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Full Discussion: sed - combination of line deletion and pattern matching
Top Forums UNIX for Dummies Questions & Answers sed - combination of line deletion and pattern matching Post 302682015 by Don Cragun on Sunday 5th of August 2012 07:40:34 AM
Old 08-05-2012
Quote:
Originally Posted by bakunin
"function" is probably meant recursively. A function itself is a list of commands and may contain other functions as well. This is a principle in probably any programming language.

To be honest i haven't read the POSIX standard papers as intensively as you seem to have done, so i can only guess. What i have explained above is true for all the sed-variants i have ran across in my nearly 30 years of Unix, so even if my explanation is not completely POSIXly-correct it seems to cover the truth from a practical point of view.

Still, i would be interested if you could find out how it is really supposed to work as i would prefer to be sure instead of almost sure. It seems like you could shed some light on it.

I hope this helps.

bakunin
Check your local sed(1) man page... I bet it'll say something like:
Quote:
The form of a sed command is as follows:
[address[,address]]function[arguments]
And later give a list of sed functions and the number of addresses that need to be supplied with them to form a command.

I'll post a question to the POSIX mailing list to see if I can find an example where:
Quote:
[2addr]{command
command
...
}
doesn't work.
 

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LEARN ABOUT LINUX

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
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