Fixing partition table in linux with sfdisk

Manipulating partition tables on MS-DOS labelled hard disk (the most common type as of this writing) is an extemely important skill to have as a System Administrator. If one or more partitions gets deleted or modified in an unintentional way, it is imperative that one know how to restore or modify the partitions to rectify the problem.

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PAX: the universal UNIX and GNU Linux archiver

pax, which means peace in Latin, combines the best of both cpio and tar, which are found in nearly all modern GNU/Linux distributions. However, it appears as though it hasn’t been updated in several years!

Benefits include:

  • can use ‘find’ to get list of files, which is then piped through to pax (cpio style)
  • can read and write many archive formats, including ustar (default), cpio, and many others
  • can do copy-pass mode (copy entire directory tree to another location)
  • can do gzip compression on the fly (tar style)

man pax will show you more example

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Cron Crontab Schedule

*    *    *    *    *  command to be executed
┬    ┬    ┬    ┬    ┬
│    │    │    │    │
│    │    │    │    │
│    │    │    │    └───── day of week (0 - 7) (Sunday=0 or 7)
│    │    │    └────────── month (1 - 12)
│    │    └─────────────── day of month (1 - 31)
│    └──────────────────── hour (0 - 23)
└───────────────────────── min (0 - 59)