help with lil' script

pe2338 · 10-07-2003, 09:17 AM

I know this is off topic, but I saw that the programming forum is kind of dead...

So my problem is: I want to repalce from a script the leading path /mnt/cdrom or something else given as an argument and to transform it into some other string...

the problem is with the /-es in the path...

they screw up the sed params....

I tried replacing static text weih the contents of a var and it works ...
the probl is with both vars....

Here is the script...
and is a GNU version 2.... if anybody wants it.

Code:

...... will be in the next post

ToniT · 10-07-2003, 09:45 AM

sed 's#a/source/path/#other/target/path#' < input.txt > output.txt
Or alternatively:
sed 's/a\/source\/path\//other\/target\/path/' < input.txt > output.txt

art15t · 10-07-2003, 09:52 AM

Yep thats it ToniT! Pe2338 needs to stop the shell from interpretting the "-" as an option to sed. This is most commonly done by preceding the meta-character with a \backslash-

ART

pe2338 · 10-07-2003, 10:25 AM

Here is the script ....

tried various ways... obvoious from the comments...

Code:


#!/bin/bash

LL=17			#Last line of comments 
LC=$(( $LL - 6))	#Length - no of lines of introductory comments
#echo LC este $LC

#This script is inteneded to make a tool for the users that have many CDs,
#that contain scattered info and files and ususally forget where are located.
#
#	Synopsis : cdsearch <--scan <cdname>|--rmcd|--rmpath|--rmfile> [--comment <comment>]
#
#  Options:
#	--scan		: adds a new dir to the colection
#	--rmcd		: removes a cd from the colection (not implemented)
#	--rmpath	: removes a dir from the colection (not implemented)
#	--rmfile	: removes a file from the colection (not implemented)
#
#
#this is the last line of intoructory comments and should NOT be included (LL+1=this line)

if test $# -le 1
then 
    cat $0 | head -n $LL | tail -n $LC | sed s/^\#//
elif test $# -ge 2
then
    
    while (($#>1));
    do
    case "$1" in
	    "--scan") 
		OPER=scan
		CDNAME=$2
		shift
		;;
	    "--rmcd"|"--rmpath"|"--rmfile") 
		OPER="not implemented" ;;
	    "--comment") 
		COMMENT=$2
		shift ;;
	esac
	shift;
#	echo $*		#Let's see all the params now
#	echo i is $i
    done
    
    # Now we know what to do...
    
    case "$OPER" in
	"not implemented")
	    echo operation not implemented
	    exit 1
	    ;;
	"scan")
	    echo "Will try to scan and add a new CD/dir to the collection"
	    
	    #Let's find out the name of the cd database file and some other info
	    if test -e "~/cdtool.conf";
	    then
		CDDRIVE=`cat ~/cdtool.conf | grep CDDRIVE | sed s/^\ *CDDRIVE\ *\=\ *//`
		COLLECTION=`cat ~/cdtool.conf | grep DATABASE | sed s/^\ *DATABASE\ *\=\ *//`;
	    else
		CDDRIVE=/mnt/cdrom
		COLLECTION=~/.cdtool/cddbase

		echo
		echo Drive : $CDDRIVE    Collection : $COLLECTION  CDName : $CDNAME
		echo
		

		if (test ! -d ~/.cdtool) ;
		then
		    mkdir ~/.cdtool;
		fi
		touch "$COLLECTION" ;
	    fi
	    
	    echo -n "Starting $CDDRIVE path scan..."
	    
	    echo	    
    
	    #TMP=`mktemp`
	    #rm -f "$TMP"
	    #TMP=`echo $TMP | cut -d'/' -f3-`
	    #echo "$TMP" 
	    #read
	    
#	    echo "\"$CDDRIVE\"" "\"$CDNAME\""

#	    echo "$CDDRIVE" | sed s/"\/"/'XXXX'/

	    CD=`echo "\\\"\"$CDDRIVE\\\"\"" ` #| sed s/"\/"/"\\\/"/ | sed s/"^"/"\""/`
#	    echo $CD
	    
#	    echo "/mnt/cdrom" | sed --file="./add" 
	    

#	    echo $CDDRIVE | sed s/$CD/"\\\"$CDNAME\\\" - "/ 
	    echo $CDDRIVE | sed s/"\/mnt\/cdrom"/"\\\"$CDNAME - \\\""/ 
#	    CN=`echo $CDNAME | tr "/" "\\\/" | tr ' ' "\\\ "`
#	    echo $CDNAME | tr "/" "\\\/" | tr ' ' "\\\ "
#	    CMD="sed s/\(\"$CD\"\)/\(\"$CN\"\)/"
	    
#	    echo $CMD $CD $CN
	    read	    
#	    find $CDDRIVE -true -noleaf | cut -d'/' -f$FF- | sed s/\("$CD"\)/\("$CN"\)/  # | cat >>$COLLECTION
#	    echo "done."
	    
	    ;;
    esac
    
fi

pe2338 · 10-07-2003, 10:28 AM

Quote:

Originally posted by ToniT
sed 's#a/source/path/#other/target/path#' < input.txt > output.txt
Or alternatively:
sed 's/a\/source\/path\//other\/target\/path/' < input.txt > output.txt

The quotes stop the text within them to be interpreted, but I need that...

As you can see the heading is in a var $CDDRIVE and the replace is in $CDNAME....

Thanks fo the help ...

ToniT · 10-07-2003, 12:41 PM

Ok,

I'm sorry, but there are so many tries that I don't follow what are you exactly trying to do and what is the problem with it.

Want to have a sed script that doesn't choke to slashes?

Use an other separator, like the # as used in my previous example or as
Code:
```
echo foo/bar/baz | sed s#foo/#ubl/e#
```

Want to have variables that are pre-substituted to the sed expression by shell?

Don't use single quotes or leave variables out of quotes.

Code:

export JEE='joo/jaa' ;  echo foo/bar/baz | sed "s#foo/#ubl/|$JEE|e#"
or
export JEE='joo/jaa' ;  echo foo/bar/baz | sed 's#foo/#ubl/|'"$JEE"'|e#'

Want something else, what?