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Sixth-Semester-BE-Degree-Examination-JuneJuly-2013-UNIX-System-Programming-->View question


Asked On2017-06-05 09:19:53 by:Aparna-Dasgupta

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 Apropos:  In computing, apropos is a command to search the man page files in Unix and Unix-like operating systems. apropos     takes  its name from the English word with the same spelling that means relevant. It is particularly useful when searching for commands   without knowing their exact names.

 Apropos searches a set of database files containing short descriptions of system commands for keywords and displays the result on the standard output.

Usage :

apropos [-dalhvV] [-e|-w|-r] [-s list] [-m system[,…]] keyword …

Options :

-d, –debug
Print debugging information.
-v, –verbose
Print verbose warning messages.
-r, –regex
Interpret each keyword as a regular expression. This is the default behavior. Each keyword will be matched against the page names and the descriptions indepenently. It can match any part of either. The match is not limited to word boundaries.
-w, –wildcard
Interpret each keyword as a pattern containing shell-style wildcards. Each keyword will be matched against the page names and the descriptions independently. If –exact is also used, a match will only be found if an expanded keyword matches an entire description or page name. Otherwise the keyword is also allowed to match on word boundaries in the description.
-e, –exact
Each keyword will be exactly matched against the page names and the descriptions.
-a, –and
Only display items that match all the supplied keywords. The default is to display items that match any keyword.
-l, –long
Do not trim output to the terminal width. Normally, output will be truncated to the terminal width to avoid ugly results from poorly-written NAME sections.
-s list, –sections list, –section list
Search only the given manual sections. list is a colon- or comma-separated list of sections. If an entry in list is a simple section, for example “3”, then the displayed list of descriptions will include pages in sections “3”, “3perl”, “3x”, and so on; while if an entry in list has an extension, for example “3perl”, then the list will only include pages in that exact part of the manual section.
-h, –help
Print a help message and exit.
-V, –version
Display version information.

 

Whatis:The whatis command is similar to apropos except that it searches only for whole words that match the keywords, and it ignores parts of longer words that match the keywords. Thus, whatis is particularly useful if it is desired to obtain a brief description only about a specific command whose exact name is already known.
 



Answerd on:2018-06-04 Answerd By:SaiKiran

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  apropos is a command to search the man page files in Unix and Unix-like operating systems. apropos takes its name from the English word with the same spelling that means relevant. It is particularly useful when searching for commands without knowing their exact names.
The following example:
free (1)             - Display amount of free and used memory in the system
mklost+found (8)     - create a lost+found directory on a mounted Linux second extended file system
mount (8)            - mount a file system
mountpoint (1)       - see if a directory is a mountpoint
ntfsmount (8)        - Read/Write userspace NTFS driver.
sleep (1)            - delay for a specified amount of time
switch_root (8)      - switch to another filesystem as the root of the mount tree.
umount (8)           - unmount file systems
In this example, apropos is used to search for the keyword "mount", and apropos returns the indicated man pages that include the term "mount".
 Unix and shell program:-Simply put, a shell program  is a text file that contains standard UNIX and shell commands. Each line in a shell program contains a single UNIX command exactly as if you had typed them in yourself. The difference is that you can execute all the commands in a shell program simply by running the shell program.
Shell programs are interpreted and not compiled programs. This means when you run a shell program a child shell is started. This child shell reads each line in the shell program and carries out the command on that line. When it has read all the commands the child shell finishes.
To create a shell program you need to complete the following steps:
create a text file to hold the shell program
decide which shell you will use
add the required commands to the file
save the file
change the permissions on the file so it is executable
run the shell program


Answerd on:2018-06-04 Answerd By:aksingh1818

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