сценарий Bash
echo '#!bin/bash' > filename
# works with and without extention, if you want extention do filename.sh
chmod +x filename
Jos
echo '#!bin/bash' > filename
# works with and without extention, if you want extention do filename.sh
chmod +x filename$ [[ 45 =~ [0-9]+ ]] && echo "45 contains digits"
45 contains digits
$ [[ "hello" =~ [0-9]+ ]] && echo "hello doesnt contains digits"
$ [[ "hello" =~ [a-z]+ ]] && echo "hello contains alphabets"
hello contains alphabets
# The bash function below utilizes the CLI tool psql to vacuum analyze tables
# in a single schema which can be identified by either passing the name of
# the schema as the first parameter to the function
# or setting the environment variable PG_SCHEMA:
#
vacuum_analyze_schema() {
# vacuum analyze only the tables in the specified schema
# postgres info can be supplied by either passing it as parameters to this
# function, setting environment variables or a combination of the two
local pg_schema="${1:-${PG_SCHEMA}}"
local pg_db="${2:-${PG_DB}}"
local pg_user="${3:-${PG_USER}}"
local pg_host="${4:-${PG_HOST}}"
echo "Vacuuming schema \`${pg_schema}\`:"
# extract schema table names from psql output and put them in a bash array
local psql_tbls="\dt ${pg_schema}.*"
local sed_str="s/${pg_schema}\s+\|\s+(\w+)\s+\|.*/\1/p"
local table_names=$( echo "${psql_tbls}" | psql -d "${pg_db}" -U "${pg_user}" -h "${pg_host}" | sed -nr "${sed_str}" )
local tables_array=( $( echo "${table_names}" | tr '\n' ' ' ) )
# loop through the table names creating and executing a vacuum
# command for each one
for t in "${tables_array[@]}"; do
echo "doing table \`${t}\`..."
psql -d "${pg_db}" -U "${pg_user}" -h "${pg_host}" \
-c "VACUUM (ANALYZE) ${pg_schema}.${t};"
done
}