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#print Sometimes it is desirable to add text before a known line, rather than after it. For this purpose there is an 'i' (insert) command that places the new material before the specified line. Other

#print So far you have always dealt with one file at a time. Suppose you wanted to combine two files - there is nothing we have covered so far that will do that. But the editor does have a command '

#print You have now learned quite a bit about substitute commands. Here is a larger task to perform. There is a file 'song' in this directory. Edit it; print it out, and notice that there are six mi

#print The editor accepts commands one per line, just like the other programs in UNIX; but its commands are unique to it. Like the normal command interpreter, the editor has a prompt sign to let you k

#print The '*' character is also used in the editor patterns (the regular expressions) but it has quite a different meaning from '*' as used in filenames. In the editor it means "any number of repeti

#print Remember that "$" is the last line in the current file. Suppose you want to know how long the file is, i.e. what the number of the last line is. The command $= will tell you that. So you c

#print A time-saving feature of context searches is that the editor remembers the last regular expression mentioned, and if you just say // or ?? with no expression, it assumes the same one. Thus /a

#print After the global command has selected the lines to which the second command is to be applied, it sets '.' (the current line) to each of these lines in turn as it executes the controlled command

#print So far you have learned how to copy and print existing files, and now you probably want to know how to add new text to a file. The "a" (append) command lets you do that. For example, the sequ

#print One thing you must be careful of is that the substitute command does not know about word boundaries. It will change the first occurrence of a letter string it matches without regard to blanks