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#print So far all the special characters in the substitute command are used to select the string to be replaced. There is one character used in the new string to be inserted. It is '&' which when used

#print Once in a while you want to add text just before a certain line, rather than just after it. For this purpose there is a command 'i' (insert) which is just like 'a' except that the new material

#print Note that there is quite a list of characters that are special to the editor: . [ * ^ $ & / What do you do when you want to use one of these characters as itself, rather than for its special m

#print So far you have always appended to an empty file, so that there was no problem about where the appended lines were placed in the file. If the file you're appending to already has lines in it,

#print This program will try to help you learn how to use the editor. You should really know, before starting this, how to use files and how to type. There is a "learn files" procedure to teach you ab

#print To avoid just accumulating lines forever, you need some way of getting rid of them. The 'd' command (delete) removes lines you don't want. Since it also removes lines that you do want if you

#print Often you want to refer to the last line of a file, and you don't know how long it is. There is a special address, "$" for this purpose. "$" refers to the end of a file. Thus $p prints the l

#print Normally the 's' command only changes the first instance on a line of the expression it is looking for. Sometimes you want to change more than one instance. If you put a 'g' after the command

#print The editor and the 'shell' (the normal command interpreter) accept different commands. The shell (which types '%' at you) understands "ls", "mv", "cp", "date" and so forth; the editor understa

#print Note that usually you just type 'w' without a file name, and the editor buffer is written on the 'current file'. What is the 'current file' when you have executed an 'r' command? Well, it does