are telling me what each option does. Basically I have a hard time understanding the documentation and need help with what awk is capable of on the shell command line.

I have a file and if the line does not start with a ">" I want to count all the characters but not spaces. Just [A-Z]. In this case I know the characters are going to be A E or Z.

My thinking has got me this far so far..

If myfile is "ATHROUGHZ SPACES"

grep -v ">" myfile.tab | awk if nextChar == "A || E || Z" {++count} END {print count}'


I want it to return 4, because there are two A, one E and one Z.



The grep part was to select for the lines that did not contain ">".



The {++count} END {print count}' part is to count and then print the count


However I am stuck in the middle part which is highlighted in red.



I haven't found (or understood how to use) anything that lets me go through the line character by character to compare it with if it is a desired letter and count it if it is a match.


I found the following threads but don't understand them enough to apply them to my situation.



https://www.unix.com/shell-programming-scripting/9721-counting-characters.html
From this one it appears that -F won't work to seperate the characters because it is used to seperate strings?



https://www.unix.com/unix-dummies-questions-answers/58760-counting-occurence-particular-characters.html
From this one, I don't have seperators between the characters


https://www.unix.com/shell-programming-scripting/39765-counting-number-occurances-all-characters-z-string.html
This thread is in reference to PEARL which I am not familar with, and not sure how is to be applied to just the command line?

If anyone has any suggestions or good directions to point me for what feels like should be incredibly easy to do, it would be awesome!

Thanks a bunch!

-Diana
 

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LEARN ABOUT DEBIAN

seqdiag

SEQDIAG(1)						      General Commands Manual							SEQDIAG(1)

NAME

       seqdiag - generate sequence-diagram image file from spec-text file.

SYNOPSIS

       seqdiag [options] file

DESCRIPTION

       This manual page documents briefly the seqdiag commands.

       seqdiag is generate sequence-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -a, --antialias
	      Pass diagram image to anti-alias filter

       -c FILE, --config=FILE
	      read configurations from FILE

       -o FILE
	      write diagram to FILE

       -f FONT, --font=FONT
	      use FONT to draw diagram

       -T TYPE
	      Output diagram as TYPE format

SEE ALSO


       The programs are documented fully by
       http://tk0miya.bitbucket.org/seqdiag/build/html/index.html

AUTHOR

       seqdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   May 21, 2011 							SEQDIAG(1)
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