how to rename a table in oracle (sqlplus)

alter table
   table_name
rename to
   new_table_name;

how to change cpan mirror list

$ cpan
cpan) o conf init

This will bring you to reconfigure everything.

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how to set default schema in sqlplus - oracle

SQL> alter session set current_schema=some_schema_name;

how to mount ntfs file system for read/write in linux

# ntfs-3g /dev/hda1 /mnt/hda1

how to mount macosx partition from linux

# mount -t hfsplus /dev/usb-sda2 /mnt/usb-sda2

But if you can't write into the mounted partition, you might have to disable journaling on this hfs partition by executing this command from your macosx on this drive:

# /usr/sbin/diskutil disableJournal /Volumes/mac-backup

how to search and replace string with confirmation in vi

:s/OLD/NEW/gc

Please notice the extra "c" for "confirmation".

how to combine several pdf files into one pdf file

gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=combinedpdf.pdf -dBATCH 01.pdf 02.pdf 03.pdf .......

gs is GhostScript.