From within my bash script I need to open a file that will have a uniqu
identifier.

/home/bpatton/.fleet_cmd_file.<id#>

When I did this in PERL I used the time function to return the time in
seconds
The ferl functions is described as
Returns the number of non-leap seconds since
whatever time the system considers to be the epoch
(that's 00:00:00, January 1, 1904 for Mac OS, and

It needs to be a unique number/name

--
___  _ ____       ___       __  __
/ _ )(_) / /_ __  / _ \___ _/ /_/ /____  ___
/ _  / / / / // / / ___/ _ `/ __/ __/ _ \/ _ \
/____/_/_/_/\_, / /_/   \_,_/\__/\__/\___/_//_/
/___/
Texas Instruments ASIC Circuit Design Methodlogy Group
Dallas, Texas, 214-480-4455,  b-patton@ti.com

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"Billy N. Patton" schrieb
> From within my bash script I need to open a file that will have a
> uniqu[e] identifier.
>
> /home/bpatton/.fleet_cmd_file.<id#>
>
> When I did this in PERL I used the time function to return the
> time in  seconds
> The ferl functions is described as
> Returns the number of non-leap seconds since
>               whatever time the system considers to be the epoch
>               (that's 00:00:00, January 1, 1904 for Mac OS, and
>
> It needs to be a unique number/name
>
with GNU date: /home/bpatton/.fleet_cmd_file.`date +%s`
with bash /home/bpatton/.fleet_cmd_file.${RANDOM}

As for the uniqueness, this is left as an exercise to the reader.

HTH. YMMV.
Martin

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Billy N. Patton <b-patton@ti.com> wrote:
> From within my bash script I need to open a file that will have a uniqu
> identifier.
>
> /home/bpatton/.fleet_cmd_file.<id#>
>
> When I did this in PERL I used the time function to return the time in
> seconds
> The ferl functions is described as
> Returns the number of non-leap seconds since
>               whatever time the system considers to be the epoch
>               (that's 00:00:00, January 1, 1904 for Mac OS, and
>
> It needs to be a unique number/name

Use $$ which is PID, if you want uniqueness while machine is running.
If you want unique name in your filesystem, then
man mktemp
man tempfile
man date

--
William Park <opengeometry@yahoo.ca>
Open Geometry Consulting, Toronto, Canada

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Billy N. Patton wrote:
>  From within my bash script I need to open a file that will have a uniqu
> identifier.
>
> /home/bpatton/.fleet_cmd_file.<id#>
>
> When I did this in PERL I used the time function to return the time in
> seconds
> The ferl functions is described as
> Returns the number of non-leap seconds since
>              whatever time the system considers to be the epoch
>              (that's 00:00:00, January 1, 1904 for Mac OS, and
>
> It needs to be a unique number/name
>

The time in seconds isn't guaranteed unique (what if you have two
instances of the script running, or the script executes twice within a
second, or the clock gets set back...)

Try uuidgen for something more unique and accessible via bash.  A UUID
is usually made from a combination of the hardware MAC address, random
values, and a time value with better than one second resolution.

-Peter

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Martin Blume wrote:

> "Billy N. Patton" schrieb 
> with GNU date: /home/bpatton/.fleet_cmd_file.`date +%s`
> with bash /home/bpatton/.fleet_cmd_file.${RANDOM}
>
> As for the uniqueness, this is left as an exercise to the reader.
>
date +%G%j%k%m%S%N

:-)

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Peter Ammon wrote:

> Billy N. Patton wrote: 
>
> The time in seconds isn't guaranteed unique (what if you have two
> instances of the script running, or the script executes twice within a
> second, or the clock gets set back...)
>
> Try uuidgen for something more unique and accessible via bash.  A UUID
> is usually made from a combination of the hardware MAC address, random
> values, and a time value with better than one second resolution.
>
So! That's where those Doze programmers get those stupid registry entry
values! ;-)

Cheers!
Rich

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