使用shell脚本将行插入linux中的新文件

Question

我需要编写shell脚本来创建一个新文件并在其中插入一些东西。问题是，使用sed＆＃39; i / blablabla＆＃39;命令，它仅在文件中至少存在一行时才有效。插入新文件的命令是什么？

由于

Answer 1

echo 'new line' >file_name

此外，您可以使用>>运算符在不使用sed的情况下追加到最后：

echo 'additional line' >>file_name

Answer 2

更多变种：

cat >>file_being_appended_to <<some_random_string
This is the first line
This is the second line and it has a variable in it; it's right here: $some_variable
some_random_string

cat >>file_being_appended_to <<'some_random_string'
This is the first line
This is the second line and it has a variable reference in it; it's right here: $some_variable,
but this variable reference is not expanded because the beginning delimiter string has single quotes around it.
some_random_string

Answer 3

其他变体：

echo 'This is the first line
This is the second line.' >file

some_variable="some value"
echo "This is the first line
This is the second line and it has a variable in it; it's right here: $some_variable" >file