Nohup Command

UNIX for Beginners Q & A UNIX for Dummies Questions & Answers
1

Hello All,

I am newbie to unix.I am trying to use NOHUP command in shell script it works fine with only "nohup test.sh 10 &" and "/opt/user/nohup test.sh 10 &" gives an error saying "ksh: /opt/user/nohup : not found".

Can anybody please guide me to make it work.

Thanks
Blazix

2

try finding where is your nohup location is and what is the PATH
you have for nohup.

try :

which nohup # will give the nohup you are using in the first instance.

# /opt/user/nohup may not be correct location.

3

The nohup is the current working directory if given at the command line.
If I use in the shell script it is the home directory of the user ie., /opt/user is the default home dir for the user when he logins in.

I have hardcoded the path and also used as a variable but it still remains the same

4

Please post your OS and version. Also post the output of
$ which nohup

Your post isn't making sense and with this information, maybe someone will be able to assist you. Thanks.

5

#!/bin/ksh

# This script calls the weblogic start script if the file exist

if [ -f /opt/user/scripts/test.sh ]
then
echo "testing script"
su - username -c "nohup /opt/user/scripts/test.sh &"
exit $?
fi

#!/bin/ksh

# This script calls the test script if the file exist

if [ -f /opt/user/scripts/test.sh ]
then
HOME="/opt/user"
echo "testing script"
su - username -c "${HOME}/nohup /opt/user/scripts/test.sh &" // Error ksh:/opt/user/nohup:not found
exit $?
fi

I want the second script to be working.

Thanks

6

Again, please post your OS and version, and the output of the following command:
$ which nohup

This will assist in getting you a answer. Since you seem to insist that /opt/user/nohup is a file on your server, please also post the output of these commands:
$ file /opt/user/nohup
$ ls -l /opt/user/nohup

I have reason to believe you are incorrect in using ${HOME}/nohup in the second script - I'm not sure why there would be a script or executable called nohup as this would be against most rules of programming (naming a script the same as a command). The first script seems to have the syntax correct:

su - username -c "nohup /opt/user/scripts/test.sh &"

since running a nohup command is done like that, and added to su - user would be correct. See the man page for su and nohup.

7

please post your OS and version:HP-UX B.11.11

$ which nohup :/usr/bin/nohup //output

$ file /opt/user/nohup : cannot open
$ ls -l /opt/user/nohup : not found

Since the nohup.out is created when the command is executed hence the file does not exist for the above 2 commands

If nohup.out is not writable in the current directory, output is redirected to $HOME/nohup.out; otherwise, nohup fails.

I have reason to believe you are incorrect in using ${HOME}/nohup in the second script If nohup.out is not writable in the current directory, output is redirected to $HOME/nohup.out; otherwise, nohup fails.

I need the nohup to be written at the /usr/bin/.I am not whether I am clear or not.

8

so , modify your second script to make it successfully run :


#!/bin/ksh

# This script calls the test script if the file exist

if [ -f /opt/user/scripts/test.sh ]
then
HOME="/opt/user"
echo "testing script"
su - username -c "/usr/bin/nohup  /opt/user/scripts/test.sh &" 
exit $?
fi

also ....

remove // in your script. use # if you want to put it as comments/remarks
I'm not sure whether you have put it purposefully.

9

Bhargav,

su - username -c "/usr/bin/nohup /opt/user/scripts/test.sh &"

This is the exactly code which I used but the script is giving the errors.
Hence, I posted the query.

10

No, the code you posted was

su - username -c "${HOME}/nohup /opt/user/scripts/test.sh &

Seeing as "username"'s $HOME is (apparently) /opt/user - and nohup doesn't exist there, you are receiving the error that nohup can't be found.

Change that line of code to the line that bhargav has suggested (which was formulated from your earlier posting of the output of "which nohup") and your error should vanish! :slight_smile:

Cheers
ZB