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Shell Programming and Scripting
how to get variable to re-evaluate itself?
Post 94707 by vino on Tuesday 3rd of January 2006 08:51:45 AM
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I have variables:
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Text
echo $BAR
FOO
This is what I'd like to do:
echo ${$BAR} (this won't work)
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---------- Post updated at 03:37 AM ---------- Previous update was at 02:22 AM ----------
I am using linux bash.
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LEARN ABOUT OPENSOLARIS
sleep
sleep(1) User Commands sleep(1) NAME
sleep - suspend execution for an interval SYNOPSIS
/usr/bin/sleep /usr/bin/sleep time ksh93 sleep time DESCRIPTION
/usr/bin/sleep sleep suspends execution for at least the integral number of seconds specified by time. ksh93 sleep suspends execution for at least the time in seconds specified by time or until a SIGALRM signal is received. OPERANDS
/usr/bin/sleep The following operands are supported for /usr/bin/sleep: time time in seconds can be specified as a non-negative decimal integer number. ksh93 The following operands are supported: time Specify time in seconds as a floating point number. The actual granularity depends on the underlying system, normally around 1 mil- lisecond. EXAMPLES
Example 1 Suspending Command Execution The following example executes a command after a certain amount of time: example% (sleep 105; command)& Example 2 Executing a Command Every So Often The following example executes a command every so often: example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES). >0 An error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/sleep +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ ksh93 +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Uncommitted | +-----------------------------+-----------------------------+ SEE ALSO
ksh93(1), wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions is taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility takes the standard action for all other signals. SunOS 5.11 20 Nov 2007 sleep(1)