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  1. or download this
            warn "Launching [[$cmd]]";
    
  2. or download this
    echo $h
    echo $k
    sed -i "s#.*$h#$k#gI" test.txt
    
  3. or download this
    sed -i "s#.*HOSTA#ssh-rsa AAAAB3NzaC1yc2 root@HOSTA#gI" /tmp/test.txt