Sed 1

[dduuhh]

Hi all

I am having difficulty using the sed command.
I want to replace backward slashes in a file with forward slashes.

I can replace "\a" with "/a" using sed 's/\\a/\/a/g' ${ORIG_FILE}.01 > ${ORIG_FILE}.02

However if I use the for loop command below it doesn't work:

for LETTER in a b c d e f g
do
sed "s/\\${LETTER}/\/${LETTER}/g" ${ORIG_FILE}.01 > ${ORIG_FILE}.02
mv ${ORIG_FILE}.02 ${ORIG_FILE}.01
done

Cheers and thanks
Dduuhh

 

[Annihilannic]

How about:

[tt]for LETTER in a b c d e f g
do
sed '/\\'${LETTER}'/\/'${LETTER}'/g' ${ORIG_FILE}.01 > ${ORIG_FILE}.02
mv ${ORIG_FILE}.02 ${ORIG_FILE}.01
done[/tt]

There's no reason why you can't temporarily close the ' quotes and re-open them after each shell variable that you want replaced with a letter (provided the variable doesn't contain spaces, etc.).

Annihilannic.

 

[tarn]

Ok after spending 3 hrs "and the rest" trying to resolve this (for myself satisfaction), I have this:

test file is called ted.txt and contains:
\a \b \c \d \e \q \r \i
\a \b \c \d \e \q \r \i
\a \b \c \d \e \q \r \i
\a \b \c \d \e \q \r \i

Now I want to change the slashes around for a b c +d ...

so I do:
sed 's#\\\([a,b,c,d]\)#\/\1#g' ted.txt

And I get:
/a /b /c /d \e \q \r \i
/a /b /c /d \e \q \r \i
/a /b /c /d \e \q \r \i
/a /b /c /d \e \q \r \i

Ta Dar!

Ok to explain:
No need for for LETTER in .... just give the list in sed inside the SQUARE brackets comma seperated [a,b,c,d], the round brackets are escaped with a \( \) and this records the value of the letter found "not the leading slash though", still with me ? this "recorded" value is placed back in to the replace string with the "\1" and an escaped "\/" is subistuted .. I think ... bugger that got me confused !:¬)

Oh and I used # marks as delimitters for sed to save escaping another set of \'s

Try it ...
Good Luck.
Laurie.