使用命令行工具计算文件中的行长度

Question

问题

如果我有一个包含许多不同长度行的长文件,我如何计算每个行长度的出现次数？

例:

file.txt的

this
is
a
sample
file
with
several
lines
of
varying
length

跑步count_line_lengths file.txt会给:

Length Occurences
1      1
2      2
4      3
5      1
6      2
7      2

想法？

Answer 1

count.awk:

{
  print length($0);
}

...

$ awk -f count.awk input.txt | sort | uniq -c
      1 1
      2 2
      3 4
      1 5
      2 6
      2 7

Answer 2

纯粹的awk

awk '{++a[length()]} END{for (i in a) print i, a[i]}' file.txt

4 3
5 1
6 2
7 2
1 1
2 2

Answer 3

使用bash数组:

#!/bin/bash

while read line; do
    ((histogram[${#line}]++))
done < file.txt

echo "Length Occurrence"
for length in "${!histogram[@]}"; do
    printf "%-6s %s\n" "${length}" "${histogram[$length]}"
done

示例运行:

$ ./t.sh
Length Occurrence
1      1
2      2
4      3
5      1
6      2
7      2

Answer 4

$ perl -lne '$c{length($_)}++ }{ print qq($_ $c{$_}) for (keys %c);' file.txt

产量

6 2
1 1
4 3
7 2
2 2
5 1