[KSH] Creating automatic variable from read input Post: 302713191

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Top Forums Shell Programming and Scripting [KSH] Creating automatic variable from read input Post 302713191 by kshji on Wednesday 10th of October 2012 10:50:30 AM

10-10-2012

Registered User

Ksh93, bash, ... give also little nicer syntax version for the arithmetic expansion .
You can put everything inside (( )) and use variables without dollar sign $.
This is not Posix compatible, but look easier to read. Works only in the arithmetic expansion using (( )).

In this example input values has saved to the array and to the string (inputstr).

Code:

inputstr=""
while true
do
 echo -e -n "Input a number (just press ENTER to stop): "
 read input
 [ "$input" = "" ] && break
 array+=( "$input" )              # new element to the array
 inputstr="$inputstr $input"    # join string
done

echo ${array[@]}

sum=0
# take all values from the list, in this case all values from array
for val in ${array[@]}
do
    (( sum+=val ))   # works in ksh93, bash, ...
    # sum=$(( $sum + $val ))  # posix compatible, you can use also let command
done

echo $sum

# or using inputstr
sum=0
for val in $inputstr
do
    (( sum+=val ))   
done

echo $sum

kshji

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sum

SUM(1)								   User Commands							    SUM(1)

NAME

       sum - checksum and count the blocks in a file

SYNOPSIS

       sum [OPTION]... [FILE]...

DESCRIPTION

       Print checksum and block counts for each FILE.

       -r     use BSD sum algorithm, use 1K blocks

       -s, --sysv
	      use System V sum algorithm, use 512 bytes blocks

       --help display this help and exit

       --version
	      output version information and exit

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by Kayvan Aghaiepour and David MacKenzie.

REPORTING BUGS

       Report sum bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report sum translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

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

	      info coreutils 'sum invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							    SUM(1)