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Shell Programming and Scripting

replace cat huge_multiplefiles |sort |uniq -c

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# 1  
Old 09-01-2010
replace cat huge_multiplefiles |sort |uniq -c
Does any one know any command runs faster than this to give duplicate numbers

Code:
cat file1 file2 ....file 100 | sort |uniq -c

thanx
# 2  
Old 09-01-2010
no need for cat. might help some

Code:
sort  file1 file2 ....file100|uniq -c

# 3  
Old 09-01-2010
Code:
awk '{a[$0]++}END {for i in a) print a[i],i}' file*

# 4  
Old 09-01-2010
If you just want to know which lines are duplicated, "uniq -d" will be much quicker than "uniq -c".

Depending on the actual file sizes there can be a spectacular improvement by sorting each file individually then finally using the merge function "sort -m" once.
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