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Full Discussion: Output pipes and incrementing
Top Forums Shell Programming and Scripting Output pipes and incrementing Post 302862841 by Manu1234567 on Friday 11th of October 2013 02:28:24 PM
Old 10-11-2013
Output pipes and incrementing
Hi... Basically, mycode does following:
it loops through every file in directory and gets second lines of those files (second lines contains IPs).

Then it creates a new file with IP which is greater than other IPs.
I have two problems:
1) when I echo for checking A B C D there are nothing...Why? how to fix it?
2) how create a new IP if i need to check all files....Can I check last file which I created and relating to that last IP just increment it? So basically I have find maximum third oct and then fourth oct. But how to do it?
the maximum of third oct and fourth oct is 254.
So for example:
I have three files:
file1 Katty
192.168.1.254.
file2 Manu
192.168.3.154.
file3 Chris
192.168.2.15

So when I run sh mycode, I will have file
with 192.168.3.155

Code:
FILES=/h/HOME/hosts/*
for f in $FILES
do
secondline=` sed -n '2p' $f `
echo  $secondline | IFS="." read A B C D
#echo $A
#echo $B
#echo $C
#echo $D
if  [  $D -ne 255 ]
then
D=` expr $D + 1 `
else

D=0
C=`expr $C + 1 `
fi

echo $A.$B.$C.$D.



done

Last edited by Scott; 10-11-2013 at 05:34 PM.. Reason: This is much a continuation of your previous thread. Closed.
 

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LEARN ABOUT FREEBSD

sdiff

SDIFF(1)							   User Commands							  SDIFF(1)

NAME

       sdiff - side-by-side merge of file differences

SYNOPSIS

       sdiff [OPTION]... FILE1 FILE2

DESCRIPTION

       Side-by-side merge of file differences.

       -o FILE	--output=FILE
	      Operate interactively, sending output to FILE.

       -i  --ignore-case
	      Consider upper- and lower-case to be the same.

       -E  --ignore-tab-expansion
	      Ignore changes due to tab expansion.

       -b  --ignore-space-change
	      Ignore changes in the amount of white space.

       -W  --ignore-all-space
	      Ignore all white space.

       -B  --ignore-blank-lines
	      Ignore changes whose lines are all blank.

       -I RE  --ignore-matching-lines=RE
	      Ignore changes whose lines all match RE.

       --strip-trailing-cr
	      Strip trailing carriage return on input.

       -a  --text
	      Treat all files as text.

       -w NUM  --width=NUM
	      Output at most NUM (default 130) print columns.

       -l  --left-column
	      Output only the left column of common lines.

       -s  --suppress-common-lines
	      Do not output common lines.

       -t  --expand-tabs
	      Expand tabs to spaces in output.

       --tabsize=NUM
	      Tab stops are every NUM (default 8) print columns.

       -d  --minimal
	      Try hard to find a smaller set of changes.

       -H  --speed-large-files
	      Assume large files and many scattered small changes.

       --diff-program=PROGRAM
	      Use PROGRAM to compare files.

       -v  --version
	      Output version info.

       --help Output this help.

       If a FILE is `-', read standard input.  Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.

AUTHOR

       Written by Thomas Lord.

REPORTING BUGS

       Report bugs to <bug-gnu-utils@gnu.org>.

COPYRIGHT

       Copyright (C) 2004 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for sdiff is maintained as a Texinfo manual.  If the info and sdiff programs are properly installed  at  your  site,
       the command

	      info diff

       should give you access to the complete manual.

diffutils 2.8.7 						    April 2004								  SDIFF(1)
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