CODEWITHSUNDEEP
linuxbash
Samuel Santiago
Samuel Santiago

Reputation: 47

how teste against a list using IF in bash

I have this part of a code, and I cant figure out how to implemente what I want.

hostname_negate="SERVER03"
CLUSTER="SERVER01 SERVER02 SERVER03 SERVER04 SERVER05 SERVER06 SERVER07 SERVER08 SERVER09 SERVER10"
for SERVIDOR in $CLUSTER
  do
  If [ $SERVIDOR == $hostname_negate ]; then
  ===SOME ADMINISTRATIVE STUFF HERE ===
  else
  ===SOME ADMINISTRATIVE STUFF HERE===
  fi
  done

This work if only one server is in hostname_negate... bute if I have 100 servers and 10 are in hostname_negate.... how I implement this to work?

Upvotes: 0

Views: 63

Answers (2)

keithpjolley
keithpjolley

Reputation: 2263

In the long run you'll probably be better served having the lists in files instead of strings.

CLUSTER="SERVER01 SERVER02 SERVER03 SERVER04 SERVER05 SERVER06 SERVER07 SERVER08 SERVER09 SERVER10"
NEGATES="SERVER03 SERVER07 BROKENSERVER01"

# Convert from string to list in a file.
# Generally better to have these in files instead of strings.
echo "$CLUSTER" | tr ' ' '\n' > /tmp/cluster.$$
echo "$NEGATES" | tr ' ' '\n' > /tmp/negates.$$

for server in $(comm -12 <(sort /tmp/cluster.$$) <(sort /tmp/negates.$$))
do 
    echo "In both lists: $server"
done

for server in $(comm -23 <(sort /tmp/cluster.$$) <(sort /tmp/negates.$$))
do
    echo "Unique to CLUSTER: $server"
done

for server in $(comm -13 <(sort /tmp/cluster.$$) <(sort /tmp/negates.$$))
do
    echo "Unique to NEGATES: $server"
done

# Clean up.
rm /tmp/cluster.$$ /tmp/negates.$$

Results in:

in both lists: SERVER03
in both lists: SERVER07
unique to CLUSTER: SERVER01
unique to CLUSTER: SERVER02
unique to CLUSTER: SERVER04
unique to CLUSTER: SERVER05
unique to CLUSTER: SERVER06
unique to CLUSTER: SERVER08
unique to CLUSTER: SERVER09
unique to CLUSTER: SERVER10
unique to NEGATES: BROKENSERVER01

Upvotes: 1

Jetchisel
Jetchisel

Reputation: 7791

A loop from both the lists, but convert both of them to an array first, something like.

#!/usr/bin/env bash

hostname_negate=(
  "SERVER03" "SERVER07" "SERVER10"
)

cluster=(
  "SERVER01" "SERVER02" "SERVER03" "SERVER04" "SERVER05" "SERVER06" "SERVER07" "SERVER08" "SERVER09" "SERVER10"
)

for servidor in "${cluster[@]}" ; do
  for host_name in "${hostname_negate[@]}"; do
    if [[ $servidor == $host_name ]]; then
      printf '%s %s is a match!\n' "$servidor" "$host_name"
    else
      printf '%s %s does not match!\n' "$servidor" "$host_name"
    fi
  done
done

Or if you're just trying to check if hostname_negate is in cluster, then

#!/usr/bin/env bash

hostname_negate=(
  "SERVER03" "SERVER07" "SERVER10" "SERVER99"
)

cluster=(
  "SERVER01" "SERVER02" "SERVER03"
  "SERVER04" "SERVER05" "SERVER06"
  "SERVER07" "SERVER08" "SERVER09"
  "SERVER10" "SERVER11" "SERVER12"
  "SERVER13" "SERVER14" "SERVER15"
  "SERVER16" "SERVER17" "SERVER18"
  "SERVER19" "SERVER20" "SERVER21"
  "SERVER22" "SERVER23" "SERVER24"
)

cluster_pattern=$(IFS='|'; printf '%s' "@(${cluster[*]})")

for host_name in "${hostname_negate[@]}"; do
  if [[  $host_name == $cluster_pattern ]]; then
    printf '%s is in %s!\n'  "$host_name" $cluster_pattern
  else
    printf '%s is not in %s!\n'  "$host_name" $cluster_pattern
  fi
done

Just change the printf's to the Administrative stuff that you wanted to do.

Upvotes: 3

Related Questions