Shell Programming and Scripting

awk '{F=$1;a[F];e=(F~/sps$/)?" ":z;s=$2" "$3;p=$4;r=$5 
print "s/" s e p "/" s e r "/" >> F".sed"
}END{ 
for(i in a){print "sed -f "i".sed "i " >>"i".new">>"change2run"}
}' datatochange.txt

sh change2run

mv <file> <file>.old
mv <file>.new <file>
rm <file>.sed
rm change2run

mv <file> <file>.old
mv <file>.new <file> 
rm <file>.sed
rm change2run

mv "i" "i".old 
mv "i".new "i" 
rm -f "i".sed 
rm -f change2run

rm -f change2run
awk '{print $1}' datatochange.txt | uniq | awk '{print("mv "$1 " "$1"_old")}' | sh
awk '{print $1}' datatochange.txt | uniq | awk '{print("mv "$1".new" " "$1)}' | sh
awk '{print $1}' datatochange.txt | uniq | awk '{print("rm -f "$1".sed")}' | sh

#!/usr/bin/ksh

# Scan the file datatochange.txt AND generate the necessary files
# to perform the corresponding substitutions
awk '{F=$1;a[F];e=(F~/sps$/)?" ":z;s=$2" "$3;p=$4;r=$5 
print "s/" s e p "/" s e r "/" >> F".sed"
}END{ 
for(i in a){print "sed -f "i".sed "i " >>"i".new">>"change2run"}
}' datatochange.txt

# Run the substitutions and store the result in *.new file
ksh change2run

# Rename current file into *.old
# Rename the result *.new with the current file name (only if 
# the previous renaming was successful)
# Remove the *.sed files that were used during the substitution
awk '!a[$1]++{print $1}' datatochange.txt | while read i
do
mv "$i" "$i.old" && mv "$i.new" "$i"
rm "$i.sed"
done

# Remove the main script that were generated to process the substitution
rm change2run

awk '{a[$1]++; print $1}' datatochange.txt | `while read i` 
do 
mv "$i" "$i.old" && mv "$i.new" "$i"
rm "$i.sed" done

awk '{a[$1]++; print $1}' datatochange.txt | while read i  
do  
mv "$i" "$i.old" && mv "$i.new" "$i"
rm "$i.sed"
done

#!bin/csh

#!/bin/bash