bash - 使用 bash 从文件中选择单词

Question

如何从包含特定字符的文件中选择单词？

假设我有一个包含单词的文件，我需要由字符 a,b,c 组成的单词

/upd 我试过这个命令:grep -E "[a,b,c]*.[b]" /usr/share/dict/words
/upd 示例:
file.txt 包含:

qwerty
asdf
abb
bbb
zxc
abc

结果必须为:

abb
bbb
abc

Answer 1

可能这就是你要找的

grep -wo "[abc]*" 

来自 man grep

-w, --word-regexp Select only those lines containing matches that form whole words.

-o, --only-matching Print only the matched (non-empty) parts of a matching ? line, with each such part on a separate output line.

测试

$ cat input
qwerty
asdf
abb
bbb
zxc
abc
qweabcqwe

$ grep -wo "[abc]*"  input
abb
bbb
abc