Unable to replace path using sed

sed

How can i replace a path with another path in file using sed command, And when it is used as a variable in script it is working.

sed -i "s/"system_filter = /etc/define_filter_file"/"system_filter = /usr/local/etc/file_regex"/g" /etc/exi.conf.bak

You need to escape all slahes in the provided paths and change opening and terminating quotes to single quotes.

sed -i 's/"system_filter = \/etc\/define_filter_file"/"system_filter = \/usr\/local\/etc\/file_regex"/g' /etc/exi.conf.bak

The command is expressed as:

sed -i 's/path1/path2/g'

Path1 and path2 can not clearly contains / as this will be confused with the whole expression.

Do not run the command you are trying to run

If you try to redirect output from sed back into the same file it will blank it out, deleting all of the files contents. Try something like this:

sed s/world/cat/ <test.properties >newtest.properties && sudo mv newtest.properties test.properties

You get permission denied because the redirection part of the command is not run via sudo, but run as your normal user.

The first command works because you are simply reading the first file and writing to a file you own, so you regular user could do that.

echo "A=[A]" | sed s'/[]=]/ /g'

A [A