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Top Forums Shell Programming and Scripting how to convert string to an integer and how to do calculations like add.,sub.,mult. on it Post 302498735 by mfsteve on Tuesday 22nd of February 2011 10:04:38 AM
Old 02-22-2011
As a rule, you would use $hour for a numeric value vice ${hour} for text.

Code:
# hour=`date +%H`
# echo $hour
10

# hour_plus_10=$(($hour + 10))
# echo $hour_plus_10
20

To use the string version:

# echo "What is your ${hour}-${hour_plus_10}?"
What is your 10-20?


Last edited by mfsteve; 02-22-2011 at 11:09 AM.. Reason: Additional info
 

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HYLAFAX-SHUTDOWN(5)						File Formats Manual					       HYLAFAX-SHUTDOWN(5)

NAME
etc/shutdown - server shutdown control file DESCRIPTION
If the file etc/shutdown is present it describes when a HylaFAX server is to be shutdown and may contain a descriptive message to return to clients explaining the reason for the shutdown. This file is used by the hfaxd(8) program. The file has the following format: <year> <month> <day> <hour> <minute> <deny> <disconnect> <shutdown message text> The first line defines the date and time the server should be shutdown and the time preceding at which unprivileged clients should be denied service or disconnected; these fields are described in more detail below. Any lines that follow the first are taken as the text of a message to return to clients when notifying them of a scheduled shutdown or when denying them service. <year> The decimal year; e.g. 1996. <month> The decimal month; e.g. 10 for October. <day> The decimal day of the month in the range [1..31]. <hour> The decimal hour since midnight; in the range [0..23]. <minute> The decimal minute after the hour; in the range [0..59]. <deny> The time prior to the shutdown time at which to deny service to unprivileged clients. This value is specified as decimal number in the form HHMM; e.g. 130 for 1 hour and 30 minutes. <disconnect> Time time prior to the shutdown time at which to disconnect unprivileged clients that are logged in to the server. This value is specified as a decimal number in the form HHMM. NOTES
This file is typically created using the ``SHUT'' command supported by hfaxd(8). SEE ALSO
hfaxd(8), hylafax-server(5) January 18, 1996 HYLAFAX-SHUTDOWN(5)
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