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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 SUSE

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-a] [-c COMMAND] [-f] [-q] [-t] [file]

DESCRIPTION

     Script makes a typescript of everything printed on your terminal.	It is useful for students who need a hardcopy record of an interactive
     session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     Options:

     -a      Append the output to file or typescript, retaining the prior contents.

     -c COMMAND
	     Run the COMMAND rather than an interactive shell.	This makes it easy for a script to capture the output of a program that behaves
	     differently when its stdout is not a tty.

     -f      Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super-
	     vise real-time what is being done using `cat foo'.

     -q      Be quiet.

     -t      Output timing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time
	     elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used
	     to replay typescripts with realistic typing and output delays.

     The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not
     set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  Script works best with commands that do not manipulate
     the screen, the results are meant to emulate a hardcopy terminal.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism), scriptreplay(1).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     Script places everything in the log file, including linefeeds and backspaces.  This is not what the naive user expects.

AVAILABILITY

     The script command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

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