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Full Discussion: Unix Korn Shell Array Issue (SunOS)
Top Forums Shell Programming and Scripting Unix Korn Shell Array Issue (SunOS) Post 302097114 by Andrek on Tuesday 21st of November 2006 07:05:46 PM
Old 11-21-2006
Ok I'll do my best...

while [ $start -lt ${#lsarry[*]} ]
Simple while loop.
It keeps looping until the var $start is lessthan the total number of elements in the arry.
eg ${#lsarry[*]} would be equall to 4 if
the array is made up as follows "A B C D"
The # indicates to give the "count" of the elements in the arry and the "*" simply indicats ALL the elements.... (I guess its like a wild card...ie ls *-> which list every thing)

the "-d" is a test for a directory. Does it mean "IF 'D' = ArrayValue?" NO.

Do a man on "test" and you will see all the options. UNIX will "test" the input and return true if the path/to/target is a directory or false if not. How is it being inerpreted?

if [ -d ${lsarry[$start]} ] How is the code being interpreted? - as you know $start is increased by 1 each loop so the "next" element in the arry is placed into the "test" statment and evaluated....ie ${lsarry[1], ${lsarry[2], etc....

you can run the script with full debug on to see whats happening by either...
1) add set -x to the second line ....or
2) # sh -x {scriptname}

Hope this helps.

PS do a man on sh-bourne or man on ksh and near the bottom it talks about arrays and what "#" etc means....

Have fun :-)
 

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ns_lctl(3aolserver)					    AOLserver Built-In Commands 				       ns_lctl(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME

       ns_for, ns_foreach, ns_while, ns_lctl - Replacements for standard Tcl loop commands which enable monitoring and control

SYNOPSIS

       ns_for start test next body
       ns_foreach varname list body
       ns_foreach varlist1 list1 ?varlist2 list2 ...? body
       ns_while test body
       ns_lctl cancel id
       ns_lctl eval id script
       ns_lctl info id
       ns_lctl install command
       ns_lctl list
       ns_lctl pause id
       ns_lctl result id
_________________________________________________________________

DESCRIPTION

       The  ns_for, ns_foreach, and ns_while commands are replacements for cooresponding Tcl commands with the additional capability of monitoring
       and control through the ns_lctl command.

       ns_for start test next body
	      See the for(n) man page for usage.

       ns_foreach start test next body
	      See the foreach(n) man page for usage.

       ns_foreach varlist1 list1 ?varlist2 list2 ...? body
	      See the foreach(n) man page for usage.

       ns_while test body
	      See the while(n) man page for usage.

       ns_lctl cancel id
	      Mark the given loop to cancel at the next iteration, resulting in the loop returning with TCL_ERROR.

       ns_lctl eval id script

       ns_lctl info id

       ns_lctl install command

       ns_lctl list

       ns_lctl pause id

       ns_lctl result id

SEE ALSO

       for(n), foreach(n), while(n)

KEYWORDS

       threads, iteration, list, looping, cancel

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