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Full Discussion: Getting error in bash script; expr $a + 1: integer expression expected
Top Forums Shell Programming and Scripting Getting error in bash script; expr $a + 1: integer expression expected Post 302859449 by Mallikgm on Thursday 3rd of October 2013 07:41:07 AM
Old 10-03-2013
[solved]Getting error in bash script; expr $a + 1: integer expression expected
Hi,
I am new to shell/bash script. I am trying to run below script
Code:
#!/bin/bash
a=0
b=10
if [ $a == $b ]
then
        echo "a is equal to be"
else
        echo "a is not equal to be"
fi
MAX=10
while [ "$a" -lt $b ]
do
        echo $a
        a='expr $a + 1'
done

it is giving below error:
Code:
-bash-3.2$ sh cal.sh
a is not equal to be
0
cal.sh: line 11: [: expr $a + 1: integer expression expected
-bash-3.2$

Could you please any one help to solve the problem.
thanks,
Mallik

---------- Post updated at 12:40 PM ---------- Previous update was at 12:12 PM ----------

I have solved above problem by using below code
declare -i a
declare -i b

Code:
#!/bin/bash
declare -i a
declare -i b
a=0
b=10
if [ $a == $b ]
then
 echo "a is equal to be"
else
 echo "a is not equal to be"
fi
MAX=10
while [ "$a" -lt $b ]
do
 echo $a
 a=" $a + 1 "
done

---------- Post updated at 12:41 PM ---------- Previous update was at 12:40 PM ----------

solved the above problem

Code:
 
declare -i a
declare -i b

 

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LEARN ABOUT DEBIAN

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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