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Full Discussion: sorting
Top Forums Shell Programming and Scripting sorting Post 302490440 by otheus on Monday 24th of January 2011 08:43:27 PM
Old 01-24-2011
Alas, sort doesn't know how to skip lines. You must extract the first line separately, then sort the rest, then add it back later:
Code:
{ head -1 file.txt ; tail +2 file.txt | sort -u ; } >file1.txt

The tail +2 extracts the file starting from the 2nd line. You can "group" the output of all the commands contained within curly-braces.
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readahead(8)						      System Manager's Manual						      readahead(8)

NAME
readahead - file preloader for boot process optimization SYNOPSIS
readahead [options] <file-list> [another-file-list [...]] DESCRIPTION
readahead is a files preloader designed to optimize the disk I/O during the boot process. OPTIONS
-b, --build build optimised files list only, without sorting. -s, --sort build and sort list of files only (implies -b). -o, --output <file> write sorted list of files to file. -d, --dont-sort preload files described by an already sorted files list. -h, --help print the usage information. -v, --verbose enable the verbose mode. -t, --timing report time spent on each operation. -m, --maxsize <max size> maximum size in KiB a file can be in order to be preloaded, default is 10240. <file-list> [another-file-list [...]] One or more files containing the list of files to be preloaded or sorted. The files list can be generated by readahead-collector(8). FILES
/etc/default/readahead-fedora SEE ALSO
readahead-collector(8), readahead(2), AUTHORS
Arjan van de Ven <arjan@infradead.org>, Ziga Mahkovec <ziga.mahkovec@klika.si>, Karel Zak <kzak@redhat.com>, This manual page was written by Raphael Geissert <geissert@debian.org> July 2011 readahead(8)
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