Enjoy :-)

$ find -name '*.c' | xargs emacs
or
$ grep -rl snmp . | xargs emacs

and got the error “emacs: standard input is not a tty” ?

That’s normal, as the stdin for emacs is here the pipe, not your tty, you need a workaround to leave the normal stdin to your emacs.

There are different approches, the one I used for a long time was a command substitution :

$ emacs $(find -name '*.c')

But other approches exists, redirecting /dev/tty to emacs’ stdin :

$ find -name '*.c' | xargs sh -c 'emacs "$@" < /dev/tty' emacs

And if you are searching for a specific pattern with grep, you should want to jump directly to the right line using the ‘+line file’ syntax of emacs, and the shell substitution :

$ emacs $(grep -rn snmp services/ | sed -r 's/([^:]*):([0-9]*):.*/+\2 \1/g')

It’s good while having only one occurence of the pattern in each file, but if many occurences exists, the file is oppened only once, with a while you can open one emacs for each occurence of the searched pattern and the /dev/tty redirection :

$ grep -rn snmp services/ | sed -r 's/([^:]*):([0-9]*):.*/+\2 \1/g' | while read line file; do emacs $line $file < /dev/tty; done

So I searched and found a PHP version on Jon’s blog but I don’t like PHP and don’t want a PHP cli on my machine (even to start screen !)

So I rewrote it in bash (not sh, bash, to have brace expansion !)

Enjoy :

#!/bin/bash -f
 
SCREEN_NAME=julien
SERVERS=$(echo {julien,root}@dev root@{www,sql}{1,2} root@media{1,2,3,4,5,6}
 
 
 
 
screen -dmS "$SCREEN_NAME"
NUM=0
for SERVER in $SERVERS
do
    NUM=$((NUM + 1))
    screen -S "$SCREEN_NAME" -X screen
    if [ z"$SERVER" != z"" ]
    then
        screen -S "$SCREEN_NAME" -p $NUM -X title "$SERVER"
        screen -S "$SCREEN_NAME" -p $NUM -X stuff "ssh $SERVER $(printf \\r)"
    fi
done
printf "Done,  now you can join your screen with :\n"
printf "$ screen -dr -S $SCREEN_NAME\n"

Don’t forgot to start your ssh-agent just before starting this script !

PS : If you don’t have a ssh-agent, you may want to remove the $(printf \\r) and press enter yourself.

Basically, you want a `top` (or logtop ;-) ) to be displayed in your website back office ? But top outputs in your terminal and you don’t know how to capture it ? Use ashttp, like this :

$ ashttp -p 8080 top

And then just open the port 8080 with an HTTP client and enjoy (typing some F5…) :

You can find the code on my github.

The ONLY trick I found to force squid to use IPv4 (After disabling IPv6 on the interface, after disabling IPv6 in the kernel that leads to nothing better…) is :


tcp_outgoing_address [YOUR PUBLIC IP HERE]


And can enjoy again living on you old IPv4 network !

First you should learn about flymake-mode here : http://www.emacswiki.org/emacs/FlyMake
In a nutshell Flymake is a minor mode to perform on the fly checks on your files. It can run any external syntax checker by different means, I let you check out the documentation.

Quick and easy setup to highlight C syntax :
You already have a Makefile, that’s good, so you just have to add a new rule to your Makefile, named ‘check-syntax’ :

check-syntax:
    gcc -o /dev/null -D$(DEFINE) $(CFLAGS) -S ${CHK_SOURCES}

You can fix my -D$(DEFINE) $(CFLAGS) to match your compile options …
Then open a .c file in your project, and if you .emacs file don’t automatically start flymake-mode, type ‘M-x flymake-mode’ and enjoy error highlighting !

Next trick is, if you’re using a non graphical emacs, you don’t have, by default, the error message, so i’s a bit anying…
So you’ll add some lines in you .emacs and a file in you .emacs.d
First, download flymake-cursor.el here http://www.emacswiki.org/emacs/download/flymake-cursor.el and put it in your ~/.emacs.d/
Then in your .emacs, add :

(require 'cl)
(require 'flymake-cursor)

Now, when you stop your cursor on an error, the message should appear in the minibuffer.

Last trick, for Python developers, how to use flymake-mode with pyflakes ?
Just add this to you .emacs file, and tweak it if you want. You should install pyflakes in order to make it work.

;; aptitude install pyflakes to check python code                                                                                                                                  
(require 'flymake-cursor)
(global-set-key [f4] 'flymake-goto-next-error)
 
(when (load "flymake" t)
  (defun flymake-pyflakes-init ()
    (let* ((temp-file (flymake-init-create-temp-buffer-copy
                       'flymake-create-temp-inplace))
           (local-file (file-relative-name
                        temp-file
                        (file-name-directory buffer-file-name))))
      (list "pyflakes" (list local-file))))
 
  (add-to-list 'flymake-allowed-file-name-masks
               '("\\.py\\'" flymake-pyflakes-init)))
 
(add-hook 'find-file-hook 'flymake-find-file-hook)

Bonus trick you should try :
Replace “pyflakes” in (list “pyflakes” (list local-file)))) to a shell script of you own, running pyflakes, pep8, etc…as I just found here :
http://stackoverflow.com/questions/1259873/how-can-i-use-emacs-flymake-mode-for-python-with-pyflakes-and-pylint-checking-cod

#!/bin/bash
 
epylint "$1" 2>/dev/null
pyflakes "$1"
pep8 --ignore=E221,E701,E202 --repeat "$1"
true

Enjoy !

Function name : isearch-forward
Typical Key sequence : C-s
How to get help : C-h f isearch-forward
Usage : isearch-forward let you type a string to be searched incrementally in the current buffer, successive following C-s will jump to the next match.

Function name : isearch-forward-regexp
Typical Key sequence : C-M-s or C-u C-s
How to get help : C-h f isearch-forward-regexp
Usage : isearch-forward-regexp let you type a regexp to be searched incrementally in the current buffer, successive following C-s will jump to the next match.

Function name : query-replace
Typical Key sequence : M-%
How to get help : C-h f query-replace
Usage : M-% search RET replace RET
Then, for each term found, query-replace will ask you what to do : space or y to replace, delete or n to skip, RET or q to exit, ! for ‘yes for all’, ? to get help about how to enter recursive edit / delete match and recursive edit / edit replacement string / …

Then you should read about replace-string, replace-regexp, occur, list-matching-lines, multi-occur, multi-occur-in-matching-buffers, how-many, flush-lines, and keep-lines.

Case sensitivity :
A search is by defaut case insensitive, but if you input an upper case letter, it become case sensitive. M-c during a search toggle the case sensitivity.

Configuration variables :
You may consult the documentation about those variable typing :
C-h v variable
or
M-x apropos-variable RET case-fold-search RET

• case-fold-search (Non-nil if searches and matches should ignore case.)
• default-case-fold-search (Default value of `case-fold-search’)
• tags-case-fold-search (Whether tags operations should be case-sensitive.)

Function name : universal-argument
Typical Key sequence : C-u
How to get help : C-h f universal-argument
Usage : C-u receive a numeric argument that is given to the next called function, when no numeric argument is typed, the value defaults to 4.

So today you can try :
C-u 9 C-n # that move cursor vertically down 9 lines
C-u C-k # that kills 4 lines
C-u C-u C-k # that kills 4 * 4 = 16 lines
C-u 10 n # that enters nnnnnnnnnn
You may ask, what about if I want to input 25 ’6′ ? C-u 256 can’t work … so you just have to separate with another C-u :
C-u 25 C-u 1 # enters 6666666666666666666666666

Some functions does not have the simple ‘repeating’ effect of receiving a numeric parameter, for example, running C-u C-l does not recenter 4 times your screen ! but the help page of recenter-top-bottom states that :
> A prefix argument is handled like `recenter’:
> With numeric prefix ARG, move current line to window-line ARG.
> With plain `C-u’, move current line to window center.

A negative argument to C-l move the current line to the line ARG from the bottom of the screen.

Your NFS client, trying to mount the NFS share will use RPC to communicate with the serveur, il will go like :

> PORTMAP GETPORT(Program: NFS, Version: 3, Proto: TCP)
< PORTMAP Port: 2049
> PORTMAP GETPORT(Program: MOUNT, Version: 3, Proto: TCP)
< PORTMAP Port 49066
> MOUNT MNT(Program Version: 3, Path: /srv/nfsroot/ )
< MOUNT Reply error 2, "remote can't support version #", Program Version (Minimum): 1, Program Version (Maximum): 2

You can see that the response is "remote can't support version #" and we should have found this solution in the RFC 1831 (RPCv2) stating :

  Given that a call message was accepted, the following is the status
   of an attempt to call a remote procedure.

      enum accept_stat {
         SUCCESS       = 0, /* RPC executed successfully             */
         PROG_UNAVAIL  = 1, /* remote hasn't exported program        */
         PROG_MISMATCH = 2, /* remote can't support version #        */
         PROC_UNAVAIL  = 3, /* program can't support procedure       */
         GARBAGE_ARGS  = 4, /* procedure can't decode params         */
         SYSTEM_ERR    = 5  /* errors like memory allocation failure */
      };

So the problem is you client is asking for a NFS version greater that your server runs … but if your server is running NFS v3, check a `ps aux | grep [r]pc.mountd` for :

root 1411 0.0 0.0 18808 1036 ? Ss Apr15 0:00 /usr/sbin/rpc.mountd –manage-gids –no-nfs-version 3

Did you catch the –no-nfs-version 3 ? If your server is compiled with NFSv3 support, drop the –no-nfs-version 3 in your configuration and it should work !

Enjoy !