Reading parameter keys / values ​​from file to shell script

Question

I have my script working almost. The purpose of this is to take certain values ​​from the file, and then populate these valeus in the shell script at runtime.

Please see what I have here ...

First file: ab.sh

#!/bin/bash
USER_TYPE=$1 #IDENTIFY USER TYPE TYPE1,TYPE2,TYPE3,TYPE4
USERNAME=$2
PERMISSION_TYPE=$3 #IDENTIFY PERMISSION TYPE SELECT,UPDATE,DELETE,INSERT
TARGET_USER=$4
TARGET_TABLE=$5

if [ $USER_TYPE == 'TYPE1' ]
        then
cat Parameters.conf |while read USERNAME
do
sqlplus / as sysdba <<  E00
CREATE USER ${USERNAME}
DEFAULT TABLESPACE USERS
TEMPORARY TABLESPACE TEMP
ACCOUNT UNLOCK;
ALTER USER ${USERNAME} DEFAULT ROLE ALL;
GRANT CREATE SESSION TO ${USERNAME};
GRANT CONNECT TO ${USERNAME};
exit
E00
done

cat p.conf |while read PERMISSION_TYPE TARGET_SCHEMA TARGET_TABLE USERNAME
do
sqlplus / as sysdba > /home/o/output/output.log << E01
GRANT ${PERMISSION_TYPE} ON ${TARGET_USER}.${TARGET_TABLE} TO ${USERNAME};
E01
done
fi

This is the Parameters.conf file where the values ​​are defined and should appear ...

Parameters.conf

USER_TYPE TYPE1
USERNAME NEWUSER
PERMISSION_TYPE SELECT,UPDATE
TARGET_USER TESTUSER
TARGET_TABLE ABC

Answer 1

First choice: associative array

Support declare -Arequires bash 4.0 or later; See below for other options.

#!/bin/bash

# first, read your key/value pairs into shell variables
declare -A v=( )
while read -r var value; do
  v[$var]=$value
done < Parameters.conf

# second, perform a command that depends on them
sqlplus / as sysdba <<  E00
CREATE USER ${v[USERNAME]}
DEFAULT TABLESPACE USERS
TEMPORARY TABLESPACE TEMP
ACCOUNT UNLOCK;
ALTER USER ${v[USERNAME]} DEFAULT ROLE ALL;
GRANT CREATE SESSION TO ${v[USERNAME]};
GRANT CONNECT TO ${v[USERNAME]};
exit
E00

sqlplus / as sysdba > /home/o/output/output.log << E01
GRANT ${v[PERMISSION_TYPE]} ON ${v[TARGET_USER]}.${v[TARGET_TABLE]} TO ${v[USERNAME]};
E01

---

Key points:

• , , BashFAQ # 6; .
• while read key value; do ...; done <input, cat input | while read key value; do ...; done, BashFAQ # 24.
• sqlplus , . , ( ) sqlplus, sqlplus.
• , , , , PATH LD_PRELOAD.

---

:

#!/bin/bash

while read -r var value; do
  printf -v "v_$var" %s "$value"
done <Parameters.conf

# second, perform a command that depends on them
sqlplus / as sysdba <<  E00
CREATE USER ${v_USERNAME}
DEFAULT TABLESPACE USERS
TEMPORARY TABLESPACE TEMP
ACCOUNT UNLOCK;
ALTER USER ${v_USERNAME} DEFAULT ROLE ALL;
GRANT CREATE SESSION TO ${v_USERNAME};
GRANT CONNECT TO ${v_USERNAME};
exit
E00

sqlplus / as sysdba > /home/o/output/output.log << E01
GRANT ${v_PERMISSION_TYPE} ON ${v_TARGET_USER}.${v_TARGET_TABLE} TO ${v_USERNAME};
E01