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Full Discussion: Assigning bc output to a variable
Top Forums Shell Programming and Scripting Assigning bc output to a variable Post 302871891 by Akshay Hegde on Thursday 7th of November 2013 07:21:57 AM
Old 11-07-2013
Quote:
Originally Posted by apmcd47
Try:
Code:
#! /bin/bash

while read b
do

    echo "($b+0.5)/1" | bc        # line 6 - works
    val=$(($b+0.5)/1 | bc)        # line 7 - should now work
    echo $val                          # line 8

done < infile

Basically $(...) invokes command substitution such that the output of command/subshell can be assigned to a variable.

Andrew
@ apmcd47 your solution gives error

if ksh93 then this will work
Code:
val=$((b+0.5/1))

Try this for bash

Code:
$ b=5000
$ echo "($b+0.5)/1" | bc 
5000
$
$ variable=$(echo "($b+0.5)/1" | bc )
$ echo $variable
5000

if floating point is needed then try
Code:
$ var=$(echo "scale=1;$b+0.5/1" | bc) 
$ echo $var
5000.5

Last edited by Akshay Hegde; 11-07-2013 at 08:38 AM..
 

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LEARN ABOUT DEBIAN

crmgr

CRMGR(1)						      Quick Database Manager							  CRMGR(1)

NAME

       crmgr - administration utility for QDBM Curia

SYNOPSIS

       crmgr create [-s] [-bnum num ] [-dnum num] name
       crmgr put [-kx|-ki] [-vx|-vi|-vf] [-keep|-cat] [-lob] [-na] name key val
       crmgr out [-kx|-ki] [-lob] name key
       crmgr get [-nl] [-kx|-ki] [-start num] [-max num] [-ox] [-lob] [-n] name key
       crmgr list [-nl] [-k|-v] [-ox] name
       crmgr optimize [-bnum num] [-na] name
       crmgr inform [-nl] name
       crmgr remove name
       crmgr repair name
       crmgr exportdb name dir
       crmgr importdb name dir
       crmgr snaffle [-kx|-ki] [-ox] [-n] name key
       crmgr version

DESCRIPTION

       This manual page documents briefly the crmgr commands.

       crmgr  is  a utility for debugging Curia and its applications. It features editing and checking of a database. It can be used for the data-
       base applications with shell scripts. This command is used in the above format.	name specifies a database name. key specifies the key of a
       record.	val specifies the value of a record.

OPTIONS

       A summary of options is included below.	For a complete description, see the file:///usr/share/doc/qdbm-doc/spex.html#curiacli.

       -s     make the file sparse.

       -bnum num
	      specify the number of the elements of the bucket array.

       -dnum num
	      specify the number of division of the database.

       -kx    treat key as a binary expression of hexadecimal notation.

       -ki    treat key as an integer expression of decimal notation.

       -vx    treat val as a binary expression of hexadecimal notation.

       -vi    treat val as an integer expression of decimal notation.

       -vf    read the value from a file specified with val.

       -keep  specify the storing mode for `CR_DKEEP'.

       -cat   specify the storing mode for `CR_DCAT'.

       -na    do not set alignment.

       -nl    open the database without file locking.

       -start specify the beginning offset of a value to fetch.

       -max   specify the max size of a value to fetch.

       -ox    treat the output as a binary expression of hexadecimal notation.

       -lob   handle large objects.

       -n     do not output the tailing newline.

       -k     output keys only.

       -v     output values only.

SEE ALSO

       qdbm(3), crtsv(1), curia(3), cropen(3).

AUTHOR

       QDBM was written by Mikio Hirabayashi <mikio@fallabs.com>.

       This manual page was written by Fumitoshi UKAI <ukai@debian.or.jp>, for the Debian project (but may be used by others).

Man Page							    2005-05-23								  CRMGR(1)
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