cat重定向写入

将stdin的内容重定向到test文件(以覆盖文件内容的方式，若此文件不存在，则创建之)，且当stdin中含有EOF时完成写入： ufo@ufo:/tmp$ cat > test << EOF

this is first line this is second line this is thrird line this is fourth line EOF

ufo@ufo:/tmp$ cat test this is first line this is second line this is thrird line this is fourth line

将stdin的内容重定向以添加的方式到已经存在test文件，且当stdin中含有EOF时完成写入： ufo@ufo:/tmp$ cat >> test < EOF bash: EOF: 没有那个文件或目录 ufo@ufo:/tmp$ cat >> test << EOF

this is five line this is sixth line EOF ufo@ufo:/tmp$ cat test this is first line this is second line this is thrird line this is fourth line this is five line this is sixth line

说明：以上的EOF可以为你想要的其它字符串。