how to use script sed with full path

azeus · 03-13-2008, 04:26 AM

I have a script like that

find `pwd` | sed -e "s\^.*root\/test/./"

I get an error if I use a parameter replace the path like that

my_path=root/test
find `pwd` | sed -e "s\^.*$my_path/./"

what should I do?

jschiwal · 03-13-2008, 04:38 AM

my_path=root\/test
find `pwd` | sed -e 's/^.*'"$my_path"'/./'

azeus · 03-13-2008, 10:39 PM

Quote:

Originally Posted by jschiwal

my_path=root\/test
find `pwd` | sed -e 's/^.*'"$my_path"'/./'

It does not work.
error occur

if I take out the single quotation mark like that, no error occur.
find `pwd` | sed -e 's/^.*"$my_path"/./'
however, the sed will not replace the pre-fix "root/test" to "."

What is the different between single quotation mark and double quotation mark in sed?

gilead · 03-13-2008, 10:54 PM

It's the shell, not sed, that is parsing the quotes. Double quotes allow variable interpolation, single quotes don't. There's a fair bit of info in the bash man page about it (I'm assuming your shell is bash).

You could also use a different separator for the substitute command in sed - then you shouldn't need to quote the variable. I'm not at a box I can test that on at the moment though.

ghostdog74 · 03-14-2008, 01:21 AM

Code:

find `pwd` | awk '{gsub("root/test",".") }1'

azeus · 03-14-2008, 01:29 AM

Quote:

Originally Posted by gilead

It's the shell, not sed, that is parsing the quotes. Double quotes allow variable interpolation, single quotes don't. There's a fair bit of info in the bash man page about it (I'm assuming your shell is bash).

You could also use a different separator for the substitute command in sed - then you shouldn't need to quote the variable. I'm not at a box I can test that on at the moment though.

thanks. yes, it is bash shell.
how do define another separator for the command in sed?

konsolebox · 03-14-2008, 01:42 AM

Hello gilead if it's ok i'll tell him for you. You can use the @ sign in sed if you like.

Code:

var="root/temp"
find `pwd` | sed -e "s@^.*${var}@.@"

chrism01 · 03-14-2008, 02:24 AM

Punctuation marks are popular. For an alternative, I go with colon ':', seems to stand out nicely when reading, esp if you are sed'ing dir paths.

azeus · 03-14-2008, 05:23 AM

Thank you everyone
The problem is solved.