Solved: Replace a line in a file with shell

[mister_v]

Hi,

I would like to replace (part of) a line in a file,
using a shell script

I know how to add a line, simply echo test >> file

But how do I replace a specific line, without touching anything else?


thanks

[chris]

You can use sed
It is a very useful program with lots of option (Check the man page > man sed)

Code: Select all

sed -i "s/12345678/${REPLACE}/g" $FILE

this replaces the string 12345678 with the contents of variable $REPLACE in the file $FILE.
the -i option let you edit the file

But if you want to replace a line, and you only know part the line.
Like you want to update a variable
You can use this code

Code: Select all

sed -i "s/\(variable=\).*/\1${NEWVALUE}/g" $FILE

\(variable=\).* searches for a line that starts with variable=
\1 tells to also write the first part (variable= in this case)
and the the new value $NEWVALUE

Hopes this is what you are searching for.

[mister_v]

Thanks that is exactly what I needed