07-21-2009
How commands are executing ?
Hi Folks,
I have a small doubt, the binary commands under /bin and /sbin as well as other path binary files, if you peek deep into that, you can find the difference in the way of normal perl programming and some commands will be like binary files. how are the commands executing like the difference in perl scripting and binary files.
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LEARN ABOUT ULTRIX
whereis
whereis(1) General Commands Manual whereis(1)
Name
whereis - locate source, binary, and or manual for program
Syntax
whereis [-sbm] [-u] [-SBM dir... -f] name...
Description
The command locates source/binary and manuals sections for specified files. The supplied names are first stripped of leading pathname com-
ponents and any (single) trailing extension of the form ``.ext'', for example,``.c''. Prefixes of ``s.'' resulting from use of source code
control are also dealt with. The command then attempts to locate the desired program in a list of standard places.
Options
-S dir
Search for source files in specified directory.
-B dir
Search for binary files in given directory.
-M dir
Search for manual section files in given directory.
-b Searches only for binary files.
-f Terminates last directory list created from use of -S, -B or -M flags and signals the start of file names.
-m Searches only for manual section files.
-s Searches only for source files.
-u Searches for files that do not have one of binary, source or manual section files. A file is said to be unusual if it does not have one
entry of each requested type. Thus ``whereis -m -u *'' asks for those files in the current directory which have no documentation.
Examples
The following finds all the files in which are not documented in with source in
cd /usr/ucb
whereis -u -M /usr/man/man1 -S /usr/src/cmd -f *
Restrictions
Since the program uses to run faster, pathnames given with the -M -S and -B must be full. That is, they must begin with a ``/''.
Files
/usr/src/*
/usr/{doc,man}/*
/lib, /etc, /usr/{lib,bin,ucb,old,new,local}
whereis(1)