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Top Forums UNIX for Advanced & Expert Users Waking Up USB External Hard Drive for file archiving Post 302928748 by johankor on Monday 15th of December 2014 05:00:33 AM
Old 12-15-2014
Waking Up USB External Hard Drive for file archiving

Hello Experts,

I hope I'm writing to the correct category for my question.

I have a very basic shell script for doing file archiving to the external usb hard drive (WD studio edition II 2TB formatted as FAT32 for compatibility). The shell script only needs to run once per day. It basically downloads some data from a server and converts it to a different format files then makes separate folders for every day on the external disk then copies the converted files to those folders. The problem is drive goes to sleep when idle and I cannot wake it up with normal commands such as "ls" or "cd /media/DISK" or "mkdir -p /media/DISK/somefolder" etc. mkdir command gives input/output error.

If I run "fdisk -l" command as root then the drive starts to spin and I can run the script successfully. But this is not ideal since I would like to put this script to a cronjob and let it run once per day.

Do you have any advice for waking up the disk before running the script?

Best regards

Edit: OS: Centos 5.8 64 bit
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell. Options: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
June 6, 1993 BSD
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