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How does the String class override the + operator?

... is convertible (§5.1.8)to a primitive numeric type, or a compile-time error occurs. In every case, the type of each of the operands of the binary - operator must be a type that is convertible (§5.1.8) to a primitive numeric type, or a compile-time error occurs. ...
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What's a concise way to check that environment variables are set in a Unix shell script?

...xpansion. For example, the bash manual says: ${parameter:?word} Display Error if Null or Unset. If parameter is null or unset, the expansion of word (or a message to that effect if word is not present) is written to the standard error and the shell, if it is not interactive, exits. Otherwise, t...
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Programmatically stop execution of python script? [duplicate]

... sys.exit() will do exactly what you want. import sys sys.exit("Error message") share | improve this answer | follow | ...
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What is better, curl or wget? [closed]

... to automate downloading stuff. However, with CURL, I frequently encounter error 18 - transfer closed with outstanding read data remaining (see stackoverflow.com/questions/1759956/…). This error I mostly get while trying to use it in Perl scripts, but WGET never gives me such issues. Shouldn't thi...
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Invalid syntax when using “print”? [duplicate]

... # You must call the function! Old: print >>sys.stderr, "fatal error" New: print("fatal error", file=sys.stderr) Old: print (x, y) # prints repr((x, y)) New: print((x, y)) # Not the same as print(x, y)! ...
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update columns values with column of another table based on condition [duplicate]

... It gives me error message: invalid object table1. – niceApp Nov 17 '09 at 3:17 2 ...
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How to remove MySQL root password [closed]

...e I have set the password of root user. That's why phpmyadmin is giving an error: 2 Answers ...
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PHP mailer multiple address [duplicate]

... BEWARE: using AddCC() in place of AddAddress() caused the PHPMailer error Email error: You must provide at least one recipient email address. PHPMailer seems to have recovered from this by copying the first CC address into the To field. This ended up with emails that are both emailed and cc'...
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HttpServletRequest get JSON POST data [duplicate]

...e()) != null) jb.append(line); } catch (Exception e) { /*report an error*/ } try { JSONObject jsonObject = HTTP.toJSONObject(jb.toString()); } catch (JSONException e) { // crash and burn throw new IOException("Error parsing JSON request string"); } // Work with the dat...
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SVN- How to commit multiple files in a single shot

...ngelist, it shows "skipped". When u commit with the changelist, svn showed error E200009: '[folder you added]' is not known to exist in the repository and is not part of the commit, yet its child '[file you added]'' is part of the commit. – Andy Wang yesterday ...