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Full Discussion: Cutting specific lines from a file
Top Forums Shell Programming and Scripting Cutting specific lines from a file Post 73520 by bakunin on Thursday 2nd of June 2005 09:45:51 AM
Old 06-02-2005
You told us you want everything except for the last and the first line, but presented us a 5-line file in your first post. Does this mean you want to skip all empty lines?

Supposing you want empty lines to go into your result (this would yield not only the line "my name is mani" in you first example, but also the two empty lines surrounding it) you could use:

# cat <file> | sed -n '1d; $d; p'

This will ignore the last and first line and print out everything else. In case you want to skip empty lines (lines containing only whitespace) too:

# cat <file> | sed -n '1d; $d; /^[<blank><tab>]*$/d; p'

To display the first/last line is trivial and could be done by sed too, but you have gotten a working solution already. To display the first nonblank line use:

# cat <file> | sed -n '/^[<blank><tab>]*$/d; /^..*$/ {; p; q;}'

You should be able to work out the solution for the last nonblank line now for yourself. "<blank>" and "<tab>" in the text above is to be replaced by literal blanks and tabs of course.

bakunin
 

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LEARN ABOUT DEBIAN

binfmt.d

BINFMT.D(5)							     binfmt.d							       BINFMT.D(5)

NAME

       binfmt.d - Configure additional binary formats at boot

SYNOPSIS

       /etc/binfmt.d/*.conf

       /run/binfmt.d/*.conf

       /usr/lib/binfmt.d/*.conf

DESCRIPTION

       systemd uses files from the above directories to configure additional binary formats to register during boot in the kernel.

CONFIGURATION FORMAT

       Each file contains a list of binfmt_misc kernel binary format rules. Consult binfmt_misc.txt[1] for more information on registration of
       additional binary formats and how to write rules.

       Empty lines and lines beginning with ; and # are ignored. Note that this means you may not use ; and # as delimiter in binary format rules.

       Each configuration file is named in the style of <program>.conf. Files in /etc/ overwrite files with the same name in /usr/lib/. Files in
       /run overwrite files with the same name in /etc/ and /usr/lib/. Packages should install their configuration files in /usr/lib/, files in
       /etc/ are reserved for the local administration, which possibly decides to overwrite the configurations installed from packages. All files
       are sorted by filename in alphabetical order, regardless in which of the directories they reside, to ensure that a specific configuration
       file takes precedence over another file with an alphabetically later name.

EXAMPLE

       Example 1. /etc/binfmt.d/wine.conf example:

	   # Start WINE on Windows executables
	   :DOSWin:M::MZ::/usr/bin/wine:

SEE ALSO

       systemd(1), wine(8)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

NOTES

	1. binfmt_misc.txt
	   http://www.kernel.org/doc/Documentation/binfmt_misc.txt

systemd 							    10/07/2013							       BINFMT.D(5)
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