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Top Forums Shell Programming and Scripting Implementing MORE,HEAD & TAIL Post 55768 by zazzybob on Sunday 19th of September 2004 04:22:59 PM
Old 09-19-2004
Unless you actually want to rewrite the commands in C, you'll be hard pushed to get all of the required funcitonality using shell scripts...

You can use a simple " sed -n '1,10p' foofile " to print the first 10 lines of foofile, (thus mimicking "head foofile") but why would you want to reimplement this? (Unless of course, you are trying to further your programming knowledge)

Cheers
ZB
 

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HEAD(1) 							   User Commands							   HEAD(1)

NAME
head - output the first part of files SYNOPSIS
head [OPTION]... [FILE]... DESCRIPTION
Print the first 10 lines of each FILE to standard output. With more than one FILE, precede each with a header giving the file name. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -c, --bytes=[-]K print the first K bytes of each file; with the leading `-', print all but the last K bytes of each file -n, --lines=[-]K print the first K lines instead of the first 10; with the leading `-', print all but the last K lines of each file -q, --quiet, --silent never print headers giving file names -v, --verbose always print headers giving file names --help display this help and exit --version output version information and exit K may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y. AUTHOR
Written by David MacKenzie and Jim Meyering. REPORTING BUGS
Report head bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report head translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for head is maintained as a Texinfo manual. If the info and head programs are properly installed at your site, the command info coreutils 'head invocation' should give you access to the complete manual. GNU coreutils 8.12.197-032bb September 2011 HEAD(1)
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