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#!/bin/bash | |
#### Constants | |
USAGE="Usage: $(basename "$0") (-d/--database NAME) [GET/SET] [KEY-NAME] [VALUE] -- simple key-value storage implemented in bash" | |
DEFAULT_DB_NAME=0 | |
#### Functions | |
print_usage() { | |
echo "$USAGE" | |
} | |
set_database_name() { | |
if [ -z "$1" ] | |
then | |
print_usage | |
return 1 | |
fi | |
DB_NAME=$1 | |
} | |
get_value_by_key() { | |
if [ -z "$1" ] | |
then | |
print_usage | |
return 1 | |
fi | |
grep "^$1=" $DB_TEMPFILE | awk -F= '{print $2}' | |
} | |
set_value_at_key() { | |
if [ -z "$1" ] || [ -z "$2" ] | |
then | |
print_usage | |
return 1 | |
fi | |
grep -q "^\($1\s*=\s*\).*\$" "$DB_TEMPFILE" \ | |
&& sed -i "s/^\($1\s*=\s*\).*\$/\1$2/" "$DB_TEMPFILE" \ | |
|| echo "$1=$2" >> "$DB_TEMPFILE" \ | |
&& echo $2 | |
} | |
#### Main | |
case "$1" in | |
-db|--database) | |
set_database_name $2 | |
shift 2 | |
;; | |
*) | |
set_database_name $DEFAULT_DB_NAME | |
esac | |
DB_TEMPFILE=/tmp/kval/$DB_NAME.db | |
if [ ! -f $DB_TEMPFILE ] | |
then | |
mkdir -p /tmp/kval | |
touch $DB_TEMPFILE | |
fi | |
case "$1" in | |
GET) get_value_by_key "$2" | |
exit 0 | |
;; | |
SET) set_value_at_key "$2" "$3" | |
exit 0 | |
;; | |
*) print_usage | |
exit 1 | |
;; | |
esac |
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./kval.sh SET one 1
./kval.sh GET one
Additionally, you can explicitly specify database to be used:
./kval.sh -db colors SET red 0xFF0000