Grep to ignore suffix & find end of line


 
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Operating Systems SCO Grep to ignore suffix & find end of line
# 1  
Old 12-22-2015
Grep to ignore suffix & find end of line

In COBOL, a hyphen can be used in a field name and in a specific program some field names would be identical to others except a suffix was added--sometimes a suffix to a suffix was used. For example, assume I am looking for AAA, AAA-BBB, and AAA-BBB-CCC and don't want to look at AAA-BBB-CCC results mixed in with just AAA. My try is to ignore the field if it ends with a final hyphen so I wouldn't see "AAA-".

I have tried
Code:
grep 'AAA[^-]' progname
grep 'AAA-BBB[^-]' progname
grep 'AAA-BBB-CCC[^-]' progname

in a script.
The problem was that grep could not find a field if it was on the end of a line.
Code:
          ADD XYZ TO AAA-BBB

Is there any way to fix this?
TIA
# 2  
Old 12-22-2015
I guess - as it is not too clear - that you want the second grepto match your file. Try the alternation (using | ) in a subexpression:
Code:
grep -E 'AAA-BBB([^-]|$)' file

(you may have to switch on "extended regexes")
This User Gave Thanks to RudiC For This Post:
# 3  
Old 12-22-2015
Using a $ anchor you can address all trailing characters
Code:
grep 'AAA[^-]*$' file

This User Gave Thanks to MadeInGermany For This Post:
# 4  
Old 12-22-2015
Quote:
Originally Posted by MadeInGermany
Using a $ anchor you can address all trailing characters
Many thanks, that did the trick!

---------- Post updated at 01:54 PM ---------- Previous update was at 01:22 PM ----------

On second thought, almost. If there is a hyphen anywhere later on the line, the line is thrown out. The first line of this code is OK, the second isn't, and the third is ok.
Code:
    03  AAA    PIC 999V99.
             MULTIPLY AAA BY 100 GIVING OUT-AMT.
            ADD XYZ TO AAA

RudiC: Your suggestion works, many thanks!
# 5  
Old 12-23-2015
But does it fail on
Code:
ADD AAA TO AAA-BBB

A more reliable way is to create a cross reference listing in a compile.
# 6  
Old 12-23-2015
Would this do?
Code:
grep -E 'AAA(-BBB(-CCC)?)?([^-]|$)' file

# 7  
Old 12-23-2015
Every field in a work area was supposed to be added to when certain filters were true and, in a control break, non zero values of those fields would trigger further processing. I had started by copying that work area to a new file, removing everything but the data names, then building identical grep commands around it. The suggestion RudiC made helped me check out and document that program as well as giving me a useful tool for the future.

I've used other compilers that produce sorted cross references of all data names but the compiler I use now doesn't do that.
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