Why r mu spaces missing

atl_geek · #1 (**permalink**) 07-26-07, 11:03

I have a following script

i=4
temp='Rows Read = '$i
echo $temp

Iam getting the following output
Rows Read = 4

I understand why my spaces are missing. Any clues be appreciated

thx
Tony

atl_geek · #2 (**permalink**) 07-26-07, 11:28

Plz ignore my typos in my previous question

Following is the problem

i=4
temp='Rows Read = '+$i

when i say echo $temp iam getting the following output

Rows Read = 4

I see my spaces have been removed right before =

Any one has a clue why korn shell behave this way

mike_bike_kite · #3 (**permalink**) 07-26-07, 12:45

I don't have ksh on my machine and your code works fine in bourne shell but try:

Code:

i=4
echo "Rows Read = $i"

Mike

atl_geek · #4 (**permalink**) 07-26-07, 13:28

There should be 11 spaces right before the symbol =
For some reason those 11 spaces are disappearing
i=4
temp ='Rows Read = '$i

For some reason those 11 spaces are disappearing

mike_bike_kite · #5 (**permalink**) 07-26-07, 16:19

Quote:

There should be 11 spaces right before the symbol =

Perhaps you should of stated this originally.

Quote:

For some reason those 11 spaces are disappearing

Are you sure the problem is in your shell script - I ran my bit of code above (with 11 spaces) and it shows them fine. Could you try producing a very small shell script just to test these lines only? Is something else processing the output of this script and removing the 11 spaces?

Code:

#!/bin/sh

i=4
echo "num rows           = $i"

If that doesn't work then just avoid using spaces ie

Code:

#!/bin/sh

i=4
echo "--------- Num rows = $i"

atl_geek · #6 (**permalink**) 07-26-07, 17:18

echo command works fine. But when you try to send a string with leading or trailing spaces then they are disappearing. I cannot use any other charecter other than space as iam using this code snippet to grep a certain char set which has space.

mike_bike_kite · #7 (**permalink**) 07-26-07, 18:57

The code I gave you with the spaces before the = sign works fine and prints all the spaces that you wanted. If something else is removing them then I'd look there for your problem.

As another alternative could you just change the grep command to look for just the "Rows Read" rather than the whole string?

Mike

Tyveleyn · #8 (**permalink**) 07-27-07, 17:12

Try:

Code:

printf "Rows read           = %d" "$i"

instead of echo for displaying.
If you want to 'grep' for a string containing 11 spaces you could also:

Code:

egrep "Rows read {11}= $i"

Regards

atl_geek · #9 (**permalink**) 07-27-07, 18:03

When I use echo or printf it will work fine. But i need to save it in a variable. When i save it a variable , it is replacing all the consecutive spaces with one space.

I need to save it as a string in a variable so that i can use it in my grep command when i do a pattern search.

mike_bike_kite · #10 (**permalink**) 07-28-07, 08:23

The simplest solution is just to change the grep to:

Code:

# even simpler might be just to use
grep "Rows Read"

Or, if this might match the wrong rows, use a more complete match like:

Code:

# match against Rows Read followed by any number of spaces then
# an = sign and any number of spaces and then a number
grep "Rows Read *= *[0-9][0-9]*"

No doubt, in time, you'll give us enough information to answer your query fully

Mike

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