Help with shell script.

[galger]

Need to change this script so it does not change date or permissions of file edited/copied.
and if possible- if file is being used by another process - do not touch and move on to next file.

Decription: change text within multiple files

:
# chtext - change text within multiple files

if [ $# -lt 3 ]
then
echo >&2 "usage: chtext old new [file ...]"
exit 1
fi

Old="$1"
New="$2"
shift; shift

for file
do
echo >&2 "chtext: change $file: $Old to $New"
if [ -r "$file" ]
then
if sed "s|$Old|$New|g" < "$file" > /tmp/ct$$
then
mv /tmp/ct$$ "$file"
else
echo >&2 "chtext: could not change file: $file"
fi
fi
done

 

[feherke]

Hi

If your [tt]sed[/tt] version support the -i option, then all is much simple. No need for [tt]if[/tt] and [tt]mv[/tt] and the file permissions will not change. ( Not a solution for keeping the file times too. )

for file
do
    echo >&2 "chtext: change $file: $Old to $New"
    [ -r "$file" ] && sed -i "s|$Old|$New|g" "$file"
    test $? -ne 0 && echo >&2 "chtext: could not change file: $file"
done

Otherwise just set the original permissions for the new file. See [tt]chmod[/tt], [tt]chown[/tt] and [tt]touch[/tt], they all have --reference= option.
To skip on files in use, just check them with [tt]lsof[/tt] or [tt]fuser[/tt], then step forward in the loop with [tt]continue[/tt], if necessary.

for file
do
    echo >&2 "chtext: change $file: $Old to $New"
    if fuser -s "$file"; then
      echo "$file in use by other process"
      continue
    end
    if [ -r "$file" ]
    then
    if sed "s|$Old|$New|g" < "$file" > /tmp/ct$$
    then
        chown --reference="$file" /tmp/ct$$
        chmod --reference="$file" /tmp/ct$$
        touch --reference="$file" /tmp/ct$$
        mv /tmp/ct$$ "$file"
    else
        echo >&2 "chtext: could not change file: $file"
    fi
    fi
done

Feherke.

http://rootshell.be/~feherke/