Shell / Korn script - set variable depending on hostname in list

Question

I need to write a korn script that depending on the host the script is running on, will set a deployment directory (so say 5 hosts deploy the software to directory one and five other hosts deploy to directory two).

How could I do this - I wanted to avoid an if condition for every host like below

IF [hostname = host1] then $INSTALL_DIR=Dir1
ELSE IF [hostname = host2] then $INSTALL_DIR=Dir1

and would prefer to have a list of say Directory1Hosts and Directory2Hosts which contains all the hosts valid for each directory, and then I would just check if the host the script is running on is in my Directory1Hosts or Directory2Hosts (so only two IF conditions instead of 10).

Thanks for your help - have been struggling to find how to do effectively a contains clause.

chepner · Accepted Answer · 2017-05-04 15:00:20Z

1

Use a case statement:

case $hostname in
   host1) INSTALL_DIR=DIR1 ;;
   host2) INSTALL_DIR=DIR2 ;;
esac

or use an associative array

install_dirs=([host1]=DIR1 [host2]=DIR2)

...

INSTALL_DIR=${install_dirs[$hostname]}

answered May 4, 2017 at 15:00

chepner

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1 Comment

ULick Over a year ago

case allows patterns like host[0-5]) INST...

Walter A · Accepted Answer · 2017-05-06 21:17:18Z

0

When you want to have configuration and code apart, you can make a config directory: one file with hosts for each install dir.

# cat installdirs/Dir1
host1
host2

With these files your code can be

INSTALL_DIR=$(grep -Flx "${hostname}" installdirs/* | cut -d"/" -f2)

answered May 6, 2017 at 21:17

Walter A

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