Daily Archives: 17-Apr-2014

unix

AIX cron jobs format

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While you need to let server schedule something you can use built-in conn jobs to complete this requirement easily. Below just a sample cron jobs format explanation.

syntax:

minute hour day_of_month month weekday command
minute 0 through 59
hour 0 through 23
day_of_month 1 through 31
month 1 through 12
weekday 0 through 6 for Sunday through Saturday
command a shell command

sample:

30 * * * * do_every_half_an_hour.sh
* 1 * * * do_at_1am_daily.sh
* * 1 * * do_at_first_day_of_each_month.sh
* * * 1 * do_at_every_jan.sh
* * * * 0 do_at_every_sunday.sh
unix

VI frequently used command

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While using VI for many years, there are lots of materials in the man page or some other manual all talking about vi. But I did find some commands which are used quite often during my work with *NIX* like operation system (AIX, MAC, LINUX, CYGWIN, etc.).

  1. command mode and input mode switch $>ESC
  2. navigating right #>l
  3. navigation left #>h
  4. navigation up #>k
  5. navigation down #>j
  6. go to line end #>$
  7. go to 50th line #>50G
  8. go to first line #>1G
  9. go to last line $>GG
  10. go to line head #>0
  11. start a new line #>o
  12. delete current line #>dd
  13. copy current line inside vi #>yy
  14. paste line copied inside vi #>p
  15. delete current character #>x
  16. replace current character #>s
  17. insert at current position #>i
  18. page up #>CTRL b
  19. page down #>CTRL f
  20. append at end of current position #>a
  21. reload current file #>:edit
  22. close w/o save the file #>:q!
  23. save the file #>w
  24. save and close the file #>:wq
  25. to remove control m characters (type ctrl v ctrl m for ^M)#>:%s/^M//g
  26. …more coming soon