01-27-2006
wc -l filename | awk '{ printf "%d",$1-20'} | xargs -I {} head -{} filename
or
sed -n "1,$(($(wc -l file1 | awk '{print $1'})-20)) p" filename
try the second one in ksh
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LEARN ABOUT DEBIAN
asntool
ASNTOOL(1) NCBI Tools User's Manual ASNTOOL(1)
NAME
asntool - process ASN.1 module specifications
SYNOPSIS
asntool [-] [-B filename] [-D N] [-G] [-I str] [-J type] [-K str] [-L str] [-M filename,...] [-P str] [-Q] [-S filename] [-T filename] [-V]
[-X filename] [-Z] [-b N] [-d filename] [-e filename] [-f filename] [-l filename] -m filename [-o filename] [-p filename] [-t str]
[-v filename] [-w N] [-x filename]
DESCRIPTION
asntool reads, validates, and displays ASN.1 module specifications.
OPTIONS
A summary of options is included below.
- Print usage message
-B filename
Generate objects and code in files named filename.*
-D N Debugging level for code generation:
0 No debugging (default)
1 Shallow debugging
2 Deep debugging
3-9 Same as 2
-G Generate object loader .c and .h files
-I str Put "#include str" in generated .c file
-J type
Register type type with object manager
-K str In generated .c, force name of #included asn header to str
-L str Label registered type as str
-M filename,...
Search the ASN.1 modules in filename,... for external references
-P str XML module prefix for DOCTYPE
-Q Use quoted syntax form for generated include files
-S filename
Send debugging output to filename rather than stderr
-T filename
Dump ASN.1 tree to filename
-V Force CHOICE objects to use custom structures rather than ValNodePtrs, for compatibility with some old hand-coded object loaders.
-X filename
Write XML DTD to filename. If filename is "m", print each module to a separate file.
-Z Bit twiddle for optional zero value base slots
-b N Use N-byte buffers (default = 1024; anything between 512 and 10000 is legal)
-d filename
Read binary values from filename (requires -t)
-e filename
Write binary values to filename
-f filename
Write ASN.1 module to filename
-l filename
Write ASN.1 loader to filename
-m filename
Read ASN.1 module from filename
-o filename
Write header to filename
-p filename
Write print values to filename
-t str Expect binary values to have type str
-v filename
Read print values from filename
-w N Limit values in #defines to N bits (default = 31; anything between 31 and 128 is legal)
-x filename
Write XML data to filename
AUTHOR
The National Center for Biotechnology Information.
NCBI
2010-09-01 ASNTOOL(1)