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Old 12-30-2001, 11:33 AM   #1
Registered: Oct 2001
Distribution: MD81 RH71
Posts: 555

Rep: Reputation: 30
making my script generic

i'm trying to get a handy script to work nice and generically, and i'm stuck.

in the script, i want to use a sed command to change one parameter into another. I want to be able to write:

sed s/$1/$2/

but it doesn't work... i've tried every combinaion of quotes and such like, but not got anywhere. this sed command is in a variable assignment with back ticks, so using another backtick with echo stuff it up:

cd "$1"
for i in *
  if [ -d "$i" ]
    newdirpath=`echo "$PWD/$i" | sed s/$1/$2/ | tr ' ' '_' | tr A-Z a-z | sed s/_-_/-/`
    # echo $newdirpath
    # find if dir has subdirectories
    for j in "$PWD/$i"/*  
      if [ -d "$j" ]
        mkdir -p "$newdirpath"

    find "$PWD/$i" -iname '*.mp3' -fprint "$newdirpath".m3u 

    $0 "$i"     
cd -
so how do i make the first sed call generic???


oh right, ok, that does actually work after all. My problem is that i want to include /'s in the variable, which is what causes the problem. i need / as i want to pass the script two directories eg /smb/mp3 and /clone/mp3. how can i do this??

Last edited by bluecadet; 12-30-2001 at 12:39 PM.
Old 12-31-2001, 03:34 PM   #2
Registered: Aug 2001
Location: CT, USA
Distribution: Mandriva 2008
Posts: 105

Rep: Reputation: 15
I don't use sed much, but I believe there is a way to use a character other than "/" for the delimiter of the substitution command. You could try something simple like s<$1<$2<. If that doesn't work, you may have to explicitly define the "<" as your delimiter or "escape" it in some way....

Last edited by WindozBytes; 12-31-2001 at 03:37 PM.
Old 01-16-2002, 12:31 PM   #3
Registered: Jan 2002
Location: Melbourne, FL.
Distribution: redhat
Posts: 168

Rep: Reputation: 31
The previous post is the better solution I'd guess, but if you still need the escape character, use '\'

echo "/usr/local" | sed -e 's/\//-/g'

replaces all forward slashes with dashes.

$var = `echo $1 | sed -e 's/\//\\\//g'`

escape all slashes before passing $var to the quoted sed command


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