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it may sound weird but can u try this


sqlplus -s "${ID}" <<EOF
select sysdate from dual;
exit;
EOF

use find command to search from root /:

find / -type f -name "abc.log"

ERROR: ORA-12170: TNS:Connect timeout occurred SP2-0306: Invalid option. Usage: CONN[ECT] [logon] [AS {SYSDBA|SYSOPER}] where <logon> ::= <username>[/<password>][@<connect_identifier>] | / ERROR:...

ID="userid/password@sid"
or
usr=userid
pswd=password
tns=sid

sqlplus -s ${usr}/${pswd}@${tns}

# or

export ID=userid/password@sid

if ur file is sorted no need to sort it.
uniq -c <file_name>

in which language u want to create application?

vi $(ls -t abc*.log | head -1)

try basename

u can exclude "_" by grep -v "_" in pipe.
like grep "apple.txt" file | grep -v "_"