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Full Discussion: for loop throwing an error
Top Forums Shell Programming and Scripting for loop throwing an error Post 302394777 by cfajohnson on Friday 12th of February 2010 01:22:11 PM
Old 02-12-2010
Quote:
Originally Posted by mac4rfree
@cfajohnson,
Thanks for pointing out the errors, i have changed the sh to ksh93.

But even now i am not able to run the for command.

Code:
tci001wasd02 $ cat array_for.sh
#/bin/ksh93

set -A array "are" "you" "there";


I would use the more portable (though arrays are not standard) form of assigning an array:
Code:
array=( are you there )   ## doesn't work in ksh88, AFAIK

Quote:
Code:
for (( i = 0 ; i < ${#array[@]} ; i++ ))
do
echo ${array[$i]}
done
tci001wasd02 $ sh -vx array_for.sh
#/bin/ksh93

set -A array "are" "you" "there";
+ set -A array are you there

for ((array_for.sh[5]: 0403-057 Syntax error at line 5 : `(' is not expected.


Then use the standard syntax.

(That works for me in ksh93; perhaps you are using a different version of ksh93. All the more reason to use the standard syntax; it will work in all versions and other shells.)
Quote:

the command u mentioned above

Code:
for i in "${!array[@]}"

will give me all the elements in the array. But i want only certain elements from the array, which i wanted to do it using a for loop...

Both forms give you all the elements in the array. You have to select the ones you want inside the loop.

Always use the standard syntax when possible without losing efficiency. Non-standard features may (and often do) change from one verion of a shell to the next.
 

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continue(1T)						       Tcl Built-In Commands						      continue(1T)

__________________________________________________________________________________________________________________________________________________

NAME
continue - Skip to the next iteration of a loop SYNOPSIS
continue _________________________________________________________________ DESCRIPTION
This command is typically invoked inside the body of a looping command such as for or foreach or while. It returns a TCL_CONTINUE code, which causes a continue exception to occur. The exception causes the current script to be aborted out to the innermost containing loop command, which then continues with the next iteration of the loop. Catch exceptions are also handled in a few other situations, such as the catch command and the outermost scripts of procedure bodies. EXAMPLE
Print a line for each of the integers from 0 to 10 except 5: for {set x 0} {$x<10} {incr x} { if {$x == 5} { continue } puts "x is $x" } SEE ALSO
break(1T), for(1T), foreach(1T), return(1T), while(1T) KEYWORDS
continue, iteration, loop ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWTcl | +--------------------+-----------------+ |Interface Stability | Uncommitted | +--------------------+-----------------+ NOTES
Source for Tcl is available on http://opensolaris.org. Tcl continue(1T)
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