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Full Discussion: help running strace
Top Forums UNIX for Advanced & Expert Users help running strace Post 302090264 by jason296 on Sunday 24th of September 2006 01:52:31 PM
Old 09-24-2006
can u answer me.
Use strace to monitor what happens when the user creates a pipe as follows:

grep <pattern> <file> | sort

According to their man pages, both grep(1) and sort(1) process data on a line-by-line basis. Keeping this in mind, answer the following questions in a plain text file called answers.txt:

1. How does the grep process output data into the pipe according to the strace output? Please explain the behaviour you observe.
2. How does the sort process read data from the pipe according to the strace output? Please explain the behaviour you observe.
3. Does sort write the final result on a line-by-line basis according to the strace output? Please explain the behaviour you observe.

Hint: please make sure that you use appropriate input file for grep, i.e. one that is large enough, and an appropriate search pattern, which matches often enough.
 

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LEARN ABOUT MINIX

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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