ls命令的显示格式

along@along-laptop:~/code/shell$ ls
awk cut grep sed shell sort system_status test tr
along@along-laptop:~/code/shell$ ls > file
along@along-laptop:~/code/shell$ cat file
awk
cut
file
grep
sed
shell
sort
system_status
test
tr

along@along-laptop:~/code/shell$ awk 'BEGIN{"ls"|getline d;print d}'
awk