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Full Discussion: Sed command in shell script
Top Forums Shell Programming and Scripting Sed command in shell script Post 302211960 by stevie_velvet on Saturday 5th of July 2008 01:15:18 PM
Old 07-05-2008
So before your sed, you need to test if the string exists in the file, something like


grep -q "String" <filename> >& /dev/null

if ($status == 0) then
echo "String exist, do something"
else
echo "do something else or exit" >> <filename>
endif


syntax neeeds clearing up bu the skeletal is there & a more elegant 1 line job (.e.e. perl) may be around too
 

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Boulder::String(3pm)					User Contributed Perl Documentation				      Boulder::String(3pm)

NAME
Boulder::String - Read and write tag/value data from a string. SYNOPSIS
#!/bin/perl # Read a B<Stone> from stdin and create a string that can be # passed to a dumb sub, which doesn't know about Stones. use Boulder::Stream; use Boulder::String; my $stream = Boulder::Stream->newFh; # read a stone from stdin my $record = <$stream> ); print $stream $record; } DESCRIPTION
Boulder::String provides access to Boulder IO hierarchical tag/value data. Stone objects printed to the tied string are appended to the string in Boulder format. Boulder::Stream METHODS $stream = Boulder::Stream->new($in_string,$out_string); The new() method creates a new Boulder::String object. You must provide an input string and a reference to an output string. The input string may be empty. $stream->write_record($stone) Write the passed stone in Boulder IO format into $out_string. AUTHOR
Lincoln D. Stein <lstein@cshl.org>, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY. This module can be used and distributed on the same terms as Perl itself. Patches and bug fixes contributed by Bernhard Schmalhofer <bernhard@biomax.de>. SEE ALSO
Boulder, Boulder::Stream, Boulder::Blast, Boulder::Genbank, Boulder::Medline, Boulder::Unigene, Boulder::Omim, Boulder::SwissProt perl v5.10.1 2000-12-04 Boulder::String(3pm)
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