Convert numbers to SI notation

• convert from hexidecimal or octal to decimal

  Bash can accept '0x' and '0' notation for hexidecimal and octal numbers, so you just have to output the values. Show Sample Output

  This is sample output - yours may be different.

  510 27

  
  

  17
  echo $((0x1fe)) $((033))
  Mozai · 2011-12-06 02:00:42 1
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• Strip out Hungarian notation from a PHP file

  This removes the type prefix used in Hungarian notation (v. bad) for PHP variables. Eg. variables of the form $intDays, $fltPrice, $arrItems, $objLogger convert to $days, $price, $Items, $logger.

  This is sample output - yours may be different.

  
  

  0
  cat file.php | perl -p -e 's/(\$|->)(str|arr|obj|int|flt|boo|bool|mix|res)([A-Z])/$1\L$3/g'
  root · 2009-02-10 14:37:12 0
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• Use binary notation to chmod a file.

  I simply find binary notation more straightforward to use than octal in this case. Obviously it is overkill if you just 600 or 700 all of your files... Show Sample Output

  This is sample output - yours may be different.

  -rwxrwx-wx 1 nerd nerd 0 2011-11-16 23:29 foo
  

  
  

  0
  function right { bc <<< "obase=8;ibase=2;$1"; }; touch foo; chmod $(right 111111011) foo; ls -l foo
  nerd · 2011-11-16 22:43:31 0
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• Convert decimal numbers to binary

  Convert some decimal numbers to binary numbers. You could also build a general base-converter: function convBase { echo "ibase=$1; obase=$2; $3" | bc; } then you could write function decToBun { convBase 10 2 $1; } Show Sample Output

  This is sample output - yours may be different.

  $ for i in {0..10}; do decToBin $i; done
  0
  1
  10
  11
  100
  101
  110
  111
  1000
  1001
  1010
  

  
  

  3
  function decToBin { echo "ibase=10; obase=2; $1" | bc; }
  woxidu · 2009-11-24 22:57:58 0
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awk.exe?

RickDeckardt · 465 weeks and 2 days ago

More readable version (with biasing for m,u,n,..) -- { split(sprintf("%1.3e", $1), bits, "e"); if (bits[2] < 0) { bits[1] *= 1000; bits[2] -= 3; } prefix = substr("yzafpnum_kMGTPEZY", (bits[2]/3)+9, 1) output = sprintf("%f", bits[1] * (10 ^ (bits[2]%3))); gsub(/\./, prefix, output); print substr( gensub(/_[[:digit:]]*/, "", "g", output), 1, 4); } --

mungewell · 465 weeks and 2 days ago

yeah yeah cygwin you know... ;-)

mungewell · 465 weeks and 2 days ago

There has GOT to be a better way to do this

linuxrawkstar · 465 weeks and 2 days ago

I wish I could find a better way, spent about an hour googling. Better version: -- { split(sprintf("%-1.2e", $1), bits, "e"); prefix = substr("yzafpnum.kMGTPEZY", (bits[2]/3)+9, 1) output = sprintf("%f", bits[1] * (10 ^ ((bits[2]+18)%3))); gsub(/\./, prefix, output); print gensub(/\.$/, "", "g", gensub(/[0]*$/, "", "g", output)); } --

mungewell · 465 weeks and 2 days ago

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