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Help me to perform count & group by operation in shell scripting?

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# 1  
Old 11-08-2012
Help me to perform count & group by operation in shell scripting?
Hi All,

I want to display the distinct values in the file and for each distinct value how may occurance or there.

Test data:

test1.dat

Code:
20121105
20121105
20121105
20121105
20121106
20121106
20121106
20121105

I need to display the output like

Output

Code:
20121105  5
20121106  3

Please help me how to write the shell script for this.

Thanks in advance.

Thanks,
Chandu.
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 11-08-2012 at 03:51 PM.. Reason: code tags, please!
# 2  
Old 11-08-2012
Code:
sort infile | uniq -c
5 20121105
3 20121106

This User Gave Thanks to Yoda For This Post:
bbc17484
# 3  
Old 11-08-2012
try also:
Code:
awk '{a[$1]++;}END{for (i in a) print i, a[i]}' file

---------- Post updated at 02:21 PM ---------- Previous update was at 02:10 PM ----------

or for a shell example:
Code:
#!/bin/sh
 
while read var
do
  ar[$var]=$var
  (( arr[$var]++ ))
done < file
 
for v in ${ar[@]}
do
  echo $v ${arr[$v]}
done

This User Gave Thanks to rdrtx1 For This Post:
bbc17484
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