Solaris scripting problem with ksh88


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Operating Systems Solaris Solaris scripting problem with ksh88
# 1  
Solaris scripting problem with ksh88

Hello,

I want to pick a random element from a list, and created these 2 lines, which work very well in ksh93. Unfortunately, I get this "bad substitution" message in ksh88.

I'm wondering if there's an equivalent to the second line of my script.. or if I have to install ksh93 to make this work.

Here are my lines:

Code:
MATRICE="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@;:[].{}+=<>#|()^&_0123456789"

PASSWD="${MATRICE:$(($RANDOM%${#MATRICE})):1}"

Thanks in advance
# 2  
You may need to split up the logic to achieve this, or awk may do this for you. I did something very clumsy many years ago with this:-
Code:
echo "$arg"|awk '{print substr($1,1,1)}'`

Perhaps that can be adjusted to something more suitable. My stab is:-
Code:
((rand=$RANDOM%7))      # Generates number from 0 to 6
((rand=$rand+1))        # To get number from 1 to 7

PASSWD=`echo $MATRICE $rand|awk '{print substr($1,$2,1)}'`

..... but I'm not saying that this is anywhere near the best Smilie




I hope that this helps though,
Robin
This User Gave Thanks to rbatte1 For This Post:
# 3  
Not sure if this works in ksh88 as I can't test it:
Code:
echo $((RANDOM%${#MATRICE})) | awk -vM="$MATRICE" 'BEGIN {n=split (M, T, "")} {print T[$1]}'

And, it might not be the most efficient approach if you want to use it for e.g. lengthy passwords...

EDIT: Try
Code:
PWLEN=25
while ((++I < PWLEN)); do echo $((RANDOM%${#MATRICE})); done | awk -vM="$MATRICE" 'BEGIN {n=split (M, T, "")} {printf "%s", T[$1]} END {printf "\n"}'
Z7{6M5<2Z6Z6691gcq[k0Z6p

# 4  
Quote:
Originally Posted by rbatte1
You may need to split up the logic to achieve this, or awk may do this for you. I did something very clumsy many years ago with this:-
Code:
echo "$arg"|awk '{print substr($1,1,1)}'`

Perhaps that can be adjusted to something more suitable. My stab is:-
Code:
((rand=$RANDOM%7))      # Generates number from 0 to 6
((rand=$rand+1))        # To get number from 1 to 7

PASSWD=`echo $MATRICE $rand|awk '{print substr($1,$2,1)}'`

..... but I'm not saying that this is anywhere near the best Smilie


I hope that this helps though,
Robin
Thanks!! This works great, and I certainly don't mind if it's not very efficient Smilie


Quote:
Originally Posted by RudiC
Not sure if this works in ksh88 as I can't test it:
Code:
echo $((RANDOM%${#MATRICE})) | awk -vM="$MATRICE" 'BEGIN {n=split (M, T, "")} {print T[$1]}'

And, it might not be the most efficient approach if you want to use it for e.g. lengthy passwords...

EDIT: Try
Code:
PWLEN=25
while ((++I < PWLEN)); do echo $((RANDOM%${#MATRICE})); done | awk -vM="$MATRICE" 'BEGIN {n=split (M, T, "")} {printf "%s", T[$1]} END {printf "\n"}'
Z7{6M5<2Z6Z6691gcq[k0Z6p

I tried the edited code, but it's not working. Do I need to initialize I=0?
Code:
MATRICE="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@;:[].{}+=<>#|()^&_0123456789"
I=0
PWLEN=25
while ((++I < $PWLEN)); do echo $((RANDOM%${#MATRICE})); done | awk  -vM="$MATRICE" 'BEGIN {n=split (M, T, "")} {printf "%s", T[$1]} END  {printf "\n"}'

# 5  
What's the output of that while loop with the pipe to awk removed?
Code:
unset I
while ((++I < PWLEN)); do echo $((RANDOM%${#MATRICE})); done
48
86
63
75
46
3
74
43
87
44
62
83
3
43
39
82
18
49
89
13
14
5
90
8

# 6  
It works properly if I run the commands manually or if I put the commands in a file:
Code:
./test.ksh
9
31
25
38
72
91
81
52
51

If I add "#!/bin/ksh" at the beginning of my script, I get this error:
Code:
./test.ksh
./test.ksh[5]: ++I < 10: bad number

Here's the inside of the script
Code:
#!/bin/ksh
MATRICE="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@;:[].{}+=<>#|()^&_0123456789"
unset I
PWLEN=10
while ((++I < $PWLEN)); do echo $((RANDOM%${#MATRICE})); done


Last edited by rbatte1; 09-10-2014 at 01:17 PM.. Reason: Added CODE tags
# 7  
I would turn MATRICE into an array with one character per array element. Then you just pick a random index into the array. This will work with all versions of ksh and it will be very fast.
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