Editor(vi)가 없을 때 파일 수정하기

$ cat file
asdfasdfasdf
$ echo "asdf" > file
$ cat file
asdf

$ cat file
asdf
$ echo "asdf" >> file
$ cat file
asdf
asdf

$ cat file
asdf
$ cat > file
aaaa
bbbb
^D # Command+D
$ cat file
aaaa
bbbb

$ cat file
asdf
$ cat >> file
aaaa
bbbb
^D # Command+D
$ cat file
asdf
aaaa
bbbb

$ cat file
asdf
$ cat <<EOF > file
aaaa
bbbb
EOF
$ cat file
asdf
aaaa
bbbb