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is there any way to read a line twice in KSH

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# 1  
Old 01-24-2006
is there any way to read a line twice in KSH
Hi All,

Is there any way to read the previous line in file reading ?
or

is there any way to read a line twice in KSH ?


thanks in advance !!
Srini
# 2  
Old 01-24-2006
Smilie You should just copy the variable, but I suppose this would work:

read line1
echo "$line1" | read line2
# 3  
Old 01-24-2006
I always store the line in the variable prv_line and use it after going to the next line read...

don't think we have unix built in functionality, eager to know if there is one...
# 4  
Old 01-24-2006
My actual proble is :

i have a file as below

AAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBBBBBB
AAAAAAAAAAAAA
-------------------
-------------------
-------------------
-------------------
-------------------
-------------------
BBBBBBBBBBBB
AAAAAAAAAAAA
AAAAAAAAAAAA
AAAAAAAAAAAA
AAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBBBBBB
AAAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBB
AAAAAAAAAAAA
AAAAAAAAAAAA
...

I want the out put be as follows-

AAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBBBBBB
**************
**************
AAAAAAAAAAAAA
-------------------
-------------------
-------------------
-------------------
-------------------
-------------------
BBBBBBBBBBBB
**************
**************
AAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBBBBBB
**************
**************
AAAAAAAAAAAAA
-------------------
-------------------
-------------------
BBBBBBBBBB

I am reading the file using while loop..

1. while first line is AAAAAAAAAA
2,. do
3. until line=AAAAAAAAAAA
4. print line
5. done
6. done

when I use this logic some of the blocks are missing in the output as, the "until loop has already read the AAAAAAA line" (at step 3)

its not going to while loop in the next iteration (Step1) for check condition

Can any body have a fix for this ?

Thanks
Srini
# 5  
Old 01-24-2006
you don't want to repeat "AAAAAAAAAA" ??

can you tell me the actual logic... not getting it.
Last edited by mahendramahendr; 01-24-2006 at 02:56 PM..
# 6  
Old 01-24-2006
file reading issue
Perderabo/ mahendramahender

Hope this will explaing you better



Thanks
Srini
Last edited by Srini75; 01-25-2006 at 11:14 AM..
# 7  
Old 01-25-2006
I tried this on your sample file...
Code:
awk '/Error/{print ORS p;c=3}c-->0;{p=$0}' some.txt

Result...
Code:
Processing uid abc123 tpn
Error on trans: db
FAILURE on uid abc123 during trans
Cannot fetch from the table

Processing uid abc1234 tpn
Error on trans: db
FAILURE on uid abc1234 during trans
Cannot fetch from the table

Processing uid abc1235 tpn
Error on trans: db
FAILURE on uid abc1235 during trans
Cannot fetch from the tabe

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