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1 0:4182672fd6f8 Chris 
#!/bin/bash
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filelist="$1"
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common_st="`head -n 1 "$filelist"`"first
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while read f; do


      

      

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	diff_pos=`./diff_position.sh "$common_st" "$f"`


      

      

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	last_same=$(( $diff_pos-1 ))


      

      

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	common_st="`echo "$common_st" | cut -c 1-$last_same`"


      

      

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done < "$filelist"


      

      

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echo "$common_st"