Put char with sed

put char on position X with sed
 
put space on position 5
echo 1234567 | sed 's/./& /5'

put . on position 5
echo 1234567 | sed 's/./&./5'
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Oracle linux security updates

  - List available security packages: dnf updateinfo list security   - List installed security updates: dnf updateinfo list --installed --se...

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