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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

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
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