trjhtr

I am trying to remove the error messages printed into my file.
I have this:

 addr:1122c:1234:
 addr:11230:5678:
 addr:11223:01Error:abcdef(x, y) = z, value = a
Error:hijklm(v, q) = w, value = b
Error:nopqrst(x, y) = z, value = d
Error:uvwxyz(l, m) = z, value = e
Error:1234(u, t) = z, value = f
Error:567(r, s) = z, value = g
err_total = 9846, err_sub = 0, err_mask = 239
1 Duration: xyz, abc
0 Duration: pqr, def
23:
 addr:11238:4567:
 addr:1123c:8901:

I need to remove all the error messages upto the next addr appears.
Required output is:

 addr:1122c:1234:
 addr:11230:5678:
 addr:11223:0123:
 addr:11238:4567:
 addr:1123c:8901:

I have tried:

sed -i "/bErrorb/d" file_name

But this removes the lines starting from Error and did not remove the line where Error string started from the middle.

I am new to regular expressions, an explaination would be really helpful.

Edit:
I am using sed -i '/Error/,/addr/d' filename
but this removes the whole line and does not give what I am looking for.

sed is not really good in Multiline Matching.

You can trick it to do what you want, but then imo perl is easier to handle.

Try this:

perl -pe 'BEGINundef $/;; s/Error.*?(^[0-9]* Duration: [^n]*n)+//smg;'

Explanation:

• 
  BEGIN do_something; : Do something once at the beginning


• 
  undef $/: Ignore line endings


• 
  s/// Substitute


• 
  Error.* Match any string beginning with "Error".


• 
  ? Make the previous match ungreedy, for that it stops at the following match or in this case matching group...


• 
  ()+ Make a matching group, that needs to be matched at least once (+).


• 
  ^[0-9]* Duration: [^n]*n: Match the whole line with Duration including.

(via)

Rather than deleting the "Error:" lines, why not extract just the lines you want with:

grep -E '^ addr:' file_name | sed -e 's/Error:.*//'

This will generate the output you have been looking for:

$ cat file_name | grep -v 
 -e '^Error:' 
 -e '^err_total' 
 -e '^.*[0-9] Duration:' | 
 sed ':a;$!N;s/Error:.*n(.*[0-9]):/1:/;ta;P;D'

Frist remove all the Error, err_total, and 12345 Duration: stuff. Then search for the Error: ... interrupting your output, remove the newline(n), search for the next occurence of a number (.*[0-9]:) an append it to the current line.