I'm trying to edit a text file programmatically, which contains a line like this:
db.username="tata"
db.password="toto"
which I want to look like this:
db.username="fofo"
db.password="bar"
Here is the regex :
^\s*db.username="([^"]*)
when i try to use this command
sed -i -E '^\s*db.username="([^"]*)' 'fofo' file.txt
I'm getting the error:
sed: -e expression #1, char 1: unknown command: `^'
you are mixing grep's regex and sed's substitution.
use either
sed -e '/db\.username/s/"[^"]*"/"foo"/' txt
db.username="foo"
db.password="toto"
where
/db\.username/ tell sed to operate on line whith db.username (. is special caracter in sed)s replace"[^"]*" a quote, any number of non quote, a quote by"foo"/db.username/ would match db_username, dbXusername ....or
sed -e 's/db\.username="[^"]*"/db.username="foo"/' txt
db.username="foo"
db.password="toto"
on a further note, sed can capture pattern
sed -e 's/db\.username="\([^"]*\)"/usename is \1/' txt
usename is tata
db.password="toto"
\( \) capture text\1 use first captured textgrep can too
grep -Eo '"[^"]*"' txt
"tata"
"toto"
sedcommand is incorrect. The syntax for replacements issed 's/regex/replacement text/' file. Also, please indicate how the solution you look for is to decide which line to act upon. Do you want to replace every occurence oftatawithfofo/totowithbar, or just set the value ofdb.usernametofofoand that ofdb.passwordtobar? Your examples implies the latter, but please specify it explicitly in your question.