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Top Forums Shell Programming and Scripting understand the function to execute Post 302336363 by kshji on Wednesday 22nd of July 2009 02:16:37 AM
Old 07-22-2009
ksh works, bash and bsh no. Why ? ksh has done like syntax idea is, bash makers has technical answer (last 10 years). There are many forums, where has been asked this question manymanmany times from other shell makers, why not.

Make function like command then no problem in any shell.

Here is solution for read problem in other than ksh (this solution works with ksh also):
Code:
gettime() {
read hour <<EOF
$(date '+%H')
EOF
TIME=${hour}
}

gettime
echo $TIME

This is better way to do function - works like command. My opinion.
Code:
gettime() 
{
   $(date '+%H')
}

TIME=$( gettime )
echo $TIME

 

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let(1)								   User Commands							    let(1)

NAME
let - shell built-in function to evaluate one or more arithmetic expressions SYNOPSIS
ksh let arg... ksh93 let [expr...] DESCRIPTION
ksh Each arg is a separate arithmetic expression to be evaluated. ksh93 let evaluates each expr in the current shell environment as an arithmetic expression using ANSI C syntax. Variables names are shell vari- ables and they are recursively evaluated as arithmetic expressions to get numerical values. let has been made obsolete by the ((...)) syn- tax of ksh93(1) which does not require quoting of the operators to pass them as command arguments. EXIT STATUS
ksh ksh returns the following exit values: 0 The value of the last expression is non-zero. 1 The value of the last expression is zero. ksh93 ksh93 returns the following exit values: 0 The last expr evaluates to a non-zero value. >0 The last expr evaluates to 0 or an error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), ksh93(1), set(1), typeset(1), attributes(5) SunOS 5.11 2 Nov 2007 let(1)
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