How can I make the scala interactive shell program behave this way (using the up-arrow to go to the last command if I haven't typed anything or go to the last command given in the shell beginning with what I typed) instead of the reverse-i-search?
The Scala REPL uses JLine for readline functionality, and current versions support these .inputrc mappings:
## arrow up
"\e[A":history-search-backward
## arrow down
"\e[B":history-search-forward
and they work as you describe, enter a line prefix then up-arrow.
Probably the clunky :h? command can be retired. Or I guess that finds text anywhere on a line. :history line numbers are still useful for :edit 2463+10.
Related
I'd like to evaluate a bash script line by line. I also might want to jump back and execute a previous line again.
As described in How execute bash script line by line? , one could use the built-in debugging option -x, but this is not very handy, since you don't have the overview of previous and future commands.
For writing software in R, I used RStudio. The editor allows to evaluate the current line as an R-Command by hitting Ctrl+Enter. Afterwards the result is shown in a built-in shell, and the Cursor jumps to the next command.
Is there a simple text-editor (like gedit) that allows to send the current line to a built-in shell/console (bash, zsh,...) and view the result of the evlauation afterwards in the shell?
It's not built in to Emacs, but it's easy to do.
(defun shell-eval-line (pos)
"Evaluate the line around position as a shell command.
In interactive mode, use the cursor's position."
(interactive "d")
(save-excursion
(goto-char pos)
(shell-command (buffer-substring
(line-beginning-position) (line-end-position))) ))
Bind to a key of your liking (C-c ! maybe?) and go.
Add a (next-line) outside the (save-excursion) to make it advance to the next line when it's done, or create a simple macro around it to invoke the function and jump to the next line.
You can also do it with the editor geany. In their Wiki they have a detailed instruction. In short:
Install geany
Open the file ~/.config/geany/geany.conf and set send_selection_unsafe=true
Restart geany
Set a key-binding Edit > Preferences > Keybindings (It is under Format / Send selection to terminal)
Actually you don't have to select the code you want to send. So far I couldn't find out how to instruct geany to jump to the next line afterwards.
In Vim there is a command to place the line where the cursor is on the top of the window... that is:
z-Enter
I know there is an equivalent but C-l (L) did not do it, it did what z-z does on vim.
Anybody?
EDIT: Specifying OS and versions
I'm running GNU Emacs 22.1.1 in OS X 10.9.3 and already tried C-l repeatedly without luck.
Recent Emacs
Since 2007-11-16 (Emacs 22.2), you need to hit C-l several times because it cycles between different positionings:
C-l runs the command recenter-top-bottom (found in global-map), which
is an interactive compiled Lisp function in `window.el'.
It is bound to C-l.
(recenter-top-bottom &optional ARG)
Move current buffer line to the specified window line. With no prefix
argument, successive calls place point according to the cycling order
defined by `recenter-positions'.
A prefix argument is handled like recenter': With numeric prefix
ARG, move current line to window-line ARG. With plainC-u', move
current line to window center.
Older Emacs
Are you sure you want to keep using an 6+ year old release?
In evil-mode, which combines the best of both worlds, you can also use z-Enter (or z-t).
Just a question to improve my bash skills. I always do this:
$ history | grep some_long_command
...
...
123 some_long_command1.........
124 some_long_command2.........
...
I can then run the command the command I found by doing:
!123
However, I often want to do this:
some_long_command1foobar
I.e. change the command before I run it. Can you use bash to run this command instead:
#some_long_command1
so it gets commented.
Then I don't have to use my mouse to highlight the command, edit it and then run it (I can just use the keyboard - faster).
I suppose I could write a script to do it but there might already be functionality built in somewhere....?
I'd suggest instead of using the history command, you use ctrl+r and start typing that command. When you press an arrow key as if to go to modify it, it will drop out of autocomplete recognition, and will let you edit before running.
UPDATE: also, if you want to cycle through the different commands that contain the string you just typed, keep on pressing ctrl+r
Actually, you can just append :p to the command to print it without actually running it. For example:
$ ls -la
$ !!:p
Will print out ls -la as the previous command without running it, and you can just press ā (up) to find it and edit it.
You can also do
!123:p
to print out the 123rd command as your previous command.
You can also try fc command to edit the command in the history.
WIKI says,
āfcā is a standard program on Unix that lists or edits and reexecutes,
commands previously entered to an interactive shell. fc is a built-in
command in the bash shell; help fc will show usage information.
Apart from reverse-incremental search(Ctrl+R), we have some more bash shortcuts:
From man bash:
previous-history (C-p)
Fetch the previous command from the history list, moving back in the list.
next-history (C-n)
Fetch the next command from the history list, moving forward in the list.
beginning-of-history (M-<)
Move to the first line in the history.
end-of-history (M->)
Move to the end of the input history, i.e., the line currently being entered.
reverse-search-history (C-r)
Search backward starting at the current line and moving 'up' through the history as necessary. This is an incremental search.
forward-search-history (C-s)
Search forward starting at the current line and moving 'down' through the history as necessary. This is an incremental search.
non-incremental-reverse-search-history (M-p)
Search backward through the history starting at the current line using a non-incremental search for a string supplied by the user.
non-incremental-forward-search-history (M-n)
Search forward through the history using a non-incremental search for a string supplied by the user.
yank-nth-arg (M-C-y)
Insert the first argument to the previous command (usually the second word on the previous line) at point. With an argument n, insert the nth word from the previous command (the words in the previous command begin with word 0). A negative argument inserts the nth word from the end of the previous command. Once the argument n is computed, the argument is extracted as if the "!n" history expansion had been specified.
yank-last-arg (M-., M-_)
Insert the last argument to the previous command (the last word of the previous history entry). With an argument, behave exactly like yank-nth-arg. Successive calls to yank-last-arg move back through the history list, inserting the last argument of each line in turn. The history expansion facilities are used to extract the last argument, as if the "!$" history expansion had been specified.
shell-expand-line (M-C-e)
Expand the line as the shell does. This performs alias and history expansion as well as all of the shell word expansions. See HISTORY EXPANSION below for a description of history expansion.
history-expand-line (M-^)
Perform history expansion on the current line. See HISTORY EXPANSION below for a description of history expansion.
insert-last-argument (M-., M-_)
A synonym for yank-last-arg.
operate-and-get-next (C-o)
Accept the current line for execution and fetch the next line relative to the current line from the history for editing. Any argument is ignored.
edit-and-execute-command (C-xC-e)
Invoke an editor on the current command line, and execute the result as shell commands.
!123:gs/old/new/
Will run command 123 replacing the string 'old' with the string 'new'.
You can get to edit mode by hitting M-^ (option-shift-6 on a mac).
Type this:
!123M-^
And you'll be editing command #123. It's sort of like using ctrl-r, but starting with exclamation-point syntax.
Instead of using the history command, bind history-search-backward/history-search-forward to key shortcuts which can be remembered easily (I prefer PgUp/PgDown). To do that, put this into your .inputrc file:
"<key code>": history-search-backward
"<key code>": history-search-forward
To get <key code>, type Ctrl-V <key> in the shell, and replace the starting ^[ with \e in whatever was output.
After this is set up, you can just type some and press PgUp to get some_long_command. If you need some_long_command with_some_arg but there is a similar command some_long_command with_some_other_arg later in the history, you can cycle through until you reach it by typing some and then hitting PgUp repeatedly, or you can type some, hit PgUp, move the cursor to where the two commands start to differ, type a few characters and hit PgUp once more. This ability to quickly page through / differentiate between similar commands makes it in my opinion a much more comfortable tool than Ctrl-R.
You can also put
shopt -s histverify
in your .bash_profile, which causes any history expansion to appear on your command line without running it, allowing you to edit before doing so.
You may wan to try "suggest box"-like history https://github.com/dvorka/hstr - it reads Bash history and allows for quick navigation.
To get the last command simply type hh, navigate to the command and use right arrow to get it on command line (where you can edit it and/or add comment).
^p to get the last typed command in unix/solaris
Put
alias r='fc -s'
in your .bashrc (home dir)
then you can just type in
r <whatever>
at the command prompt and you will execute a copy of the last <whatever> command (same params) that is in your history. just hit up arrow to see what you have executed if you feel the need.
Is there a function on one of the linux shells like the emacs dabbrev-expand?
First to give a definition:
M-xdescribe-functionEnterdabbrev-expandEnter
...
Expands to the most recent, preceding word for which this is a prefix.
Given that bash seems to be most heavily influenced by Emacs, looking there first reveals a few possibilities:
man bash(1), readline section
dynamic-complete-history (M-TAB)
Attempt completion on the text before point, comparing the text
against lines from the history list for possible completion matches.
dabbrev-expand
Attempt menu completion on the text before point, comparing the text
against lines from the history list for possible completion matches.
By default (or my system at least), M-/ is already bound to complete-filename:
$ bind -l | grep /
"\e/": complete-filename
You could re-bind it by putting
"\e/": dabbrev-expand
in your ~/.inputrc or /etc/inputrc.
Note that it only seems to complete the first word (the command), and only from history, not from the current command line as far as I can tell.
In zsh, I can't see anything in the man page that does this, but it should be possible to make it happen by figuring out the appropriate compctl command (Google mirror).
In vim (and bash), you can specify alternatives in filenames, eg:
:arga project/html/{index,sitemap}.html
This expands to "project/html/index.html" and "project/html/sitemap.html" (the :arga appends them both to the argument list; you can get to them with :n).
Now, vim already does some filename completion on this, with TAB, by cycling through the possibilities. For the above example, it would show the index one, then the sitemap one, then back to the original text.
I to be able to type this much:
:arga project/html/{in
and press TAB, and have it complete (even though I'm in the middle of a brace):
:arga project/html/{index.html
and have tab-completion also work for the next one, from project/html/{index.html,sit to project/html/{index.html,sitemap.html.
Is there already an option in vim to do this? If not, how would you implement it?
If this is possible, you'll have to define your own :Arga command and to specify your own expansion function. However as vim has a few things hard-coded in regard of command-line completion, I can't guaranty you that this is possible.
You can have a look at my :SearchIn* commands for examples.