Let's say I have a file.txt file like this:
some words
from here
blah blah blah
that begins
this is this
to here
other content
and another file called *config.conf" like this:
name1:value1
name2:value2
expr:sed -re "s/this/that/g" -ne "/from here/,/to here/ p"
name3:value3
name4:value4
In my script.sh I need to get the whole sed command that is written after "expr:" in the config.conf and execute it in a pipe like this :
#!/bin/bash
pipecommand=$(cat info | grep -e "^expr:" | sed -re "s/^expr://g")
cat file.txt | $pipecommand > output.file
but I get this error:
sed: -e expression #1, char 1: unknown command: `"'
I've read about many similar questions here and the solution was using an array like this:
pipecommand=($(cat info | grep -e "^expr:" | sed -re "s/^expr://g"))
cat file.txt | ${pipecommand[@]} > output.file
Unfortunately this works only with less complex commands and only if I assign the "sed...blah blah blah" command directly to the variable, without reading it from a file.
Do some of you know a working solution to this?
P.S.: I can change both the script.sh and the config.conf files.
Turn your config file into a plugin with a well-defined interface. Here, your script expects a function named sed_wrapper, so you provide a definition with that name in your "config file" (renamed to lib.sh here).
# This is lib.sh
sed_wrapper () {
sed -re "s/this/that/g" -ne "/from here/,/to here/ p"
}
Then, in your script, call the named function.
. lib.sh
sed_wrapper < file.txt > output.file