Sponsored Content
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

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

integer expression expected error

I'm a beginner so I might make beginner mistakes. I want to count the "#define" directives in every .C file I get the following errors: ./lab1.sh: line 5: ndef: command not found ./lab1.sh: line 6: #!/bin/sh for x in *. do ndef = 'grep -c \#define $x' if ; then ... (2 Replies)
Discussion started by: dark_knight
2 Replies

2. Shell Programming and Scripting

integer expression expected error crontab only

I created a bash script that ran fine for awhile on a nightly crontab but then started crashing with commands not found, so I added PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/home/homedir/scripts/myscriptdir export PATH and now I don't get those errors, but... (2 Replies)
Discussion started by: unclecameron
2 Replies

3. Fedora

"integer expression expected" error with drive space monitoring script

Hi guys, I am still kinda new to Linux. Script template I found on the net and adapted for our environment: #!/bin/sh #set -x ADMIN="admin@mydomain.com" ALERT=10 df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output; do #echo $output ... (2 Replies)
Discussion started by: wbdevilliers
2 Replies

4. Shell Programming and Scripting

Display Error [: : integer expression expected

i have lunix 5.4 i make script to tack the export from database 11g by oracle user the oracle sheel is /bin/bash when run this script display this error ./daily_xport_prod: line 36: the daily_xport_prod script #! /bin/sh # ORACLE_HOME=/u01/appl/oracle/product/11.2.0/db_1 export... (8 Replies)
Discussion started by: m_salah
8 Replies

5. Shell Programming and Scripting

New to shellscripting error: ./emailnotifications.sh: line 43: [: FH: integer expression expected

Hi , I'm a beginner in unix shell scripting need help in rectifying an error Source file :test.txt with Header ------ ----- Trailer ex: FH201010250030170000000000000000 abc def jke abr ded etf FE2 I was validating whether the header begin... (2 Replies)
Discussion started by: dudd9
2 Replies

6. Shell Programming and Scripting

if script error: integer expression expected

Hi, i am making a simple program with a optional -t as the 3rd parameter. Submit course assignment -t dir In the script, i wrote: #!/bin/bash echo "this is course: ${1}" echo "this is assignment #: ${2}" echo "late? : ${3}" if then echo "this is late" fi but this gives me a :... (3 Replies)
Discussion started by: leonmerc
3 Replies

7. Shell Programming and Scripting

Error: integer expression expected

root@server01 # df -h | grep /tmp | awk {'print $3}' 252M root@server01 # root@server01 # cat /usr/local/tmpchk.sh #!/bin/sh x=`df -h | grep /tmp | awk {'print $3}'` if ; then rm -fr /tmp/somefolder/ else echo "its small" (2 Replies)
Discussion started by: fed.linuxgossip
2 Replies

8. UNIX for Dummies Questions & Answers

Integer expression expected error in script

When i run the following code i get an error that says Integer expression expected! How do i fix this? #!/bin/bash if ;then echo "wrong" exit 1 fi if ;then for i in /dev;do if ;then echo $i ls -l fi (4 Replies)
Discussion started by: kotsos13
4 Replies

9. Shell Programming and Scripting

expr: An integer value was expected

Hi, I am trying to execute a simple script as below to compare a value from a file and copy that line based on a condition. while read line do code_check = `expr substr "$line" 6 1` if ; then echo "${line}" >> /temp/bill/push_updated.dat else echo "line ignored" fi done <... (8 Replies)
Discussion started by: ramkiran77
8 Replies

10. Shell Programming and Scripting

if condition error: integer expression expected

I am trying to run following condition with both variables having numeric values "1,2,3" if ;when i run it i get following error: $NEW_STATE: integer expression expected Please correct me where I'm doing wrong. I'm trying to check either New State is greater or Old state.... (0 Replies)
Discussion started by: kashif.live
0 Replies
exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
All times are GMT -4. The time now is 09:30 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy