[SOLVED] Bash help needed for creating lists

rng · 12-06-2015, 07:41 PM

I have a file (ori_file) with following contents:

Code:

a_name1
a_name2
a_name3

I have to create 2 files.

First file (outfile1) should have following contents ( "abc" first, then original word, then this word with first character removed):

Code:

abc a_name1  _name1
abc a_name2  _name2
abc a_name3  _name3

Followed by another file (outfile2) with:

Code:

def _name1
def _name2
def _name3

How can this be done with a bash script? Thanks for your help.

Keith Hedger · 12-06-2015, 07:53 PM

After more than 900 posts you should know how to post a question like this, and give what you have already tried etc, put some effort into it

rng · 12-06-2015, 09:44 PM

I can put additional words using awk but cannot remove first character of the word:

processor.sh :

Code:

#! /bin/bash -f
awk '
BEGIN 	{} 
{print "abc\t",$1}	
END   	{} 
'

then:

Code:

$ cat ori_file | ./processor.sh
abc 	 a_name1
abc 	 a_name2
abc 	 a_name3

berndbausch · 12-06-2015, 11:43 PM

I believe the awk function substr() would be a good approach. E.g. substr("a-name",2) yields "-name". For details, see the awk guide - the URL is in my signature.

The shell also has a way to generate a substring (I have the feeling that bash incorporates more and more awk-like text processing as time goes by). I don't know it by heart; check the variable substitution section in the bash reference manual http://www.gnu.org/software/bash/manual/bash.html.

rng · 12-07-2015, 02:32 AM

awk substr() function solved the issue. Thanks.