03-09-2009
writing a shell script of commands
Can anyone help me out in visualizing on what is the logic behind simple unix commands. For Eg: ls command lists files and directories, how it displays I need to know the source code for commands like this.
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dircmp(1) General Commands Manual dircmp(1)
NAME
dircmp - Compares two directories
SYNOPSIS
dircmp [-d] [-s] directory1 directory2
The dircmp command reads directory1 and directory2, compares their contents, and writes the results to standard output.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
dircmp: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
Displays for each common file name the differing contents of the two files, if any. The display format is the same as that of the diff
command. Does not list the names of identical files.
OPERANDS
The path name of a directory to be compared.
DESCRIPTION
First, dircmp compares the file names in each directory. When the same file name appears in both, dircmp compares the contents of the two
files.
In the output, dircmp lists the files unique to each directory. It then lists the files with identical names but different contents. If
entered without a option, dircmp also lists files that have both identical names and identical contents.
NOTES
[Tru64 UNIX] In many cases, diff -r, rather than dircmp, is preferred. The dircmp command is marked LEGACY. The diff -r command should
be used instead.
EXAMPLES
To summarize the differences between the files in two directories, enter: dircmp proj.ver1 proj.ver2
This displays a summary of the differences between the directories proj.ver1 and proj.ver2. The summary lists separately the files
found only in one directory or the other, and those found in both. If the file is found in both directories, the file is listed.
If the files are identical, dircmp displays identical; otherwise, dircmp displays different. To show the details of the differences
between files, enter: dircmp -d -s proj.ver1 proj.ver2
The -s option suppresses information about identical files. The -d option displays a diff listing for each of the differing files
found in both directories.
SEE ALSO
Commands: cmp(1), diff(1)
Standards: standards(5)
dircmp(1)