If using variables you will need to use double quotes instead of single.

yes but the problem is the same. in the variable there are / cause is a web link
and i have back only error. i don't know what's wrong cause i'm new about sed and
script in general.
pls help.
thanks

Please show what you are assigning to the variable?

i have to insert
http://update.mysite.com/softw/12release/update/ at the starts of each line before the filename
(e.g. http://update.mysite.com/softw/12rel...3r8rheuwir.cfg)
i use this script
sed 's/^/http:\/\/update.mysite.com\/\softw*12release*update*/' list.txt
where list.txt contains a list of files like this:

........
x4er4lsc_920d904bz.cfg
x4er4lsc_920d905bz.cfg
x4er4lsc_920d906bz.cfg
x4er4lsc_920d907bz.cfg
x4er4lsc_920d908bz.cfg
x4er4lsc_920d909bz.cfg
x4er4lsc_920d910bz.cfg
x4er4lsc_920d911bz.cfg
x4er4lsc_920d912bz.cfg
x4er4lsc_920d913bz.cfg
........

no problems until the slash is followed by "number" or "u" or "a".
how can i resolve?
temporally i change the slash substitution between each fields with asterisk "*"
e.g http://update.mysite.com/softw*12rel...4c_920d9bz.cfg
and then manually by kate editor replace "*" with "/".
i resolve temporally but i desire that this action will be automatic.
what's wrong?

i try

URL='http://update.mysite.com/softw/12release/update/'

sed "s/^/$ADRS/g" infoavi.txt

return the error

sed: -e expression #1, char 11: unknown option to `s'

how can i pass variable to sed?

Ahhh ... but of course if you are saying "/" is the separator then as soon as it hits the next one it will stop, however, sed allows for this, so try:
This of course assumes that the symbol @ is not in the variable either

1 members found this post helpful.

B I N G O ! ! ! ! ! ! !

i try many times and search on the web, piece by piece and test by test i found what that i want.

URL="http:\/\/update.mysite.com\/\softw\/12release\/update\/"

sed "s/^/$URL/g" list.txt

results ok

........
http://update.mysite.com/softw/12rel..._920d918bz.cfg
........

only one question. if you look at the web url, the word "update", if change in with other word like "group" i need to add a backslash before letter "g".
what's the difference?
i see that's difference also if i use numbers. why?
thank you for cooperation.

tastiero, please use [code][/code] tags around your code and data, to preserve formatting and to improve readability. Please do not use quote tags, colors, or other fancy formatting.


Don't bother trying to backslash-escape the contents of the variable itself. Trying to do such generally only leads to frustration.

As grail mentioned, you don't have to use "/" as the sed "s" command delimiter; just about any ascii character can be substituted instead. Simply choose one that isn't found in the string itself.

grail used "@" above, but I personally like to use "|" myself most of the time.


Edit: BTW, since "^" can only match once per line, the "g" (global) modifier isn't necessary here. You only need to use it when doing multiple replacements on a single line.

1 members found this post helpful.

thanks david and grail
i try as soon as possible and let you know

Thanks david, it works fine like i want.
i hope to exchange problems and solution again.
thanks to all that help me.

Please remember to mark as SOLVED once you have a solution

Good to hear it. Please mark the thread as solved.

(D'oh. Beaten by grail. )