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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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script(1)						      General Commands Manual							 script(1)

NAME
script - Makes a transcript of terminal session SYNOPSIS
script [-a] [file] The script command makes a transcript of everything printed on your terminal. OPTIONS
Appends the transcript to file rather than writing it to file. OPERANDS
The name of an output file that will contain the transcript of the session. If this parameter is omitted, the file typescript is written. DESCRIPTION
The transcript is written to file, or appended to file if the -a option is given. If no file name is given, the transcript is saved in the file typescript. The script ends when the forked shell exits. This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create an example of a working session this way). If you specify the -a option and the file does not exist, it is created. If you do not specify the -a option and the file exists, it is replaced. RESTRICTIONS
The script command requires a streams based terminal. In single user mode, streams may not be enabled. Under these circumstances, script will exit with no action. If you are the superuser and need to run this command in single user mode, use the following special instruc- tions. Enabling Streams If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams. This command is avail- able to the superuser only. SEE ALSO
Commands: autopush(8), cat(1), echo(1), strsetup(8), tee(1) System Administration script(1)
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