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ksh for loop

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# 1  
Old 06-10-2013
ksh for loop
Any reason why this thing doesn't works in Korn Shell

for (( expr1; expr2; expr3 ))
do
..... ... repeat all statements between do and done until expr2 is TRUE Done

Rgds,
TS
# 2  
Old 06-10-2013
This only works with kornshell 93, not kornshell 88.
# 3  
Old 06-10-2013
And how to identify which korn shell is there on my OS?


Rgds,
TS
# 4  
Old 06-10-2013
If you have a shell variable $KSH_VERSION, you are on ksh93. You can also probe for other features.

You also can try to call your ksh with --version as argument, ksh88 does not print anything
Code:
$ /opt/ast/bin/ksh --version
  version         sh (AT&T Research) 1993-12-28 s
$ /bin/ksh --version
$

# 5  
Old 06-10-2013
Quote:
Originally Posted by targetshell
Any reason why this thing doesn't works in Korn Shell

for (( expr1; expr2; expr3 ))
do
..... ... repeat all statements between do and done until expr2 is TRUE Done

Rgds,
TS
Assuming your version of the Korn shell handles ((...)) in for loops, you've got the logic backwards.
Code:
for (( expr1; expr2; expr3 ))
do      statements...
done

executes the specified statements each time expr2 evaluates to TRUE and leaves the loop when expr2 evaluates to FALSE. For example:
Code:
for (( i=1; i<5; i++))
do    echo $i
done

produces the output:
Code:
1
2
3
4

because i<5 is true the 1st four times through the loop.
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