Databases
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Postsdbo
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    <p>It can be done in bash itself if you have control of the configuration file format. You just need to source (".") the configuration file rather than subshell it. That ensures the variables are created in the context of the current shell (and continue to exist) rather than the subshell (where the variable disappear when the subshell exits).</p> <pre><code>$ cat config.data export parm_jdbc=jdbc:db2://box7.co.uk:5000/INSTA export parm_user=pax export parm_pwd=never_you_mind $ cat go.bash . config.data echo "JDBC string is " $parm_jdbc echo "Username is " $parm_user echo "Password is " $parm_pwd $ bash go.bash JDBC string is jdbc:db2://box7.co.uk:5000/INSTA Username is pax Password is never_you_mind </code></pre> <p>If your config file cannot be a shell script, you can just 'compile' it before executing thus (the compilation depends on your input format).</p> <pre><code>$ cat config.data parm_jdbc=jdbc:db2://box7.co.uk:5000/INSTA # JDBC URL parm_user=pax # user name parm_pwd=never_you_mind # password $ cat go.bash cat config.data | sed 's/#.*$//' | sed 's/[ \t]*$//' | sed 's/^[ \t]*//' | grep -v '^$' | sed 's/^/export ' &gt;config.data-compiled . config.data-compiled echo "JDBC string is " $parm_jdbc echo "Username is " $parm_user echo "Password is " $parm_pwd $ bash go.bash JDBC string is jdbc:db2://box7.co.uk:5000/INSTA Username is pax Password is never_you_mind </code></pre> <p>In your specific case, you could use something like:</p> <pre><code>$ cat config.data export p_p1=val1 export p_p2=val2 $ cat go.bash . ./config.data echo "select * from dbtable where p1 = '$p_p1' and p2 like '$p_p2%' order by p1" $ bash go.bash select * from dbtable where p1 = 'val1' and p2 like 'val2%' order by p1 </code></pre> <p>Then pipe the output of go.bash into MySQL and voila, hopefully you won't destroy your database :-).</p>
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    1. POHow to replace ${} placeholders in a text file?
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    1. USpaxdiablo
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      1. VTUpMod
    1. COYou don't have to export the variables from the config.data file; it is sufficient just to set them. You also don't seem to be reading the template file at any point. Or, perhaps, the template file is modified and contains the 'echo' operations...or am I missing something?
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      1. USJonathan Leffler
    2. COGood point on the exports, I do that by default so that they're available to subshells and it causes no harm since they die when go exits. The 'template' file is the script itself with it's echo statements. There's no need to introduce a third file - it's basically a mailmerge-type operation.
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