It&#39;s the dollar sign, in makefiles you&#39;ll have to type `$$` to get a single dollar sign:

    M_ARCH := $(shell g++ -dumpmachine | awk &#39;{split($$1,a,&quot;-&quot;);print a[1]}&#39;)

Make is quite lispy when you get down to it. Here&#39;s a non-awk version that does the same thing:

    space := $() #
    
    M_ARCH := $(firstword $(subst -,$(space),$(shell g++ -dumpmachine)))
    
    all:
    	$(info $(M_ARCH))


This is related to the question I asked here:
https://stackoverflow.com/questions/2382329/how-can-i-get-browser-to-prompt-to-save-password

This is the problem: I CAN&#39;T get my browser to prompt me to save the password for the site I&#39;m developing. (I&#39;m talking about the bar that appears sometimes when you submit a form on Firefox, that says &quot;Remember the password for yoursite.com? Yes / Not now / Never&quot;)

This is super frustrating because this feature of Firefox (and most other modern browsers, which I hope work in a similar fashion) seems to be a mystery. It&#39;s like a magic trick the browser does, where it looks at your code, or what you submit, or something, and if it &quot;looks&quot; like a login form with a username (or email address) field and a password field, it offers to save.

Except in this case, where it&#39;s not offering my users that option after they use my login form, and it&#39;s making me nuts. :-)

(I checked my Firefox settings-- I have NOT told the browser &quot;never&quot; for this site. It should be prompting.)

My question
-----------

What are the heuristics that Firefox uses to know when it should prompt the user to save? This shouldn&#39;t be too difficult to answer, since it&#39;s right there in the Mozilla source (I don&#39;t know where to look or else I&#39;d try to dig it out myself). I&#39;ve also had no luck finding a blog post or some other similar developer note from the Mozilla developers about this.

(I would be fine with this question being answered for Safari or IE; I would imagine that all the browsers user very similar rules, so if I can get it working in one of them, it will work in the others.)

(* Note that if your answer to me has anything to do with cookies, encryption or anything else that is about how I&#39;m storing passwords in my local database, odds are strong that you have misunderstood my question. :-)

How does browser know when to prompt user to save password?

Is there any built-in method in Java to find the size of any datatype?
Is there any way to find size?



Is there any sizeof-like method in Java?

I&#39;m trying to do this in a makefile and it fails horribly:

    M_ARCH := $(shell g++ -dumpmachine | awk &#39;{split($1,a,&quot;-&quot;);print a[1]}&#39;)

do you know why? I guess it has to do with escaping, but what and where?

Escaping in makefile

I'm trying to do this in a makefile and it fails horribly:
<pre><code class="hljs language-makefile">M_ARCH := $(shell g++ -dumpmachine | awk '{split($1,a,"-");print a[1]}')
</code></pre>
do you know why? I guess it has to do with escaping, but what and where?

I&#39;m creating a bot in Shell Script:

    # Array with expressions
    expressions=(&quot;Ploink Poink&quot; &quot;I Need Oil&quot; &quot;Some Bytes are Missing!&quot; &quot;Poink Poink&quot; &quot;Piiiip Beeeep!!&quot; &quot;Hello&quot; &quot;Whoops! I&#39;m out of memmory!&quot;)
    
    # Seed random generator
    RANDOM=$$$(date +%s)
    
    # Loop loop loop loop loop loop ...
    while [ 1 ]
    do
        # Get random expression...
        selectedexpression=${expressions[$RANDOM % ${#RANDOM[*]}]}
        
        # Write to Shell
        echo $selectedexpression
        
        
        # Wait an half hour
        sleep 1 # It&#39;s one second for debugging, dear SOers
    done

I want that it prints a random item from the `expressions` every second. I tried this but it does not work. It only prints the first one (Ploink Poink) every time. Can anyone help me out?
Thanks

How to select a random item from an array in shell

How would I do something like:
    
    ceiling(N/500)
N representing a number.

But in a linux Bash script

Get ceiling integer from number in linux (BASH)

How would I round the result from two divided numbers, e.g.

    3/2

As when I do 

    testOne=$((3/2))
$testOne contains &quot;1&quot; when it should have rounded up to &quot;2&quot; as the answer from 3/2=1.5

Round a divided number in Bash

I have a text file containing unwanted null characters (ASCII NUL, `\0`). When I try to view it in `vi` I see `^@` symbols, interleaved in normal text. How can I:

1. Identify which lines in the file contain null characters? I have tried grepping for `\0` and `\x0`, but this did not work.

2. Remove the null characters? Running `strings` on the file cleaned it up, but I&#39;m just wondering if this is the best way?

Identifying and removing null characters in UNIX

I tried to redirect the output of the time command, but I couldn&#39;t:
     
    $time ls &gt; filename
    real    0m0.000s
    user    0m0.000s
    sys     0m0.000s

In the file I can see the output of the `ls` command, not that of `time`.
Please explain, why I couldn&#39;t and how to do this.

How can I redirect the output of the &quot;time&quot; command?

Let&#39;s say I have a makefile with the rule

    %.o: %.c
     gcc -Wall -Iinclude ...

I want *.o to be rebuilt whenever a header file changes. Rather than work out a list of dependencies, whenever any header file in `/include` changes, then all objects in the dir must be rebuilt. 

I can&#39;t think of a nice way to change the rule to accomodate this, I&#39;m open to suggestions. Bonus points if the list of headers doesn&#39;t have to be hard-coded 

Makefile, header dependencies

I&#39;m having trouble with the linking of my files.

Basically, my program consists of:

 - The main program, `gen1`.
 - `gen1` - receives input sends to `str2value` for
   processing, outputs results `str2value`, breaks input into tokens
   using &quot;tokenizer&quot; determines what sort of processing to do to each
   token, and passes them off to `str2num`, or `str2cmd`. It then returns an
   array of the results.
 - `str2num` - does some processing
 - `str2cmd` - ditto
 - `author.py` - a python script that generates `str2cmd.c` and `str2cmd.h` from a header `cmdTable.h`.


I&#39;m pretty sure I have my includes right, I&#39;ve checked a couple of times. I&#39;ve also checked that there are no conditions `#ifndef` wrong in the headers.


Here is my Makefile:

    #CPP = g++ -lserial
    CPP = g++ -DTESTMODE
    C= gcc
    DEFINES = LURC
    CFLAGS = -Wall -fshort-enums -D$(DEFINES)
    PROJECTFILES = gen1.cpp str2value.o
    
    STR2VALUEFILES = str2value.cpp str2cmd.o str2num.o tokenizer.o str2value.h
    
    gen1 : $(PROJECTFILES)
            $(CPP) $(CFLAGS) -o gen1 $(PROJECTFILES)
    
    
    
    str2value.o : $(STR2VALUEFILES)
    #       echo &quot;str2value&quot;
            $(CPP) $(CFLAGS) -c $(STR2VALUEFILES)
    
    str2num.o: str2num.cpp  str2value.h str2num.hpp
             $(C) $(CFLAGS) -c $^
    
    
    tokenizer.o: tokenizer.cpp tokenizer.hpp
            $(CPP) $(CFLAGS) -c $^
    
    str2cmd.o : authorCMDs.py cmdTable.h
            python authorCMDs.py cmdTable.h str2cmd #this uses the gcc -E cmdTable.h -DLURC
            $(C) $(CFLAGS) -c str2cmd.c str2cmd.h
    
    #TODO: add a thing that checks str2cmd.h/.c has not been modified by hand
   
    
    
    .PHONEY: clean
    clean:
            rm *.o
    
    .PHONEY: all
    all:
            clear
            make clean
            make

Here is the output I recieve from make all:

    make clean
    make[1]: Entering directory `/home/frames/LURC/gen1/gen1Source&#39;
    rm *.o
    make[1]: Leaving directory `/home/frames/LURC/gen1/gen1Source&#39;
    make
    make[1]: Entering directory `/home/frames/LURC/gen1/gen1Source&#39;
    python authorCMDs.py cmdTable.h str2cmd #this uses the gcc -E cmdTable.h -DLURC
    str2cmd.c and str2cmd.h, generated from cmdTable.h
    
    gcc  -Wall -fshort-enums -DLURC -c str2cmd.c str2cmd.h
    gcc  -Wall -fshort-enums -DLURC -c str2num.cpp str2value.h str2num.hpp
    g++ -DTESTMODE -Wall -fshort-enums -DLURC -c tokenizer.cpp tokenizer.hpp
    g++ -DTESTMODE -Wall -fshort-enums -DLURC -c str2value.cpp str2cmd.o str2num.o tokenizer.o str2value.h
    g++: str2cmd.o: linker input file unused because linking not done
    g++: str2num.o: linker input file unused because linking not done
    g++: tokenizer.o: linker input file unused because linking not done
    g++ -DTESTMODE -Wall -fshort-enums -DLURC -o gen1 gen1.cpp str2value.o
    str2value.o: In function `getValue(char*)&#39;:
    str2value.cpp:(.text+0xbd): undefined reference to `str2cmd(char*)&#39;
    str2value.cpp:(.text+0x102): undefined reference to `str2num(char*)&#39;
    str2value.o: In function `getAllValues(char*)&#39;:
    str2value.cpp:(.text+0x164): undefined reference to `tokenizer::tokenizer(char*)&#39;
    str2value.cpp:(.text+0x177): undefined reference to `tokenizer::getNumTokens(char const*)&#39;
    str2value.cpp:(.text+0x1a9): undefined reference to `tokenizer::getNextToken(char const*)&#39;
    str2value.cpp:(.text+0x1e9): undefined reference to `tokenizer::getNumTokens(char const*)&#39;
    str2value.cpp:(.text+0x201): undefined reference to `tokenizer::~tokenizer()&#39;
    str2value.cpp:(.text+0x25b): undefined reference to `tokenizer::~tokenizer()&#39;
    collect2: ld returned 1 exit status
    make[1]: *** [gen1] Error 1
    make[1]: Leaving directory `/home/frames/LURC/gen1/gen1Source&#39;
    make: *** [all] Error 2

Any suggestions about what this is about? `STR2VALUESFILES` has all the object files I need, to define the missing functions.

Linker error: &quot;linker input file unused because linking not done&quot;, undefined reference to a function in that file

We are required to use a Makefile to pull everything together for our project, but our professor never showed us how to.

I only have *one* file, `a3driver.cpp`. The driver imports a class from a location, `&quot;/user/cse232/Examples/example32.sequence.cpp&quot;`.

That&#39;s it. Everything else is contained with the `.cpp`.

How would I go about making a simple Makefile that creates an executable called `a3a.exe`?



How to make a SIMPLE C++ Makefile

It&#39;s been a while since I&#39;ve used `make`, so bear with me...

I&#39;ve got a directory, `flac`, containing .FLAC files. I&#39;ve got a corresponding directory, `mp3` containing MP3 files. If a FLAC file is newer than the corresponding MP3 file (or the corresponding MP3 file doesn&#39;t exist), then I want to run a bunch of commands to convert the FLAC file to an MP3 file, and copy the tags across.

The kicker: I need to search the `flac` directory recursively, and create corresponding subdirectories in the `mp3` directory. The directories and files can have spaces in the names, and are named in UTF-8.

And I want to use `make` to drive this.


Recursive wildcards in GNU make?

I have a Makefile from which I want to call another external bash script to do another part of the building. How would I best go about doing this?  

How to run a bash script from a Makefile?

How can I escape the equals sign (`=`) in Java property files? I would like to put something as the following in my file:

    table.whereclause=where id=100

How to escape the equals sign in properties files

Here is how I&#39;m currently converting **XMLDocument** to **String**

    StringWriter stringWriter = new StringWriter();
    XmlTextWriter xmlTextWriter = new XmlTextWriter(stringWriter);
    
    xmlDoc.WriteTo(xmlTextWriter);
    
    return stringWriter.ToString();

The problem with this method is that if I have **&quot;** ((quotes) which I have in attributes) it escapes them.

For Instance:

    &lt;Campaign name=&quot;ABC&quot;&gt;
    &lt;/Campaign&gt;
Above is the expected XML. But it returns

    &lt;Campaign name=\&quot;ABC\&quot;&gt;
    &lt;/Campaign&gt;

I can do **String.Replace &quot;\&quot;** but is that method okay? Are there any side-effects? Will it work fine if the XML itself contains a **&quot;\&quot;**

Convert XmlDocument to String

I want to grep for the string that starts with a dash/hyphen, like `-X`, in a file, but it&#39;s confusing this as a command line argument. 

I&#39;ve tried:

    grep &quot;-X&quot;
    grep \-X
    grep &#39;-X&#39;


How can I grep for a string that begins with a dash/hyphen?

How can I escape a `&#39;` (single quote) in HTML?

This is where I&#39;m trying to use it:

    &lt;input type=&#39;text&#39; id=&#39;abc&#39; value=&#39;hel&#39;lo&#39;&gt;

The result for the above code is &quot;hel&quot; populated in the text box. I tried to replace `&#39;` with `\&#39;`, but this what I&#39;m getting.

    &lt;input type=&#39;text&#39; id=&#39;abc&#39; value=&#39;hel\&#39;lo&#39;&gt;

The result for the above code is &quot;hel\&quot; populated in the text box.

How can I successfully escape the single quotes?


How can I escape a single quote?

What is difference between `&#39;aa&#39;` and `&#39;\xaa&#39;`? What does the `\x` part mean? And which chapter of the Python documentation covers this topic?

Content Type	Original Author	Original Content on Stackoverflow
Question	Jonas Byström	View Question on Stackoverflow
Solution 1 - Shell	Martin	View Answer on Stackoverflow
Solution 2 - Shell	richq	View Answer on Stackoverflow

Escaping in makefile

Shell Problem Overview

Shell Solutions

Solution 1 - Shell

Solution 2 - Shell

Is there any sizeof-like method in Java?

How does browser know when to prompt user to save password?

Attributions