Linux Shell Bash Spilt文本文件

Question

我有一个庞大的英语单词列表，看起来像这样。

1.    do accomplish, prepare, resolve, work out
2.    say suggest, disclose, answer
3.    go continue, move, lead
4.    get bring, attain, catch, become
5.    make create, cause, prepare, invest
6.    know understand, appreciate, experience, identify
7.    think contemplate, remember, judge, consider
8.    take accept, steal, buy, endure
9.    see detect, comprehend, scan
10.    come happen, appear, extend, occur
11.    want choose, prefer, require, wish
12.    look glance, notice, peer, read
13.    use accept, apply, handle, work
14.    find detect, discover, notice, uncover
15.    give grant, award, issue
16.    tell confess, explain, inform, reveal

我希望能够提取第二列

do
say
go
get
make
know
think
take
see
comer
want
look
use
find
give
tell

任何人都知道如何在shell bash中做到这一点。

谢谢。

Answer 1

使用bash

$ cat tst.sh
#!/usr/bin/env bash
while read line; do 
line=${line//[0-9.]} 
line=${line/,*}  
echo ${line% *} 
done < /path/to/input_file
$ ./tst.sh
do
say
go
get
make
know
think
take
see
come
want
look
use
find
give
tell

使用sed

$ sed 's/[^a-z]*([^ ]*).*/1/' input_file
do
say
go
get
make
know
think
take
see
come
want
look
use
find
give
tell

Answer 2

有很多方法可以做到这一点：

awk '{print $2}' input-file
cut -d ' ' -f 5 input-file  # assuming 4 spaces between the first columns
< input-file tr -s ' ' | cut -d ' ' -f 2
< input-file tr -s ' ' \t | cut -f 2
perl -lane 'print $F[1]' input-file
sed 's/[^ ]*  *([^ ]*).*/1/' input-file
while read a b c; do printf '%sn' "$b"; done < input-file

Answer 3

awk:怎么样

cat file.txt | awk '{print $2}'

这行得通吗？