basic bash script

basic.sh

#!/bin/sh

this_folder="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
if [ -z "$this_folder" ]; then
  this_folder=$(dirname $(readlink -f $0))
fi
parent_folder=$(dirname $this_folder)

# include file
if [ ! -f "$this_folder/variables.inc" ]; then
  warn "we DON'T have a 'variables.inc' file"
else
  . "$this_folder/variables.inc"
fi

if [ ! -f "$this_folder/secrets.inc" ]; then
  warn "we DON'T have a 'secrets.inc' file"
else
  . "$this_folder/secrets.inc"
fi

if [ -f "$this_folder/commons.inc" ]; then
  . "$this_folder/commons.inc"
else
  warn "we DON'T have a 'commons.inc' file"
fi

# parameter check
usage()
{
        cat <<EOM
        usage:
        $(basename $0) <parameter>
EOM
        exit 1
}

[ -z $1 ] && { usage; }

# file existence check
if [ ! -e $file ]
then
	echo "!!! no file [$file] !!! ...leaving."
	return -1
fi

# outcome check
if [ ! "$?" -eq "0" ] ; then echo "not ok"; return -1; fi


# --- lib include file example ---
# usage:
#    . $this_folder/lib_include.sh
#
#    table=test
#    result=$(createTable "$table")
#    echo $result
createTable()
{
    local __r=0
    local __table=$1   
    aws dynamodb describe-table --output text --table-name $__table
    if [ "$?" -eq "0" ]
    then
        echo "------- ...table $__table is still there, try to delete it first! ... leaving!"
        __r=1
    else
        aws dynamodb create-table --table-name $__table --attribute-definitions AttributeName=id,AttributeType=S --key-schema AttributeName=id,KeyType=HASH --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5
        if [ ! "$?" -eq "0" ]
        then 
            echo "------- ! could not create table $__table !...leaving."
            __r=1
        else 
            echo "------- created table $__table"
        fi
    fi
    echo "$__r"
}


# --- functions outcome example ---
apiStart()
{
  return 1
}

apiStart
if [ ! "$?" -eq "0" ] ; then
  echo "bad" && exit 1
else
  echo "ok"
fi

# --- tests ---

__s="UNKNOWN"
if [ "$__s" -ne "" ]; then echo "ok"; fi        ### bash: [: UNKNOWN: integer expression expected
if [ "$__s" != "" ]; then echo "ok"; fi         ### ok
if [ ! -z "$__s" ]; then echo "ok"; fi          ### ok
if [ "$__s" == "UNKNOWN" ]; then echo "ok"; fi  ### ok
if [ "$__s" -eq "UNKNOWN" ]; then echo "ok"; fi ### bash: [: UNKNOWN: integer expression expected
__s="FF"
if [ "$__s" -ne "" ]; then echo "ok"; fi        ### bash: [: FF: integer expression expected     
if [ "$__s" != "" ]; then echo "ok"; fi         ### ok
if [ ! -z "$__s" ]; then echo "ok"; fi          ### ok    
if [ "$__s" != "UNKNOWN" ]; then echo "ok"; fi  ### ok
if [ "$__s" -ne "UNKNOWN" ]; then echo "ok"; fi ### bash: [: FF: integer expression expected
__s=
if [ "$__s" -eq "" ]; then echo "ok"; fi        ### bash: [: : integer expression expected
if [ "$__s" != "" ]; then echo "ok"; fi         ###
if [ "$__s" == "" ]; then echo "ok"; fi         ### ok
if [ ! -z "$__s" ]; then echo "ok"; fi          ###
if [ -z "$__s" ]; then echo "ok"; fi            ### ok
if [ "$__s" != "UNKNOWN" ]; then echo "ok"; fi  ### ok
if [ "$__s" -ne "UNKNOWN" ]; then echo "ok"; fi ### bash: [: : integer expression expected

#  --- param case control structure ---
# ...
undeployApi()
{
  echo "[undeployApi|in]"



  echo "[undeployApi|out]"
}

usage()
{
  cat <<EOM
  usage:
  $(basename $0) [state|loader|api] [deploy|undeploy]
EOM
  exit 1
}

case "$1" in
        state)
            case "$2" in
                    deploy)
                      deployBase
                      ;;
                    undeploy)
                      undeployBase
                      ;;
                    *)
                      usage
            esac
            ;;
        api)
            case "$2" in
                    deploy)
                      deployApi
                      ;;
                    undeploy)
                      undeployApi
                      ;;
                    *)
                      usage
            esac
            ;;
        *)
            usage
esac


....
  install-chart)
    [ "$2" != "admin" ] && [ "$2" != "exch-rate" ] && [ "$2" != "gcss-feed" ] && [ "$2" != "pricing" ] && [ "$2" != "pricing-branch1" ] && [ "$2" != "public" ] && [ "$2" != "quote" ] && [ "$2" != "scheduler" ] && { usage; }
    service=$2
    # assume default values
    tag=latest
    release=$service
    shift && shift
    while [[ "$#" -gt 0 ]]; do
        echo "1: $1"
        case $1 in
            -i|--image-tag)
              [ -z "$2" ] && { usage; }
              tag="$2";
              shift
              ;;
            -n|--name)
              [ -z "$2" ] && { usage; }
              release="$2"
              shift
              ;;
            *)
              usage
              ;;
        esac
        shift
    done
    installChart "$service" "$tag" "$release"
    ;;