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I need to extract last column of a file and compare the values

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Top Forums Shell Programming and Scripting I need to extract last column of a file and compare the values
# 1  
Old 08-04-2007
I need to extract last column of a file and compare the values
Hi,

I am new to unix and I need help in solving below mentioned issue, really appreciate ur help.

I have a file

sam, john, 2324, 07142007
tom, thomson, 2343, 07142007
john, scott, 2478, 07142007

its a comma delimited file, I need to extract the last column from each line and this column is a date field. The date should be unique through out the file, if this column has got more than one value, the script should be exited.

Please help me out.

Thank you
# 2  
Old 08-04-2007
Code:
awk -F", " '{ arr[NF]++; for ( i in arr ) { if ( arr[i] > 1 ) { exit;} } }END{ for ( i in arr ) { print i } }' filename

# 3  
Old 08-04-2007
returning always 1
Thankx for the reply,

I tested this with duplicate values and also unique muliple values in the column of the file and its always returning 1

data in the file

,,02132007
,,03132007

script is returning 1

,,02132007
,,02132007

here also its retruning 1

if all the column values return unique value out of all the records then I need that unique value in my logic. if it returns more than one value then it should exit with some exit code.

can you please modify the script, would be real helpful. I am in urgent need of it.

Thanks
# 4  
Old 08-04-2007
with duplicate values

Code:
cat file
sam, john, 2324, 07142007
tom, thomson, 2343, 07142007
john, scott, 2478, 07142007

Code:
awk -F", " '{ arr[$NF]++; for ( i in arr ) { if ( arr[i] > 1 ) { dup=1; exit} } }END{ if ( dup != 1 ) { for ( i in arr ) { print i } } }' file

<< no output >> as there are duplicates

without duplicate values
Code:
cat file
sam, john, 2324, 17142007
tom, thomson, 2343, 27142007
john, scott, 2478, 07142007

the above command returns
Code:
07142007
27142007
17142007

# 5  
Old 08-04-2007
another way:

Code:
awk -F", " 'arr[$NF] != 0 {exit} { arr[$NF]++ ; cnt++ } END { if ( cnt == NR ){ for ( i in arr ) { print i }}}' filename

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