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Top Forums Shell Programming and Scripting Unix Scripting : Sort a Portion of a File and not the complete file Post 302681259 by Don Cragun on Friday 3rd of August 2012 05:05:48 AM
Old 08-03-2012
The command
Code:
print | "sort"

opens up a pipe to a sort command (if a sort command isn't already running) and writes the current input line to it.

The command
Code:
close("sort")

closes the pipe and flushes the output from the sort command to standard output.
This is done whenever a pipe to sort is open and either a line starting with "#" is found or the end of the input is found.

So, any line starting with "#" is written directly to standard output by the awk script and any set of lines between lines starting with "#" are piped through sort before being written to standard output.
This User Gave Thanks to Don Cragun For This Post:
 

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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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