How to run a command inside shell script only once

Question

I have written bash shell script, which will download artifact and untar it and copy it to the destination folder. After that it does some more steps. and i am running this script from mco command which will execute in many hosts parallely. but i want restrict one perticular command to execute only once. how do i do that. except that command all other should execute in all host

myscript.sh :

if [ "$#" -eq 2 ]; then   
    Name=$1
    version=$2
    tarname=$Name"-"$version-SNAPSHOT.tar
    SNAPSHOT=$Name-$version-SNAPSHOT
    if [[ ! -e "/<path>/$tarname" && "/<path>/$SNAPSHOT" ]]; then

       do something  // this command i want to execute only once or only in one host. 
    fi

I execute this script like this :

mco shellcmd '/path/myscript.sh name version' -I /host-10[012345]/

this script executes in 50 host at a time but one particulate command should execute in only one host/one time.

how do we do this.

Thanks,

Cyrus · Accepted Answer · 2015-08-19 23:19:21Z

1

Check the hostname:

if [[ "$HOSTNAME" == "foobar" ]]; then
  echo "execute command here"
fi

edited Aug 19, 2015 at 23:19

answered Aug 19, 2015 at 23:08

Cyrus

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