extract regexp result from string and write it to a variable

Question

I\'m trying to write a shell script that searches in a file specified as argument $1 for a regex and writes the found subpattern into a variable I can then use.

let\'s s

Answer 1

dosth.sh:

#!/bin/bash
VALUE=`cat $1 | grep `
echo $VALUE

this can be used as:

$ ./dosth.sh a.txt

then the found strings are stored in the variable VALUE

You can also give the regexp over by some arguments (asked for the filename by the script):

dosth.sh:

#!/bin/bash
echo -e "Which file do you want to grep?"
read  FILENAME
args=("$@")
VALUE=`cat $FILENAME | grep $args`
echo $VALUE

which can be used like:

$ ./dosth.sh here comes my * pattern

Maybe this link is helpful for you: Link