topic Re: sed issue? in Operating System - HP-UX

sed issue?

Jack_27 — Sat, 18 Jun 2005 02:53:36 GMT

Dear all,

Could you please tell me what's the meaning of:
grep -E '^exception:' $LOG | sed 's=[^.]*.$[0-9]*$.*=\1='

I can't find any clue of "s=..." in the manual of sed.

Thanks
Jack

Re: sed issue?

Ermin Borovac — Sat, 18 Jun 2005 03:16:43 GMT

s/regular expression/replacement/flags

Any character can be used instead of /.

In your case they used equal sign (=).

This sed command will match some text not containing dot character (.), followed by dot (.), followed by zero of more numbers, followed by zero of more characters. Numbers matched after the dot will be returned (\1).

hello world blah.123 hello world

and will return 123.

Re: sed issue?

Santosh Nair_1 — Sat, 18 Jun 2005 03:54:04 GMT

The '=' character is being used as a delimiter in sed, i.e. instead of the default '/' character.

As for the sed command, it looks like its looking for a number of non-dot characters, followed by a dot (.), followed by a number, followed by other characters. In its place it was put just the number, i.e. abcdef.12345ghijk will become 12345.

Hope this helps.

-Santosh

Re: sed issue?

Jack_27 — Sat, 18 Jun 2005 04:19:15 GMT

It's resolved.

Thank you both experts!
Jack