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Full Discussion: Grepping before and after lines for required string
Operating Systems AIX Grepping before and after lines for required string Post 302744715 by Corona688 on Friday 14th of December 2012 03:18:56 PM
Old 12-14-2012
Slightly improved version:

Code:
cat <<"EOF" > context.awk
# Recall N lines ago up to 9 lines
function last(N)
{
        if(N>L) return("");
        return(LINE[(L-N)%CTX]);
}
 
{ LINE[(++L)%10]=$0 } # Remember line for later
 
$0 ~ PATTERN { for(N=CTX; N>=1; N--) print last(N);
        print;
        for(N=0; N<CTX; N++) { getline ; print }
}
EOF

Code:
$ gunzip < filename | awk -f context.awk CTX=3 PATTERN="myregex"

 

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LEARN ABOUT XFREE86

mkdir

MKDIR(1)							   User Commands							  MKDIR(1)

NAME

       mkdir - make directories

SYNOPSIS

       mkdir [OPTION]... DIRECTORY...

DESCRIPTION

       Create the DIRECTORY(ies), if they do not already exist.

       Mandatory arguments to long options are mandatory for short options too.

       -m, --mode=MODE
	      set file mode (as in chmod), not a=rwx - umask

       -p, --parents
	      no error if existing, make parent directories as needed

       -v, --verbose
	      print a message for each created directory

       -Z     set SELinux security context of each created directory to the default type

       --context[=CTX]
	      like -Z, or if CTX is specified then set the SELinux or SMACK security context to CTX

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report mkdir translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       mkdir(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/mkdir>
       or available locally via: info '(coreutils) mkdir invocation'

GNU coreutils 8.28						   January 2018 							  MKDIR(1)
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