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Full Discussion: how to get the variable in while loop outside of it?
Top Forums Shell Programming and Scripting how to get the variable in while loop outside of it? Post 302571225 by munish259272 on Sunday 6th of November 2011 11:07:04 PM
Old 11-07-2011
how to get the variable in while loop outside of it?
bash-3.00$ cat compare.sh
#NOTE : 1.Filename must not have space for the script to work.
# 2.Script wont work if symlinks are there instead of proper filenames.

Code:
#!/bin/bash
#set -x

#############################VERIFYING THE EXISTENCE OF DUPLICATE FILENAMES IN THE SUPPLIED FILENAMES ###############

if [[ $# -lt 1 ]];then
echo "Usage : `basename $0` filename" 1>&2
exit 2
fi
awk '{f=$9;
        for(i=10;i<=NF;i++)
           f=f" "$i;
           d[f]++;
     }
END{
        for(f in d)
                if(d[f] > 1)
                 printf("file %s occurs %d times\n",f,d[f]);
                                                    }' `basename $1`
echo -e  "Please remove the dupliacte entries,\
\nkeep the file with the latest timestamp and check again"

################################CHECKING SIZE,DATE,TIME,FILENAME WITH THE EXISTING FILES############################

status=0
cat $1 | awk '{print $(NF-4),"\t",$(NF-3),"\t",$(NF-2),"\t",$(NF-1),"\t",$(NF)}' | \
while read size mon day time filename; do
    if [[ ! -f "$filename" ]]; then
        echo "ERROR: no such file: $filename" >&2
        status=1
    else
        filesize=$(ls -lrt "$filename" | awk '{print $5}')
        if [[ "$size" != "$filesize" ]]; then
            echo "ERROR: size mismatch: $filename" >&2
            status=1
        else
           # filetime=$(ls -lrt "$filename" | awk '{print $6," ",$7," ",$8}')
                actual_mon=$(ls -lrt "$filename" | awk '{print $6}')
                actual_day=$(ls -lrt "$filename" | awk '{print $7}')
                actual_time=$(ls -lrt "$filename" | awk '{print $8}')
            if [[ "$mon $day $time" != "$actual_mon $actual_day $actual_time" ]]; then
                echo "ERROR: date mismatch: $filename" >&2
                status=1
            fi
        fi
    fi
done
echo $status
if [[ "$status" -eq 0 ]];then
echo -e "\t\n\nSuccess! All the files are found and their size and timestamp is also matching with the existing files."
else
echo -e "\t\n\nFailure! Non-matching files are found or file doesn't exist."
fi


The value of status always remains 0.
How do i get the changed value from inside the while loop


On the other hand :
Code:
bash-3.00$ cat scope.sh
#!/bin/bash
x=0
while [[ "$x" -lt 10 ]];do
x=$(($x+1))
done
echo $x

here, the value of x changes to 10

why is this deviation.

Please help me i need to access the changed value in the first script but i am unable to do it.
Last edited by Franklin52; 11-07-2011 at 06:03 AM.. Reason: Please use code tags for data and code samples, thank you
 

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LEARN ABOUT REDHAT

openvt

OPENVT(1)							     Linux 1.x								 OPENVT(1)

NAME

       openvt - start a program on a new virtual terminal (VT).

SYNOPSIS

       openvt [-c vtnumber] [-s] [-u] [-l] [-v] [--] command command_options

DESCRIPTION

       openvt  will  find the first available VT, and run on it the given command with the given command options, standard input, output and error
       are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified  then  the
       environment variable $SHELL is used.

   OPTIONS
       -c vtnumber
	      Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work.

       -s     Switch to the new VT when starting the command. The VT of the new command will be made the new current VT.

       -u     Figure out the owner of the current VT, and run login as that user.  Suitable to be called by init. Shouldn't be used with -c or -l.

       -l     Make the command a login shell. A - is prepended to the name of the command to be executed.

       -v     Be a bit more verbose.

       -w     wait  for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com-
	      mand completes.

       --     end of options to openvt.

NOTE

       If openvt is compiled with a POSIX (GNU) getopt() and you wish to set options to the command to be run, then you must  supply  the  end	of
       options -- flag before the command.

EXAMPLES

       openvt can be used to start a shell on the next free VT, by using the command:

       openvt bash

       To start the shell as a login shell, use:

       openvt -l bash

       To get a long listing you must supply the -- separator:

       openvt -- ls -l

HISTORY

       Earlier, openvt was called open.  It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>.  The -w idea is from "sam".

SEE ALSO

       chvt(1), doshell(8), login(1)

19 Jul 1996							       V1.4								 OPENVT(1)
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