To create the standard &quot;configure&quot; script you need GNU autoconf.
You may need GNU automake and libtool too.

There are tons of documentation and howtos.
Google for something like &quot;autoconf automake howto&quot;.
The good documentation is in the official manual pages:

 - **Autoconf**: http://www.gnu.org/software/autoconf/
 - **Automake**: http://www.gnu.org/software/automake/automake.html
 - **Libtool**: http://www.gnu.org/software/libtool/libtool.html

Autoconf will create your configure script starting from the &quot;configure.ac&quot; file.
The &quot;Makefile.am&quot; file will instruct automake on how to create your makefile by the configure string. Libtool is needed to simplify libraries handling around your code.

You can start creating a configure.ac file by hand or you may use the &quot;autoscan&quot; helper that may help you to create something semi-automatic for you.

Then, when you are ready, this one will do the magic:

    autoreconf -i


there is build flow in linux  
[![enter image description here][1]][1]
and there is a very good tutorial  
https://thoughtbot.com/blog/the-magic-behind-configure-make-make-install


  [1]: https://i.stack.imgur.com/kuFHy.gif

Sometimes a software product will ship with no configure script. Look for an autogen.sh script. it will probably run:

    aclocal || die &quot;aclocal failed&quot;
    automake --add-missing --force-missing --copy --foreign || die &quot;automake failed&quot;
    autoreconf || die &quot;autoreconf failed&quot;


I added an existing ASP.Net web application project to my solution. In addition to the standard debug and release configurations this solution also has two custom configurations, SAT and UAT. For the new web application right clicking on Web.Config shows the context menu but the option for &quot;Add Config Transform&quot; is grayed out.

I&#39;m at a loss. The new project is a web application. The Configuration Manager does not show the two custom configurations for this project but it does for the other projects. The project appears to have the correct entries in the solution file.

Thoughts?



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I am new to Python and want to use its `plot` functionality to create graphs. I am using ubuntu 12.04. I followed the Python installation steps from http://eli.thegreenplace.net/2011/10/10/installing-python-2-7-on-ubuntu/ but when I do 

    from pylab import *

I am getting this error

    &gt;&gt;&gt; from pylab import *
    Traceback (most recent call last):
      File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
    ImportError: No module named pylab

My Python version is `python 2.7`. Can anybody tell me what I am missing here?


python error: no module named pylab

This may sound like a very generic question but here it goes.

I have a requirement to create a configure script for my application, the result of this configure would be a generated `makefile` (basic `configure`, `make`, `make install`). My question is, where do I start in building this? Is there an example I can follow?

How do I create a configure script?

<p>This may sound like a very generic question but here it goes.</p>
<p>I have a requirement to create a configure script for my application, the result of this configure would be a generated <code>makefile</code> (basic <code>configure</code>, <code>make</code>, <code>make install</code>). My question is, where do I start in building this? Is there an example I can follow?</p>


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&#39;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....?



 

Using bash history to get a previous command, copy it and then &#39;run&#39; it but with the command commented

I am confused about DNS caching. I am writing a small forward proxy server and want to use OS DNS cache on a Linux system.
 
If I understand correctly, then there is DNS caching at the browser level. Then there is DNS caching at OS level (Windows has it. I am not sure if Linux distros have it by default). 

So, how does a browser/proxy_server use OS DNS caching? I am trying to find if I can rely on Linux for DNS caching instead of doing it on my own inside my proxy.

Thanks

DNS caching in linux

The *alternate screen* is used by many &quot;user-interactive&quot; terminal applications like vim, htop, screen, alsamixer, less, ... It is like a different buffer of the terminal content, which disappears when the application exits, so the whole terminal gets restored and it looks like the application hasn&#39;t output anything.

I&#39;d like to achieve exactly the same thing in my own shell (bash) script, except that it doesn&#39;t have to be that portable. I&#39;d stick to linux only and xterm-based terminal emulators; but the solution should use something like `tput` if it&#39;s possible. However, I don&#39;t want to use some external scripting language (or even something like C).

Although I don&#39;t want to use C (as it should be a bash-script with as few dependencies as possible), I had a look into the source code of less. It seems to use terminfo as the database and looks up the &quot;ti&quot; terminal capability in its initialisation. When removing the line, it doesn&#39;t use the alternate sceen, so I assumed that I found the responsible code line.

However, I can&#39;t find such a capability in `man terminfo`. But maybe I&#39;m on the wrong path finding a solution for this. Maybe terminfo / tput isn&#39;t my friend.

So (how) can I use the alternate screen in a bash script? Does somebody know a simple application in which source code I may find a hint? (C application or bash script or whatever...)

Using the &quot;alternate screen&quot; in a bash script

In my home folder in Linux I have several config files that have &quot;rc&quot; as a file name extension:

    $ ls -a ~/|pcregrep &#39;rc$&#39;
    .bashrc
    .octaverc
    .perltidyrc
    .screenrc
    .vimrc

What does the &quot;rc&quot; in these names mean?

What does &quot;rc&quot; mean in dot files

I have the following setup to periodically rsync files from server A to server B. Server B has the rsync daemon running with the following configuration:

    read only = false
    use chroot = false
    max connections = 4
    syslog facility = local5
    log file = /var/adm/rsyncd.log
    munge symlinks = false
    secrets file = /etc/rsyncd.secrets
    numeric ids = false
    transfer logging = true
    log format = %h %o %f %l %b
    
    
    [BACKUP]
            path = /path/to/archive
            auth users = someuser


From server A I am issuing the following command:

    rsync -adzPvO --delete --password-file=/path/to/pwd/file/pwd.dat /dir/to/be/backedup/ someuser@192.168.100.100::BACKUP

BACKUP directory is fully read/write/execute to everyone. When I run the rsync command from server A, I see:

    afile.txt
             989 100%    2.60kB/s    0:00:00 (xfer#78, to-check=0/79)

for each and everyfile in the directory I wish to backup. It fails when I get to writing tmp files:

    rsync: mkstemp &quot;/.afile.txt.PZQvTe&quot; (in BACKUP) failed: Permission denied (13)

Hours of googling later and I still can&#39;t resolve what seems to be a very simple permission issue. Advice? Thanks in advance.

**Additional Information**

I just noticed the following occurs at the beginning of the process:

    rsync: failed to set permissions on &quot;/.&quot; (in BACKUP): Permission denied (13)

Is it trying to set permission on &quot;/&quot;?

**Edit**

I am logged in as the user - someuser. My destination directory has full read/write/execute permission for everyone, including it&#39;s contents. In addition, the destination directory is owned by someuser and in someuser&#39;s group.

**Follow up**

I&#39;ve found using SSH solves this

rsync - mkstemp failed: Permission denied (13)

I am trying to use xargs to call a more complex function in parallel.  

    #!/bin/bash
    echo_var(){
        echo $1
        return 0
    }
    seq -f &quot;n%04g&quot; 1 100 |xargs -n 1 -P 10 -i echo_var {} 
    exit 0

This returns the error

    xargs: echo_var: No such file or directory

Any ideas on how I can use xargs to accomplish this, or any other solution(s) would be welcome.

Calling shell functions with xargs

Basically, what signal does &#39;0&#39; represent, because [here][1] I see SIGNAL numbers starting from 1. 


  [1]: http://lxr.linux.no/linux+v2.6.16.60/include/asm-i386/signal.h#L34

What does `kill -0 $pid` in a shell script do?

Is it possible to store or capture stdout and stderr in *different variables*, without using a temp file?  Right now I do this to get stdout in `out` and stderr in `err` when running `some_command`, but I&#39;d
like to avoid the temp file.

    error_file=$(mktemp)
    out=$(some_command 2&gt;$error_file)
    err=$(&lt; $error_file)
    rm $error_file

Capture stdout and stderr into different variables

I see that this is the same question as

  https://stackoverflow.com/questions/4808303/making-make-print-commands-before-executing

But that answer doesn&#39;t work for me. I&#39;m guessing that answer only works with cmake. What options work without cmake?

Note tried these

    make VERBOSE=1 target
    make target VERBOSE=1
    VERBOSE=1 make target
    make V=1 target
    make target V=1
    V=1 make target
    make -V target
    make -v target

none of them worked.

make -v returns

    GNU Make 3.81
    Copyright (C) 2006  Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.
    There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
    PARTICULAR PURPOSE.
    
    This program built for x86_64-pc-linux-gnu



Making make print commands before executing when NOT using CMake

I am trying to make software install to a specific directory. I found several ways, but not sure what are the differences between them.

1. `./configure --prefix=***`
3. `make install DESTDIR=***`
4. `make install prefix=***`

I am confused about the functions of these three. Do they achieve the same goal?

DESTDIR and PREFIX of make

Code Snippet:

    target_test : test.cc 
        $(CXX) $(CPPFLAGS) $(CFLAGS) test.cc

I know that `CXX` is a variable (containing the compiler command to call), but I was wondering where this variable comes from. The variable is not defined in the makefile and is not an environment variable. Can anyone explain where the value of `CXX` comes from?

Where does the value of CXX in a makefile come from?

I need to get the nth dependency file from a rule, something similar to $n in bash. I need this because I&#39;d like to feed in individual dependency files as options to the build program.

Here&#39;s an example:

    dep.o: dep.src config1.cfg config2.cfg
        parse -cfg1 $2 -cfg2 $3 -o $@ $&lt;

Is it possible?

How to get the second dependency file using Automatic Variables in a Makefile?

I&#39;m new to this. Just wanted to ask how to compile a makefile. I am using MinGW compiler in C language. Do I have to save all my files in MinGW\bin? because right now my files are in a different directory.

Appreciate the help.

How to compile makefile using MinGW?

I&#39;m currently learning how to use the `autoconf`/`automake` toolchain.  I seem to have a general understanding of the workflow here - basically you have a `configure.ac` script which generates an executable `configure` file.  The generated `configure` script is then executed by the end user to generate `Makefile`s, so the program can be built/installed.

So the installation for a typical end-user is basically:

    ./configure
    make
    make install
    make clean

Okay, now here&#39;s where I&#39;m confused:

As a developer, I&#39;ve noticed that the auto-generated configure script sometimes won&#39;t run, and will error with:

    config.status: error: cannot find input file: `somedir/Makefile.in&#39; 

This confuses me, because I thought the configure script is supposed to *generate* the `Makefile.in`.  So Googling around for some answers, I&#39;ve discovered that this can be fixed with an `autogen.sh` script, which basically &quot;resets&quot; the state of the `autoconf` environment.  A typical `autogen.sh` script would be something like:

    aclocal \
    &amp;&amp; automake --add-missing \
    &amp;&amp; autoconf

Okay fine.  But as an end-user who&#39;s downloaded countless tarballs throughout my life, I&#39;ve *never* had to use an `autogen.sh` script.  All I did was uncompress the tarball, and do the usual configure/make/make install/make clean routine.

But as a developer who&#39;s now *using* `autoconf`, it seems that `configure` doesn&#39;t actually run unless you run `autogen.sh` first.  So I find this very confusing, because I thought the end-user shouldn&#39;t have to run `autogen.sh`. 

So why do I have to run `autogen.sh` first - in order for the configure script to find `Makefile.in`?  Why doesn&#39;t the configure script simply generate it?


Confused about configure script and Makefile.in

I&#39;m trying to compile Python 3.6 on an arm based Linux machine, 
`./configure` outputs this:

&gt; If you want a release build with all optimizations active (LTO, PGO, etc),
please run `./configure --enable-optimizations`.

what does `--enable-optimizations` do?


Content Type	Original Author	Original Content on Stackoverflow
Question	godzilla	View Question on Stackoverflow
Solution 1 - Linux	dAm2K	View Answer on Stackoverflow
Solution 2 - Linux	hamSh	View Answer on Stackoverflow
Solution 3 - Linux	Alan Jurgensen	View Answer on Stackoverflow

How do I create a configure script?

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python error: no module named pylab

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