Shell Programming and Scripting

Hi.
My experience is different from that.

According to http://en.wikipedia.org/wiki/Usage_s...rating_systems , the non-MS-Windows Desktop OSs are (in order) OS-X, Linux, and other.

I have found either a GNU-grep or a GNU work-alike on:

Code:

OS-X
BSD {free,new,open}
Solaris
OpenIndiania

I will admit that I don't recall if I installed the GNU code in Solaris and OI, but it must not have been much work if I did. The codes are in very differently-named directories, often not in default path settings, so I would not be surprised that many people do not know about them (and their associated man pages).

Virtually all supercomputers use Linux (ibid.). When I worked in one of the supercomputer centers, the initial Cray-2 used a variant of AT&T Unix, but these days most have shifted over to a form -- often custom -- of Linux. Similar for the ETA10. The TMC TM-5 used Unix in all the nodes as I recall. The 3090s used Unix in VMs (too long ago, but possibly AIX).

Of the "other", I looked at AIX and HP-UX. The AIX7 to which I had access offered GNU grep. I could not find it on HP B.11.11.

The mainframe OSs are usually whatever IBM has for the OS/390 follow-ons, z/OS, but also Linux and openSolaris.

CPAN has a number of grep work-alikes (written in perl, available for copying into one's own home-bin, not needed to install in the system), for example:
http://www.cpan.org/authors/id/A/AD/ADAVIES/peg-3.10 which has the context-printing capability (-B, as well as -A and -C). This code, peg, was quickly made to work on HP-UX, and:

Code:

peg -B1 string file

worked as one would expect from GNU grep.

Best wishes ... cheers, drl

( Edit 1: minor typo )

try this:

Code:

awk -F"mdn" "{a[NR]=$0}/WARNING/{$0=a[NR-4];print substr($2,2,9)}" file | sort | uniq

*shrug* I don't know what to tell you then, since a very frequent use of awk is reinventing -B for all the posters here which don't happen to have it. Perhaps we don't get an "average" distribution of people, or perhaps "average" is a bad metric to use (how many people here manage *super*computers?) etc.

Hi.
See thread https://www.unix.com/showthread.php?p...#post302876589 for a contiuation of this sub-topic ... cheers,drl

The ex utility fits the bill in case you'd consider it...

Code:

ex -sc "/SendProv has thrown exception/-4 | q!" your_log_file

Only caveat here is that the desired line has to be exactly 4 lines before the supplied regexp...