Shell Programming and Scripting

	  grep -rl 'Sept_2012' ./ | xargs sed -i 's/Sept_2012/Oct_2012/g'
	  
	  sed '/Sept_2012/ {n; s/Sept_2012/Oct_2012/;}'

	  awk '/Sept_2012/{x++}x{sub("Sept_2012","Oct_2012")&&x++&&x=(x==2)?0:x}1' infile
	  
	  cat sample.txt | sed -e "s/$SEARCH/$REPLACE/" >> result.txt
	  
	  perl -p -i -e 's/original text string/replacementstring/g' file

#!/bin/sh
for fl in *.py ; do
mv $fl $fl.old
sed 's/Sept_2012/Oct_2012/g' $fl.old > $fl
rm -f $fl.old
done

find . -name "*.py" -exec grep "Oct_2012" {} \;

#!/bin/sh
for fl in *.py ; do
mv $fl $fl.old
sed 's/Sept_2012/Oct_2012/g' $fl.old > $fl
rm -f $fl.old
done

find . -type f -name ".*py" -exec sed -i 's/sep_2012/Oct_2012/g' {} \;

find . -type f -name ".*py" -exec sed -i 's/sep_2012/Oct_2012/g' {} \;

"*.py"

find . -type f -name "*.py" -exec sed -i 's/Sept_2012/Oct_2012/g' {} \;