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Top Forums Shell Programming and Scripting need to delete lines that start with letters Post 302322724 by sfisk on Thursday 4th of June 2009 11:57:35 AM
Old 06-04-2009
need to delete lines that start with letters

Hi,

I need to remove all lines from a file that do not start with numbers

For instance, if the first three characters on any line are not numbers, delete those lines

I've tried to do it with awk and it's not working, any ideas ?

Thanks
 

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NL(1)									FSF								     NL(1)

NAME
nl - number lines of files SYNOPSIS
nl [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, with line numbers added. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --body-numbering=STYLE use STYLE for numbering body lines -d, --section-delimiter=CC use CC for separating logical pages -f, --footer-numbering=STYLE use STYLE for numbering footer lines -h, --header-numbering=STYLE use STYLE for numbering header lines -i, --page-increment=NUMBER line number increment at each line -l, --join-blank-lines=NUMBER group of NUMBER empty lines counted as one -n, --number-format=FORMAT insert line numbers according to FORMAT -p, --no-renumber do not reset line numbers at logical pages -s, --number-separator=STRING add STRING after (possible) line number -v, --first-page=NUMBER first line number on each logical page -w, --number-width=NUMBER use NUMBER columns for line numbers --help display this help and exit --version output version information and exit By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn. CC are two delimiter characters for separating logical pages, a missing second character implies :. Type \ for . STYLE is one of: a number all lines t number only nonempty lines n number no lines pREGEXP number only lines that contain a match for REGEXP FORMAT is one of: ln left justified, no leading zeros rn right justified, no leading zeros rz right justified, leading zeros AUTHOR
Written by Scott Bartram and David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for nl is maintained as a Texinfo manual. If the info and nl programs are properly installed at your site, the com- mand info nl should give you access to the complete manual. nl (coreutils) 4.5.3 February 2003 NL(1)
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