When I try to run "yum -y update" from a Bash script it doesn't work.

Here is what the script looks like.

echo "--> Updating CentOS System"
yum -y update

I run the script with this command.

bash script.sh

I get the following output.

Loaded plugins: fastestmirror, refresh-packagekit, security
. Please use /usr/bin/yum --help.

CentOS 6 FINAL Installed via text prompts. I login as root from the text prompt then startx to get into the gui desktop.

But when I run the same command directly in the terminal it works?

I've googled around but not sure if I'm googling the correct terms.

Thanks for your help.

  • chmod u+x script.sh give permission n try or you may run these commands as root user.
    – Shailesh
    Oct 10, 2013 at 8:55
  • Your hashbang (!#/usr/bin/) is incorrect--it should be something like #!/usr/bin/bash--, but is not relevant to your error since you explicitly run the script with bash.
    – chepner
    Oct 10, 2013 at 15:13
  • @chepner - Made the change. Getting a weird "Unexpected token" error but the code looks correct. If I run the same script with the bash command it acctualy starts the script without any error. But YUM commands don't seem to work.
    – cph
    Oct 14, 2013 at 21:16
  • 1
    @Shailesh - Made the changes requested still have issue.
    – cph
    Oct 14, 2013 at 21:18
  • #! /bin/bash put this line in your script and remove !#/usr/bin/
    – Shailesh
    Oct 22, 2013 at 8:33

1 Answer 1


Not sure why your script does not work, but my version worked fine. (I suspect it might be the first line):

#! /bin/bash

echo "--> Updating CentOS System"
yum -y update

Remember to chmod 755 the file, and you can just run it with the file name, no need to prepend it with "bash".

I do note that when I tried to reproduce your problem I couldn't (even though your first line is incorrect the script still worked for me). I wonder if there might have been a hidden typo in the key shell line ? Maybe try deleting it and re-adding it.

  • Did above still seem to be having an issue. Made the change as well. Not sure what's going on here. I'll keep you posted. Thanks for you help.
    – cph
    Oct 14, 2013 at 21:33

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