You can type 'm' followed by the same C-x ~ to do that. Suppose you now want to quickly list all the users on the system starting with 'm'. Hit C-x ~ and read-line will attempt username completion and output all the usernames to the terminal.Īdm catonmat ftp halt mailnull nobody root smmsp vcsaĪpache cpanel games lp mysql nscd rpc sshdīin daemon gopher mail named operator rpm syncĬat dbus haldaemon mailman news picurls shutdown uucp Suppose you want to quickly list all the users on the system. To put the found command on command line for editing hit C-j. Hitting C-r again will locate any other command which matches your typed text. Typing a part of the arguments you remember, will locate the previously executed command matching the typed text.
If you hit C-r readline will put you in an incremental reverse history search mode. You want to find this command and call it with a few arguments modified. Suppose you used a pretty complex command a while ago and now you remember just a few arguments of this command. Other shortcuts of interest are M-f to move forward and C-a, and C-e to move to the beginning and end of line. The numeric-argument can also be negative, which makes the argument to be applied in the opposite direction. The M-b command calls backward-word function which does the obvious. If you look up on the cheat sheet what M-3 does, it sets the numeric-argument to 3 which in this case acts as a counter how many times should M-b command be repeated. If you hit M-3 followed by M-b, you would end up exactly where you wanted:Īn alternative is to hit M-b three times in a row: M-b M-b M-b $ echo word1 word2 word3 word4 word5 word6 Suppose you are at the end of the line and want to move 3 words backwards. Let ' ' be the position of cursor in all the examples.
#Emacs editors how to
Here are a few examples with screenshots on how to use this editing mode. This is a cheat sheet for the default, emacs, editing mode. I have mastered both of the editing modes and have created cheat sheets for both of them (and a tiny separate one for readline's history expansion). Both emacs and vi editing modes are available.
The readline library also includes functions to maintain a list of previously-entered command lines, to recall and perhaps reedit those lines, and perform csh-like history expansion on previous commands. The GNU Readline library provides a set of functions for use by applications that allow users to edit command lines as they are typed in. One of the most popular shells, bash - Bourne Again SHell, uses GNU's Readline library for reading the command line. When you are working in a shell you certainly don't want to waste your time using arrow keys or home/end keys to navigate around the command line.
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