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Issue with the incorrect number of array elements

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# 1  
Old 10-13-2015
Issue with the incorrect number of array elements
Hello ,

I have a file : RestartSession.txt with the below contents :

Code:
Backup  p203pcrw01_OS_Weekly  Failed          full    10/11/2015 10:00:07 PM  1444572007      10/11/2015 10:26:23 PM  1444573583      0:00    0:26    18.76   1      08       0       0       0       2       2       180668  100%    root.root@xdfgrtewses  2015/10/11-331
Backup  p014pdft01_App_Weekly Failed          full    10/12/2015 12:00:04 AM  1444579204      10/12/2015 02:28:42 AM  1444588122      0:00    2:28    247.33  1      00       0       0       0       1       1       189950  100%    root.root@ xdfgrtewses 2015/10/12-3

However when I am trying to check for the number of array elements and the last field as shown below I am not getting correct result

Code:
$ while read line
> do
> IFS='       ' read arr <<< "$line"
> lastIndex=${#arr[@]}
> echo $lastIndex
> val= expr $lastIndex - 1
> echo ${arr[@]:-1}
> Sid=${arr[@]:-1}
> done < RestartSession.txt
1
0
Backup  p203pcrw01_OS_Weekly  Failed          full    10/11/2015 10:00:07 PM  1444572007      10/11/2015 10:26:23 PM  1444573583      0:00    0:26    18.76   1      08       0       0       0       2       2       180668  100%    root.root@xdfgrtewses  2015/10/11-331
1
0
Backup  p014pdft01_App_Weekly Failed          full    10/12/2015 12:00:04 AM  1444579204      10/12/2015 02:28:42 AM  1444588122      0:00    2:28    247.33  1      00       0       0       0       1       1       189950  100%    root.root@ xdfgrtewses 2015/10/12-3
$

Could someone please help me.

Thanks
Rahul
# 2  
Old 10-13-2015
Try read -ain bash or read -A in ksh93 or zsh.



--
Also:
Code:
IFS='       '

probably means something different than what you had in mind:

In bash it is equivalent to IFS=' ' (1 space), which gets interpreted as "one or more spaces"

In ksh93 and zsh:

- if it has an even number of spaces it is equivalent to
Code:
IFS='  '

(two spaces), which gets interpreted as one single space, i.e. each space delimits a field.

- if it has an odd number of spaces it is equivalent to
Code:
IFS=' '

(1 space), which gets interpreted as "one or more spaces"
Last edited by Scrutinizer; 10-13-2015 at 09:57 AM..
These 2 Users Gave Thanks to Scrutinizer For This Post:
jim mcnamara rahul2662
# 3  
Old 10-13-2015
And if you do nothing else with $line then you can replace
Code:
while read line
do
  read -a arr <<< "$line"

by
Code:
while read -a arr
do

This User Gave Thanks to MadeInGermany For This Post:
rahul2662
# 4  
Old 10-13-2015
The solution depends on the file structure, i.e. the field delimiters. Should those be <TAB>s try while IFS=' ' read -a arr; do ..., and e.g. the two datetime fields will be preserved. If they are one or more spaces, the datetime fields will be split up and the field count changes.
This User Gave Thanks to RudiC For This Post:
rahul2662
# 5  
Old 10-13-2015
Hello ,

I am using AWS Redhat server build recently not sure of the version. I tried read -a but it didnt worked but when I tried read -A it worked fine. Also I am not using the following version of code which is working fine.

Code:
while read line                                              ########Find all the Session ID's of the Jobs from the above List
do
    IFS=' ' read -A arr <<< "$line"
    lastIndex=${#arr[@]}
    echo $lastIndex
    val= expr $lastIndex - 1
    Sid=${arr[${#arr[@]} - 1]}
    echo $Sid
 done < $FailFile

Thanks a lot for providing indepth details and help.

Rahul
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