如何使用uniq -c选项进行自定义格式化？

Question

来自维基百科:

uniq
-c Generate an output report in default style except that each line is preceded by a count of the number of times it occurred. If this option is specified, the -u and -d options are ignored if either or both are also present.

在我的机器上,它取计数并将其放在每一行的开头.我想要的是将它放在行尾,逗号后面.如何才能做到这一点？

例:

aa
aa
bb
cc
cc
dd

应改为:

aa,2
bb,1
cc,2
dd,1

Answer 1

你可以试试这样的东西 -

awk '{a[$1]++}END{for (i in a) print i,a[i] | "sort"}' OFS="," filename

要么

awk -v OFS="," '{print $2,$1}' <(uniq -c file)

要么

uniq -c file | awk '{printf("%s,%s\n",$2,$1)}'

要么

while IFS=' +|,' read count text; do 
    echo "$text, $count"; 
done < <(uniq -c tmp)

测试:

[jaypal:~/Temp] cat file
aa
aa
bb
cc
cc
dd

[jaypal:~/Temp] awk '{a[$1]++}END{for (i in a) print i,a[i] | "sort"}' OFS="," file
aa,2
bb,1
cc,2
dd,1

测试2:

[jaypal:~/Temp] awk -v OFS="," '{print $2,$1}' <(uniq -c file)
aa,2
bb,1
cc,2
dd,1

TEST3:

[jaypal:~/Temp] while IFS=' +|,' read count text; do 
echo "$text,$count"; 
done < <(uniq -c tmp)
aa,2
bb,1
cc,2
dd,1