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linuxでファイルを複数行を一行にする方法

1, trコマンドを利用する

~ koukou.chou.ts$ cat  test
1
2
3
4
5
6
7
8
9
10
~ koukou.chou.ts$ cat test | tr "\n" " ";echo
1 2 3 4 5 6 7 8 9 10 

2, awkコマンドを利用する

~ koukou.chou.ts$ awk '{if(NR%10){ORS=" "}else{ORS="\n"};print;}' test
1 2 3 4 5 6 7 8 9 10

3, perlスクリプトを利用

~ koukou.chou.ts$ perl -pe 's/\n/ /;' test && echo
1 2 3 4 5 6 7 8 9 10 

4, xargを利用

~ koukou.chou.ts$ cat test | xargs
1 2 3 4 5 6 7 8 9 10

5, vim のsedを利用

~ koukou.chou.ts$ vim test 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
~                                                                                                                                                    
~                                                                                                                                                    
~                                                                                                                                                    
                                                                                                                                                  :%s/\n/ /g

6, sedを利用する

~ koukou.chou.ts$ sed 'N;N;N;N;N;N;N;N;N;s/\n/ /g' test
1 2 3 4 5 6 7 8 9 10
~ koukou.chou.ts$ 
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Help us understand the problem. What are the problem?