Technology DB

Here are some cool python one liners.

• Parse apache log using python: print 5th field
  python -c “import csv,sys;f=csv.reader(sys.stdin, delimiter=’ ‘); print ‘\n’.join([r[5] for r in f])
• Generate frequency histogram from a text files of terms
  cat file.txt | sort | uniq -c | sort -rn
• print 2nd column of a tab separated file
  awk -F”\t” ‘{print $2}’
• perl search replace from files
  perl -i -p -e ’s/old/new/g’