Linux，我怎么能这样做，用shell脚本进行文件操作？

Question

我在linux中有一个文件，我想要一个shell脚本：

file:|    | After running the script:
A a  |    | A a g k
B b  |    | B b k
C c  | -> | C c
A g  |
A k  |
B k  |

Answer 1

perl -lane 'push @{$data{$F[0]}}, $F[1]} {$,=" "; print $_, @{$data{$_}} for sort keys %data' file

awk '{data[$1] = data[$1] $2 " "} END {for (key in data) print key, data[key]}' file