Tokenize a unicode text file and find word frequency

CHARS=$(python -c 'print (u"\u0621\u0622\u0623\u0624\u0625\u0626\u0627\u0628\u0629\u062A\u062B\u062C\u062D\u062E\u062F\u0630\u0631\u0632\u0633\u0634\u0635\u0636\u0637\u0638\u0639\u063A\u063B\u063C\u063D\u063E\u063F\u0640\u0641\u0642\u0643\u0644\u0645\u0646\u0647\u0648\u0649\u064A".encode("utf8"))')

Dump tcp traffic in Linux

A very common task while troublshooting software servers installed on Linux, is to check if they are receiving traffic at all! Many times the problem is the firewall is just blocking the incoming traffic. Not finding this quickly and lead to hours fiddling with configuration files and all sorts of complex things.