#

#!/bin/ksh

# Version 1.1 Added -n option to select which instance of target is changed, 10/23/01 jsmith

# Version 1.2 Added -k option to specify a keyword from which to start changes, 10/24/01 jsmith

function PrintUsage

{

echo ""

echo "USAGE: changeSTRING [options] <target_string> <new_string> [file_name [filename2 ...]]"

echo " changeSTRING [options] <target_string> <new_string> [directory_name] "

echo " changeSTRING [options] <target_string> <new_string> "

echo

echo "Replaces all instances of target_string with new_string in the "

echo "specified file(s)."

echo

echo "You can enter 1 or multiple specific file names, with or without a "

echo "qualified path. If no path is given, the current directory is "

echo "assumed. File names should be separated by blanks."

echo

echo "If you specify a directory name, then ALL files, containing "

echo "target_string, in that directory will me changed."

echo

echo "If you don't specify either a file_name OR a directory name then ALL "

echo "files in the CURRENT directory will be searched."

echo

echo "OPTIONS: All options MUST be specified before any other parameters."

echo

echo " \"-f\" will cause all specified files to be change regardless of their"

echo " write protection. Files will be left as write ENABLED. \"-f\" MUST be the "

echo " FIRST parameter."

echo

echo " \"-n number\" will cause only the number'th instance of the target string to be changed on"

echo " each line in the specified file where Targe appears."

echo " If there are two instances of target on a line, changeSTRING will, by default, change both."

echo " Ifyou were to include \"-n 2\" on the command line, only the 2nd instance would be changed."

echo

echo " NOTE: if there are not \"number\" occurences of target on a line, then NO"

echo " changes will be made on that line. It is \"number\" or nothing."

echo

echo " NOTE: The \"-n\" option modifes the default behavour for a single line in the specified file."

echo " changeSTRING will still change Target for every line in the file. If you want to modify"

echo " which lines in the file changeSTRING operates on, you have to use the \"-k\" option."

echo

echo " The first instance \"-k Keyword\" will cause changeSTRING to search the file for Keyword "

echo " and then start making string substuitions. Instances of target BEFORE Keyword will not be "

echo " changed. If Keyword contains blanks, it must be placed in double quotes (\")."

echo

echo " \"-k Keyword\" can be entered as an option a 2nd time with a different (or the same) "

echo " Keyword value. This will cause changeSTRING to isolate the text between the two Keywords"

echo " and make the changes there. Instances of Target before KeyWord1 and after KeyWord2 would"

echo " not be changed."

echo

echo " \"-1\" can be used to limit the change to a single line, instead of the whole file. Only the first"

echo " line where Target occurs will be changed."

echo

echo "NOTE: changeSTRING does not change files in sub-directories. These "

echo " must be changed with another changeSTRING command."

echo

echo "NOTE: !!!! changeSTRING does NOT MAKE BACKUPS !!!!"

echo

echo "NOTE: ALL the options may be used together."

echo

exit 1

}

if [[ $2 = "" || $1 = "-h" ]]; then PrintUsage; fi

Force="-p"

changeparm="g"

KeyWord1=""

KeyWord2=""

changecount=0

while (( 1 == 1)); do

case $1 in

-f) Force="-fp"

shift

;;

-n) changeparm="$2"

shift

;;

-k) if [[ $KeyWord1 = "" ]]; then KeyWord1="$2"; else KeyWord2="$2"; fi

shift

;;

-1) changecount=1

shift

;;

*) break

;;

esac

done

oldstr="$1"; shift

newstr="$1"; shift

if [[ $1 = "" ]]; then

file_list=`ls -d ./*`

elif [ -d $1 ]; then

file_list=`ls -d $1/*`

else

file_list="$@"

if [[ "$oldstr" = "$newstr" ]]; then

echo "STRINGS ARE THE SAME -- no change possible -- Exiting"

exit 0

let file_count=0

Error=0

for file in `grep -l "$oldstr" $file_list`; do

Error=0

if [ ! -a $file ]; then

echo "$file does not exist!"

elif (( `grep -c "$oldstr" $file` == 0 )); then

echo "Target String Not Found in $file"

else

cp -f $file $file.SaVe

if [[ $KeyWord1 != "" && `grep "$KeyWord1" $file` != "" ]]; then

let j1=`grep -n "$KeyWord1" $file | head -1 | cut -d":" -f1`

let j2=$j1+1

head -$j1 $file > $file.tmp

tail +$j2 $file > $file.tmp.2

mv -f $file.tmp.2 $file

elif [[ $KeyWord1 != "" ]]; then

echo "!!! $KeyWord1 not found !!!"

Error=1

if [[ $KeyWord2 != "" && `grep "$KeyWord2" $file` != "" ]]; then

let j2=`grep -n "$KeyWord2" $file | head -1 | cut -d":" -f1`

let j1=$j2-1

head -$j1 $file > $file.tmp.2

tail +$j2 $file > $file.tmp.trailer

mv -f $file.tmp.2 $file

elif [[ $KeyWord2 != "" ]]; then

echo "!!! $KeyWord2 not found !!!"

Error=2

if [[ $changecount != "0" ]]; then

let j1=`grep -n "$oldstr" $file | head -1 | cut -d":" -f1`

let j2=$j1+1

tail +$j2 $file > $file.tmp.trailer.2

cat $file.tmp.trailer >> $file.tmp.trailer.2 2>/dev/null

mv -f $file.tmp.trailer.2 $file.tmp.trailer

head -$j1 $file | tail -1 > $file.tmp.2

let j1=$j1-1

head -$j1 $file >> $file.tmp

mv -f $file.tmp.2 $file

if [[ $Error = "0" ]]; then

cat $file | sed -e "s+$oldstr+$newstr+$changeparm" >> $file.tmp;

if [[ $? != "0" ]]; then

echo "!!! cat/sed command did not work !!!"

Error=3

else

cp $Force $file.tmp $file

if [[ $? != "0" ]]; then

echo "!!! cp command did not work !!!"

Error=4

else

if [[ -s $file.tmp.trailer ]]; then

cat $file.tmp.trailer >> $file

rm $file.tmp.trailer

if [[ $Error = "0" ]]; then

echo $file changed

let file_count=file_count+1

rm -f $file.SaVe

else

echo "Error Encountered ... $file NOT changed !!!"

chmod +w $file.SaVe

mv -f $file.SaVe $file

rm $file.tmp* 2>/dev/null

done

if (( file_count == 0 && Error == 0 )); then

echo "Target string NOT found in file list"

elif (( file_count == 0 )); then

echo "NO files changed\n"

elif (( file_count == 1 )); then

echo "1 file changed\n"

else

echo "$file_count files changed\n"

exit $Error