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I have a 20 mb file with text and ids. I need a grep or something to count and show any duplicated ids.

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Post an example of the text and id format - one or two entries. – izx Jun 7 '12 at 7:28
id-s are in a json array and that's how this looks "code": ["590702HV-16", "590702HV-17", "590702HV-18", "590702HV-19", "590702HV-20", "590702HV-21", "590702HV-23"], "name": ["Pandora Silver Bracelet From"], "descr": ["<span class=\"Label33\"><br><font size=\"2\"><font face=\"Verdana\"><span style=\"font-weight: bold;\">Pandora Bracelet\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 – Martin Jun 7 '12 at 8:57

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up vote 1 down vote accepted
awk '{print $2}' file_name | sort | uniq -c | sort -n | awk '$1>1 {print $2}' > duplicates
for x in $(< duplicates); do grep -n $x file;

so there if you have the ID's in the second column then it will print out the Duplicates ID's

Note: In the file_name ,place your file name .

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Based on your „uniq” idea, it could have been: awk '{print $2}' file_name | sort | uniq -d. – lgarzo Jun 7 '12 at 8:03

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