[英]Using grep and pipes in Unix to find specific words
Let's say I'm using grep , and I use use the -v option on a text file to find all the words that do not contain vowels. 假设我正在使用grep ,并且我在文本文件中使用-v选项来查找所有不包含元音的单词。 If I then wanted to see how many words there are in this file that do not contain vowels, what could I do? 如果我想查看此文件中有多少单词不包含元音,我该怎么办?
I was thinking of using a pipe and using the rc command by itself. 我正在考虑使用管道并单独使用rc命令。 Would that work? 那会有用吗? Thanks. 谢谢。
Actually, I believe that you want wc
, not rc
, as in: 实际上,我相信你想要wc
,而不是rc
,如:
grep -civ '[aeiouy]' words.txt
For example, consider the file: 例如,考虑文件:
$ cat words.txt
the
words
mph
tsk
hmmm
Then, the following correctly counts the three "words" without vowels: 然后,以下正确计算没有元音的三个“单词”:
$ grep -civ '[aeiouy]' words
3
I included y
in the vowel list. 我在元音列表中包含了y
。 You can decide whether y
or not it should be removed. 你可以决定是否y
或不应该被删除。
Also, I assumed above that your file has one word per line. 另外,我假设你的文件每行有一个单词。
The grep options used above are as follows: 上面使用的grep选项如下:
-v
means exclude matching lines -v
表示排除匹配行
-i
makes the matching case-insensitive -i
使匹配不区分大小写
-c
tells grep to return a count, not the actual matches -c
告诉grep返回一个计数,而不是实际的匹配
$ echo the tsk hmmm | grep -io '\b[bcdfghjklmnpqrstvxz]*\b' | wc -l
2
Because \\b
matches at word boundaries, the above regex matches only words that lack vowels. 因为\\b
匹配单词边界,所以上面的正则表达式只匹配缺少元音的单词。 -o
tells grep to print only the matching portion of the line, not the entire. -o
告诉grep只打印行的匹配部分,而不是整个。 Because -c
counts the number of lines with matches, it is not useful here. 因为-c
计算匹配的行数,所以在这里没用。 wc -l
is used instead to count matches. 改为使用wc -l
来计算匹配。
The following script will count the number of words that don't contain vowels (if there are several words per line): 以下脚本将计算不包含元音的单词数(如果每行有多个单词):
#!/bin/bash
# File can be a script parameter
FILE="$1"
let count=0
while read line; do
for word in $line; do
grep -qv "[aeiou]" <<< "$word"
if [ $? -eq 0 ]; then
let count++
fi
done
done < FILE
echo "words without vowels: $count"
If there is only one word per line, then the following will be enough: 如果每行只有一个单词,那么以下就足够了:
grep -cv "[aeiou]" < file
If multiple words can be on the same line, and you want to count them too, you can use grep -o
with wc -l
to count all the matches correctly, like so: 如果多个单词可以在同一行,并且您也想对它们进行计数,则可以使用grep -o
和wc -l
来正确计算所有匹配项,如下所示:
$ echo "word work no-match wonder" | grep -o "wo[a-z]*" | wc -l
3
You could, alternatively, do this all within an Awk: 或者,您可以在Awk中完成所有操作:
awk '!/[aeiou]/ {n++} END {print n}' file
For lines with multiple fields: 对于具有多个字段的行:
awk '{for(i=1; i<=NF; i++) if($i !~ /[aeiou]/) n++} END {print n}' file
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