Login or Register to Ask a Question and Join Our Community


Ubuntu

Displayin error in executing the script

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Ubuntu Displayin error in executing the script
# 1  
Old 06-26-2010
Displayin error in executing the script
Code:
echo "enter your number"
read x
while [ "$x" -le 10]
do
  x = `expr $x \* 2`
  echo $x
done

I am giving i/p for x as 2 mt

But it throws syntax error on 'expr' st

I am expecting an output

Code:
2
4
6
8

Last edited by Scott; 06-26-2010 at 07:05 AM.. Reason: Code tags
# 2  
Old 06-26-2010
What works (even though your math fails me, sorry ...):

Code:
#!/bin/bash

echo -n "Number: " ; read X
while [ $X -le 10 ]
do
  X=$( expr $X \* 2 )
  # X=$(( $X * 2 ))
  echo "$X"
done

exit 0
# finis

# 3  
Old 06-26-2010
Quote:
Originally Posted by sundaresanv
Code:
echo "enter your number"
read x
while [ "$x" -lt 10 ] # added whitespace between '10' and ']', replaced '-le' with '-lt'
do
 x=`expr $x + 2` # replaced '\*' with '+', removed whitespaces before and after '='
echo $x
done

I am giving i/p for x as 2 mt

But it throws syntax error on 'expr' st

I am expecting an output

2
4
6
8
...and it should work with straight numbers.
Last edited by pseudocoder; 06-26-2010 at 06:25 AM..
# 4  
Old 06-30-2010
It's working for me ... only problem was of space/blanks.
# vi 1.sh
# chmod +x 1.sh
# cat 1.sh
echo "enter your number"
read x
while [ "$x" -le 10 ]
do
x=`expr $x \* 2`
echo $x
done

# ./1.sh
enter your number
2
4
8
16

Hope this helps.
~Naresh Bhalala
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Red Hat

Error when executing script

Hi, I wrote this script to test if the output for DIR1 and DIR2 comes out as I want : #!/bin/bash DAY=$(date +%d) MONTH=$(date +%b) YEAR=$(date +%Y) DIR1=$($MONTH$YEAR"_Blast_BC01") DIR2=$($MONTH$YEAR"_Blast_BC15") echo $DIR1 echo $DIR2 This is the output I want for echo $DIR1 ... (12 Replies)
Discussion started by: anaigini45
12 Replies

2. UNIX for Dummies Questions & Answers

Error executing the script

I have the following script test.sh owned by dwdev account and group dwdev, the permissions on the script are as follows. -rw-r-x--- 1 dwdev dwdev 279 Sep 17 13:19 test.sh Groups: cat /etc/group | grep dwdev dwdev:x:704:dwdev dwgroup:x:725:dwdev writers:x:726:dwdev User: cat /etc/passwd |... (3 Replies)
Discussion started by: Ariean
3 Replies

3. Linux

Libssh2 error while executing script

hi all, i am getting libssh2 error while executing script in RHEL 6, when i locate that file its not there below is the ouput of this # locate libssh2_agent_init # cat /etc/issue Red Hat Enterprise Linux Server release 6.1 (Santiago) Kernel \r on an \m how do i resolve this issue, i... (1 Reply)
Discussion started by: muzaffar.k
1 Replies

4. Shell Programming and Scripting

Error executing script

Please delete de thread. Thanks. (10 Replies)
Discussion started by: Rodrih92
10 Replies

5. Shell Programming and Scripting

getting the error 'not found' while executing the script

Hi, I am not able to figure out what the problem is: getting the following error sqltst.sh: 1: not found here is the script #!/bin/sh . /home/dev1/.profile . /home/dev1/.infenv `sqlplus -s $REPDB_LOGON << EOF SET SERVEROUT ON SET FEEDBACK OFF SET HEADING OFF SET TRIMSPOOL... (4 Replies)
Discussion started by: svajhala
4 Replies

6. Shell Programming and Scripting

Error while executing a script

Hi Please assist. Im getting an error while execuing the script name d "cdsnd.basel.cd_new " as siiadm user. Thanks. siiadm> ls -l total 64 -rwxr-xr-x 1 siiadm sboadm 1004 Sep 17 2008 cdsnd.basel.cd -rwxr-xr-x 1 siiadm sapsys 998 Nov 16 09:14 cdsnd.basel.cd_new... (1 Reply)
Discussion started by: samsungsamsung
1 Replies

7. UNIX for Dummies Questions & Answers

Error Executing the script.

Hi , I m getting an error after executing the script. My script. Script is used to find out the date on 8 different machines(mentioned in SERVERNAMES file). I have added public key to avoid ssh password and ssh without password working fine. #!/bin/sh fn_VMFind() { Date=`ssh -t... (5 Replies)
Discussion started by: pinga123
5 Replies

8. Shell Programming and Scripting

Error while executing the below script

I am executing the below in telnet #!/usr/bin/ksh File1=simple.txt # The file to check LogFile=simple.log # The log file DelayMax=30 # Timeout delay Tolerance=2 # BEGIN ############################## while true do StampNow=$(date +%s)/60 # stamp in minutes ... (3 Replies)
Discussion started by: chinniforu2003
3 Replies

9. Shell Programming and Scripting

Error while executing a script

My script is as below : #!/bin/sh for line in `cat Results.txt` do FEILD1=`echo $line |awk -F"|" '{print $1}'` FEILD2=`echo $line |awk -F"|" '{print $2}'` FEILD3=`echo $line |awk -F"|" '{print $3}'` FEILD4=`echo $line |awk -F"|" '{print $4}'` echo "$FEILD1 $FIELD2 $FIELD3 $FIELD4" done ... (15 Replies)
Discussion started by: shwetainnani
15 Replies

10. Shell Programming and Scripting

error while executing the script

Hello I am executing the following script nawk 'NR == 1 || substr($0,63,5) ~ /H... / && \ _++ == 2 { fn && close(fn); fn = "part_" ++c; _ = 1 } { print > fn }' sample.dat When i execute as it is it is executing fine. but when i execute the whole script as a single line like below ... (2 Replies)
Discussion started by: dsdev_123
2 Replies
Login or Register to Ask a Question