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Full Discussion: How to write script in bash.
Homework and Emergencies Homework & Coursework Questions How to write script in bash. Post 302441654 by alobi on Monday 2nd of August 2010 01:48:27 AM
Old 08-02-2010
Question How to write script in bash.

I am very new to Linux/Unix. Kindly assist the following:

I wish to write a bash shell script called how_many_to_go that calculates and prints the number of days, hours, minutes and/or seconds until the end of the current month (based on the output of the date command).

  • Do not make any assumptions about what month it is - the script should run properly in any month.
  • Assume that it is not a leap year, so the number of days in any month is known (February has 28 days; April, June, September, and November have 30 days; All the rest have 31 days).
  • The output should read "There are d days, h hours, m minutes, and s seconds until the end of the month" except as modified by the command line arguments below.
  • The script should accept command line arguments as follows (assume that it's now 11:00:00 PM on January 30):
    • how_many_to_go - print the number of days, hours, minutes, and seconds until the end of the month (e.g. "There are 1 days, 1 hours, 0 minutes, and 0 seconds until the end of the month")
    • how_many_to_go h - print the number of hours, minutes, and seconds until the end of the month (e.g. "There are 25 hours, 0 minutes, and 0 seconds until the end of the month")
    • how_many_to_go m- print the number of minutes and seconds until the end of the month (e.g. "There are 1500 minutes and 0 seconds until the end of the month")
    • how_many_to_go s - print the number of seconds until the end of the month (e.g. "There are 90000 seconds until the end of the month")


Kenyatta University Kenya. Lecturer: Dr. Waweru Michael. Course Code. BBIT 202.

Regards
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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