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Full Discussion: crontab question
Top Forums Shell Programming and Scripting crontab question Post 302584710 by methyl on Saturday 24th of December 2011 05:47:19 PM
Old 12-24-2011
Quote:
30 5-23 * * * "echo "Hello"
30 0-3 * * * "echo "Hello"
These crons do not process every 30 mins. They process every hour. All the lines which contain three double-quote characters are syntax errors.
Please clarify.

Quote:
5,10,15,20,25,30,35,40,45,50,55 3-4, * * * "echo Hello"
This cron does not process every 5 mins between 3 and 4. More like 3 and 5 (but missing out exact hours).
The extra comma in "3-4," makes that line a syntax error too.
Please clarify.


Sorry, but you are asking us to simplify something which does not conform to specification at all. Also, all three lines contain syntax errors.


To answer your original question. Yes, it can be done with TWO entries (and no special Shell or whatever).
One cron to run every 30 mins and one cron to fill in the extra 5 mins intervals.
Code:
0,30 0-23 * * * echo "Hello"
5,10,15,20,25,35,40,45,50,55 3 * * * echo "Hello"


Last edited by methyl; 12-25-2011 at 06:02 AM.. Reason: Added a solution
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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