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Full Discussion: Shell script to filter certain lines from a file
Top Forums UNIX for Beginners Questions & Answers Shell script to filter certain lines from a file Post 303035806 by Don Cragun on Monday 3rd of June 2019 07:37:57 PM
Old 06-03-2019
Note that if you keep coming to us with requests for us to write code for you with you not attempting to write any code on your own, we're likely to lose interest in helping you. We are here to help you learn how to do this stuff on your own; not to act as your unpaid programming staff.

I would be tempted to try something like:
Code:
#!/bin/ksh
awk '
/^create / {
	c = $0
}

/^from .*@/ {
	print c
	print
}' "$@"

Store the above in a file named whatever you want your utility to be named and make it executable in a directory in your search path (i.e. one of the directories named in the environment variable PATH).

If you name your utility scriptname, you can then invoke it any of the following forms:
Code:
cat pathname... | scriptname
scriptname pathname...
scriptname < pathname

where pathname... can be replaced with the pathname(s) of one or more files you want to process. (Note that there is no ... in the last form (and only one pathname can be processed using that form).
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LEARN ABOUT FREEBSD

manpath

MANPATH(1)						    BSD General Commands Manual 						MANPATH(1)

NAME

     manpath -- display search path for manual pages

SYNOPSIS

     manpath [-Ldq]

DESCRIPTION

     The manpath utility determines the user's manual search path from the user's PATH, and local configuration files.	This result is echoed to
     the standard output.

     -L  Output manual locales list instead of the manual path.

     -d  Print extra debugging information.

     -q  Suppresses warning messages.

IMPLEMENTATION NOTES

     The manpath utility constructs the manual path from two sources:
     1.   From each component of the user's PATH for the first of:
	  -   pathname/man
	  -   pathname/MAN
	  -   If pathname ends with /bin: pathname/../man
	  Note: Special logic exists to make /bin and /usr/bin look in /usr/share/man for manual files.
     2.   The configuration files listed in the FILES section for MANPATH entries.
     The information from these locations is then concatenated together.

     If the -L flag is set, the manpath utility will search the configuration files listed in the FILES section for MANLOCALE entries.

ENVIRONMENT

     The following environment variables affect the execution of manpath:

     MANLOCALES  If set with the -L flag, causes the utility to display a warning and the value, overriding any other configuration found on the
		 system.

     MANPATH	 If set, causes the utility to display a warning and the value, overriding any other configuration found on the system.

     PATH	 Influences the manual path as described in the IMPLEMENTATION NOTES.

FILES

     /etc/man.conf
	     System configuration file.
     /usr/local/etc/man.d/*.conf
	     Local configuration files.

SEE ALSO

     apropos(1), man(1), whatis(1), man.conf(5)

BSD
								 September 1, 2010							       BSD
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