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Top Forums Shell Programming and Scripting A twisted feature of sort when called in awk Post 302377512 by radoulov on Friday 4th of December 2009 08:46:40 AM
Old 12-04-2009
Quote:
Originally Posted by nrgbooster
If this is the case how "sort" can know the end of data it is to process? For example, if we run "cat file | sort" in shell the second command sort will get the entire input (at least I felt so) from cat before it kicks off.
No, as you say sort needs the entire input in order to be able to produce the final result, but it's the sort command that does the job (manages/accumulates the input). It starts executing right after the pipe opens, that's what I meant.

If by kicks off you mean begins sorting the data - may be - but I'm not sure, I don't know if it sorts the already received chunks before producing the final output.

That's why the Unix pipelines are so efficient, because the connected programs actually run in parallel (think about the programs that don't need the entire input in order to begin their work).
 

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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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