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Using ls to list directories and their total sizes

Is it possible to use ls in Unix to list the total size of a sub-directory and all its contents as opposed to the usual 4K that (I assume) is just the directory file itself? ...
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javac : command not found

I have installed java in my CentOS release 5.5 machine using the command yum install java . But I am unable to compile a class using javac. ...
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How can I switch to a tag/branch in hg?

I followed the documentation in https://developer.mozilla.org/En/Developer_Guide/Source_Code/Mercurial and downloaded FF source with: ...
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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])

...to do "and" tests. I wanted to make sure an argument existed which was working well with [ -e $VAR ] , but it turns out that was also evaluating as true on an empty string; which I do not want. ...
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How do I update an NPM module that I published?

... Change the version in your package.json or use npm version <new-version>. After changing the version number in your package.json, you can run npm publish to publish the new version to NPM. npm install will install the latest version in ...
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Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?

What's the exact reason for using dispatch_once in the shared instance accessor of a singleton under ARC? 2 Answers ...
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JavaScript, get date of the next day [duplicate]

I have the following script which returns the next day: 3 Answers 3 ...
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jQuery disable a link

Anyone know how to disable a link in jquery WITHOUT using return false; ? 17 Answers ...
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Android : Check whether the phone is dual SIM

After a lot of research on forums, now I know that there is no way to find IMSI or SIM serial number for both the SIM cards in a dual SIM phone (except for contacting the manufacturer). Now my changed question is, can we at all detect that the phone has two SIMs? I believe it can be detected with so...
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How to redirect output of an entire shell script within the script itself?

... the output of a Bourne shell script to somewhere, but with shell commands inside the script itself? 5 Answers ...