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Reverse a string

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October 9th, 2006 toydi Posted in python, rev | Hits: 4848 |

python provides a -c option to accept and run a script line.

To reverse a string like this one: “toydi deified idiot”.

echo 'toydi deified idiot' | python -c "print raw_input()[::-1]”
  1. echo prints the string to stdout.
  2. python run the script line.
  3. raw_input() read from stdin (to read from pipe and return the string).
  4. [::-1] simply says: steps through and return each character in the string, but in reverse order (-1).
  5. print prints the reversed string to stdout:
toidi deified idyot

Have fun with python!
Wait.. ok, actually, rev will just do the job:

echo  "toidi deified idyot" | rev
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3 Responses to “Reverse a string”

  1. aizatto Says:
    October 9th, 2006 at 5:24 pm

    I thought this was Linux by Examples, not Python :P.

    So I’m going to add some ruby mix to the fun.

    echo "ruby r  roxors" | ruby -e '$stdin.each { |line| puts line.reverse }'

    You’ll get an extra line at the top because it also reversed the new line character.

  2. bm Says:
    October 12th, 2007 at 6:29 pm

    echo -ne “string” does not generate newline

  3. Rajesh Duggal Says:
    June 10th, 2008 at 1:44 pm

    echo “ruby r roxors” | ruby -lne ‘puts $_.reverse’

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