Using the env variable of unix in a procedure call

hi,
how can i use the environment varible of unix in a oracle procedure call ?
I am working woth shell scripts and it hold some value into a variable and that varible value I want to pass into a oracle procedure.
i'm sending the sample code and please let me know the solution for this as early as possible.
actual_file_name=`head -1 temp | tail -1`
$ORA_BIN_HOME/sqlplus $USER $PASSWD@$TNS
exec procedure($actual_file_name);
if i write like above it is not supporting and I tried in so many ways. but no use.
pls help me.
suresh.K

See one possible solution using SQL*Plus command line:
Re: accessing unix environment variable in oracle procedures

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Author: [email protected]
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