08-12-2009
Hint 1: Generally, all files that aren't intended to be changed by a normal user can be considered worth watching. Think configuration files and bin directories.
Hint 2: A good indication of change can be found by using cryptographic hashing functions
Hint 3: A Tripwire can tell you when something is happening.
Yes, I'm being sketchy on purpose
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ACFCFACCACARCSHFARCVJVASTVAJFTVAJVGHBAJ
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A
C
F
R
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C=7
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cal(1) General Commands Manual cal(1)
NAME
cal - Displays a calendar
SYNOPSIS
cal [month [year]]
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
cal: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
None
OPERANDS
Names the month for which you want the calendar. It can be a number between 1 and 12 for January through December, respectively. If month
is not specified, cal displays a calendar for the entire year, unless year is also omitted. Names the year for which you want the calen-
dar. Because cal can display a calendar for any year from 1 to 9999, enter the full year rather than just the last two digits. If year is
not specified, cal uses the current year.
If no operands are specified, cal displays a calendar for the current month.
DESCRIPTION
The cal command writes to standard output a Gregorian calendar for the specified year or month.
For historical reasons, the cal command's Gregorian calendar is discontinuous. The display for September 1752 (cal 9 1752) jumps from
Wednesday the 2nd to Thursday the 14th.
The cal command checks the LC_TIME environment variable and uses the correct headers for the current locale. If LC_TIME is not set, cal
checks the value of LANG. If neither variable is set, you receive English headers.
EXIT STATUS
The following exit values are returned: Successful completion. An error occurred.
EXAMPLES
To display a calendar for February 1990, enter: cal 2 1990 To display a calendar for the year 84 A.D., enter: cal 84 To display a calendar
for the current month, enter: cal
ENVIRONMENT VARIABLES
The following environment variables affect the execution of *cmd*: Provides a default value for the internationalization variables that are
unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari-
ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value,
overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes
of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale for the for-
mat and contents of diagnostic messages written to standard error. Determines the format and contents of the calendar. Determines the
location of message catalogues for the processing of LC_MESSAGES. Determines the time zone used to calculate the value of the current
month.
SEE ALSO
Commands: date(1)
Files: locale(4)
Standards: standards(5)
Command and Shell User's Guide
cal(1)