从文件中调用变量

Question

I need to retrieve variables that have been stored in a file. I am capturing the variable for an install of prostgress and some other programs. Here is the script that I am using to create the variables.sh file at the beginning of the install script.

#!/bin/bash # init

function pause(){ read -p "$*" }

echo " Enter db user name " echo " "

read dbuser

echo " "
echo " Enter name of database  "
echo " "

read dbname

echo " "
echo " Enter db password "
echo "  "

read pws

echo " "
echo " Enter Port Number "
echo " "

read port

echo " "
echo " Enter URL i.e. my.hospital.com:8191 or 78.12.156.234:8191 "
echo " "

read url

cat > variables.dat << EOF

dbuser=$dbuser
dbname=$dbname
pws=$pws
port=$port
url=$url

EOF

if [ -f variables.sh ];

   then 
     echo " Data stored ready for next phase "

   else 

     echo " Data not stored - exit program start again "
     echo " "
     pause " Press [CTL] [Z] to exit the program now "

fi

chmod +x variables.sh

exit

During the execution of the other modules that I have written. I want to be able to open or call the variables file and pass variables to the executing script. So my pac-install.sh will include the variables.sh file and pass it's contents to the pac-install.sh script and be able to use the dbuser=$dbuser. I hope this is more concrete.

Thanks for any help.

Answer 1

Perhaps the bash source command is what you are looking for?

If the file variables.sh contains the lines

dbuser="the user"
dbname="the name"
...

then you can execute

source variables.sh

from a bash shell script to read and execute the commands from this file. This will assign the values to the shell variables $dbuser , $dbname etc.

Note that you should enclose the values in quotation marks if they contain spaces.

Example how to read back the variables from the file:

#!/bin/bash

source variables.sh
echo "dbuser=$dbuser"
echo "dbname=$dbname"