Aix grep lines before and after match

UNIX AIX
1

I am trying to grep for 5 lines before and after a match. Since I am using AIX I do not have the GNU feature of :

grep -B 5 -A 5 pattern file

Is there a way to do this with grep, awk, perl, sed, something else? Can I please get a one liner? I am trying to do this across multiple servers.

2

@cokedude, any luck searching these forums for similar topics? It's been covered numerous times...

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6

An attempt with awk:

awk 'del=(a&&a--) {print; da=!a} $0~pattern{if (da) {print "--"; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=$0}' B=5 A=2 pattern=test filename

to emulate

grep -B5 -A2  test filename
7

Hi.

A few of the suggestions in Grep -C option not available - #4 by CarloM will allow a single command line to emulate GNU grep, but only after you install the alternate grep-work-alike codes, such as peg or cgrep.

Best wishes ... cheers, drl

8

This works when running a command on the current server. I have noticed when I try to run this on a remote server it does not work.

ssh server "awk 'del=(a&&a--) {print; da=! a} $0~pattern{if (da) {print "--"; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=$0}' B=5 A=2 pattern=Successful file"
bash: !a}: event not found

I tried to backslash it.

ssh server "awk 'del=(a&&a--) {print; da=\!a} $0~pattern{if (da) {print "--"; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=$0}' B=5 A=2 pattern=Successful file"

syntax error The source line is 1.
 The error context is
                del=(a&&a--) {print; >>>  da=\ <<< !a} bash~pattern{if (da) {print --; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=bash}
 awk: The statement cannot be correctly parsed.
 The source line is 1.

I tried set +H like this site suggested.

ssh server "set +H; awk 'del=(a&&a--) {print; da=! a} $0~pattern{if (da) {print "--"; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=$0}' B=5 A=2 pattern=Successful file"
ksh: +H: bad option(s)

Is there a way to get this to run on a remote server?

9

I have been unable to convince the senior admin to install this.

10

ssh host command args can give you a quoting headache, because there is the local ssh command where the local shell does a evaluation/dequoting, and then the remote command where the remote shell does another evaluation/dequoting.
Here comes a solution.
Save the command to a file, for example mygrep.sh in the current directory. Let the script pass the script arguments:

#!/bin/sh
awk 'del=(a&&a--) {print; da=!a} $0~pattern{if (da) {print "--"; da=0} a=A; if (B) {for(i=NR; i<B+NR; i++) if((i%B) in b) print b[i%B]} {print; da=1}} (B) {if (del) delete b[NR%B]; else b[NR%B]=$0}' "$@"

Then run the ssh as follows:

ssh host /bin/sh -s B=5 A=2 pattern=Successful file < mygrep.sh

The ssh remote shell runs another /bin/sh where -s tells to read commands from stdin and take the following arguments.
The stdin comes from the local mygrep.sh file.