Linux : ファイルにテキストを追記で書き込む

[dacelo@info]$ echo aaa > test.txt
[dacelo@info]$ cat test.txt 
aaa

[dacelo@info]$ echo aaa > test.txt [dacelo@info]$ cat test.txt aaa

[dacelo@info]$ echo bbb > test.txt
[dacelo@info]$ cat test.txt 
bbb

[dacelo@info]$ echo bbb > test.txt [dacelo@info]$ cat test.txt bbb

[dacelo@info]$ echo aaa > test.txt
[dacelo@info]$ echo kkk >> test.txt
[dacelo@info]$ echo bbb >> test.txt
[dacelo@info]$ cat test.txt 
aaa
kkk
bbb

[dacelo@info]$ echo aaa > test.txt [dacelo@info]$ echo kkk >> test.txt [dacelo@info]$ echo bbb >> test.txt [dacelo@info]$ cat test.txt aaa kkk bbb