7
ls lib/oracle-11.2.0.3.0.txt | sed 's/lib.\([oracle.*]\)\.txt/\1/'

It is giving the whole string instead of just oracle part until .txt What am I doing wrong?

I can do it using awk as follows, but, not sure why sed is not giving the wanted result.

echo "lib/oracle-11.2.0.3.0.txt" | awk -F/ '{print substr($2,1,index($0,".txt")-1);}'
12

[oracle.*] means "one of the characters o, r, a, c, l, e, ., or *". Consequently, your regex will only match something like

lib+c.txt

and not the actual filename you're passing it. If you remove the [ and ] from the regex, then it will work fine:

ls lib/oracle-11.2.0.3.0.txt | sed 's/lib.\(oracle.*\)\.txt/\1/'

However, a much simpler way of doing that is

basename lib/oracle-11.2.0.3.0.txt .txt

or, if you really want the file to come from stdin:

ls lib/oracle-11.2.0.3.0.txt | xargs -I{} basename {} .txt
5

Here are a few more ways of doing this:

  1. Perl

    echo "lib/oracle-11.2.0.3.0.txt" | perl -pe 's/.+(oracle.+)\.txt/$1/'
    
  2. sed

    echo "lib/oracle-11.2.0.3.0.txt" | sed 's/.*\(oracle.*\)\.txt/\1/'
    
  3. cut

    echo "lib/oracle-11.2.0.3.0.txt" | cut -d'/' -f 2 | cut -d '.' -f 1-5
    
  4. basename and bash

    echo "lib/oracle-11.2.0.3.0.txt" | while read n; do 
      echo $(basename ${n/.txt//}); 
    done
    
1

How about using cut

echo "lib/oracle-11.2.0.3.0.txt" | cut -c5-19

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