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Full Discussion: help running strace
Top Forums UNIX for Advanced & Expert Users help running strace Post 302089994 by Corona688 on Thursday 21st of September 2006 11:14:12 PM
Old 09-22-2006
strace has absolutely no idea how to set up pipes for anything, it only runs one process. The strace bit only goes as far as 'grep blah myfile', after which point the shell breaks your statement in half. sort is run by itself without the benefit of an strace.

How about:
Code:
strace grep blah myfile 2> grep.strace | strace sort 2> sort.strace

The relation between what's written into a pipe and what's read from a pipe is identical. You have
Code:
write(1, "blah blah and blah cause of blah"..., 85) = 85

on grep's side, and on sort's side you'll have something like
Code:
read( 0, "blah blah and blah cause of blah"..., 32768) = 85

The pipe waits until the writing process has written an '\n' somewhere, or the pipe's buffer is totally filled, before the other process stops waiting and gets to read any of it.

Last edited by Corona688; 09-22-2006 at 12:27 AM..
 

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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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