04-08-2013
Using cal in a script
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1. The problem statement, all variables and given/known data:
Write a shell script that will:
"Display" the number of days in the current month. For example: September 1996 has 30 days
2. Relevant commands, code, scripts, algorithms:
We are supposed to use "cal"
3. The attempts at a solution (include all code and scripts):
I have started with:
cal | head -n 1
to get the month as the first part of the sentence. I need to figure out how to do a word count of the cal output and subtract 9 with bc to get the number of days.
4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Pima Community College, Tucson AZ, USA, Barry Tucker, CIS 137
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).
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cal(1) User Commands cal(1)
NAME
cal - display a calendar
SYNOPSIS
cal [ [month] year]
DESCRIPTION
The cal utility writes a Gregorian calendar to standard output. If the year operand is specified, a calendar for that year is written. If
no operands are specified, a calendar for the current month is written.
OPERANDS
The following operands are supported:
month Specify the month to be displayed, represented as a decimal integer from 1 (January) to 12 (December). The default is the current
month.
year Specify the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default is the current
year.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cal: LANG, LC_ALL, LC_CTYPE, LC_TIME,
LC_MESSAGES, and NLSPATH.
TZ Determine the timezone used to calculate the value of the current month.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWesu |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
calendar(1), attributes(5), environ(5), standards(5)
NOTES
An unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments. To
see this calendar, type:
cal 9 1752
The command cal 83 refers to the year 83, not 1983.
The year is always considered to start in January.
SunOS 5.10 1 Feb 1995 cal(1)