FW: [Gllug] Awk Sed

[Pete Ryland]

On Fri, Dec 07, 2001 at 07:39:52AM +0000, harry wrote:
> Hi all
> 
> Having had a little play I came up with the following to run through a
> directory and change text in only the files found.
> 
> Put this in a shell script called harrysed
> #! /bin/sh
> for file in $(ls  $3);do
> 
> echo $file
> sed -e 's/'$1'/'$2'/g' $file > '$fileff'; more '$fileff' > $file; rm
>  '$fileff'
> 
> done
> 
> Run like this
> 
> >$./harrysed a b *.txt
> 
> This will go through the current directory and substitute all the a's for b's
> only where the file has the .txt extension. Again it has not been tested much
> but it seems to work Ok. Any comments warmly welcomed.

some quick suggestions (if you must use sed :)

#!/bin/sh

if [ -z $3 ]; then
  echo "Usage: $0 a b files"
  exit
fi

pat1=$1
pat2=$2
shift 2

for file in $*; do
  if [ -d $file ]; then
    echo "$0: ignoring directory $file!"
    continue
  fi
  if [ ! -r $file ]; then
    echo "$0: $file is not readable!"
    continue
  fi
  sed -e "s/$pat1/$pat2/g" $file > ".harrytemp$file" && mv ".harrytemp$file" $file
  rm -f ".harrytemp$file"
done

Better yet, for more flexibility, make the user specify the whole sed
expression, similar to the rename(1) command.

Pete
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