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Question: TOPIC: Shell Scripts I am working on a 3 part prob...

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TOPIC: Shell Scripts

I am working on a 3 part problem and I have successfully completed the first 2 parts but can't figure out the third.

Part 3:

Generalize your subst2 script, producing a new script subst that will apply a substitution to any number of files given on the command line. For example

should apply the same substitution throughout each of the three files named there (replaces all occurences of the word "foo" with "bar" in the given files)

MY subst2 script:

#!/bin/sh

echo $1
echo $2
echo $3

if grep "$1" "$3" > /dev/null; then
mv "$3" "$3.bak"
sed "s/$1/$2/g" "$3.bak" > "$3"
fi

essentially, I need to modify the above subst2 script so that it can handle any number of files that are entered on the command line

Explanation / Answer

#!/bin/sh i=1 first=$1; second=$2; for file do $((i++)) if [ $i -ge 3 ]; then sed -i 's/'$first'/'$second'/g' $file" fi done

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