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Test Your Knowledge in Computers #913
Difficulty: Medium
In bash, grep -v -e '^[[:space:]]*$' filename.txt will filter all the blank lines from filename.txt and display the results.
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calendar(1) [bsd man page]

CALENDAR(1)						      General Commands Manual						       CALENDAR(1)

calendar - reminder service SYNOPSIS
calendar [ - ] DESCRIPTION
Calendar consults the file `calendar' in the current directory and prints out lines that contain today's or tomorrow's date anywhere in the line. Most reasonable month-day dates such as `Dec. 7,' `december 7,' `12/7,' etc., are recognized, but not `7 December' or `7/12'. If you give the month as ``*'' with a date, i.e. ``* 1'', that day in any month will do. On weekends `tomorrow' extends through Monday. When an argument is present, calendar does its job for every user who has a file `calendar' in his login directory and sends him any posi- tive results by mail(1). Normally this is done daily in the wee hours under control of cron(8). The file `calendar' is first run through the ``C'' preprocessor, /lib/cpp, to include any other calendar files specified with the usual ``#include'' syntax. Included calendars will usually be shared by all users, maintained and documented by the local administration. FILES
calendar /usr/libexec/calendar to figure out today's and tomorrow's dates /etc/passwd /tmp/cal* /lib/cpp, egrep, sed, mail as subprocesses SEE ALSO
at(1), cron(8), mail(1) BUGS
Calendar's extended idea of `tomorrow' doesn't account for holidays. 7th Edition October 21, 1996 CALENDAR(1)

Check Out this Related Man Page

CALENDAR(1)						      General Commands Manual						       CALENDAR(1)

calendar - reminder service SYNOPSIS
calendar [-] [-r] OPTIONS
- Work for every user and send mail to him -r Restrict multiple execution on the same day EXAMPLES
calendar # Check calendar file in current directory calendar # Normary used under the control of cron(8) calendar -r # Normary used in /etc/rc file DESCRIPTION
Basically calendar program consults the file calendar in the current directory and display lines which contain today's or tomorrow's date. Month-day formats such as '12/25', 'Dec. 25', 'december 25', '*/25', '12/*', '*/*' are recognized. The asterisk means 'all' days or 'all' months. On weekends 'tomorrow' extends through next Monday without any consideration about holidays. To prevent ambiguity, the formats '25 Dec.' and '25/12' are not recognized. When an argument - is present, calendar works for all users with a file calendar in their login directories and sends them mail. Normally this is done daily under the control of cron. The -r option does its the same job as - option, but touches the calendar to prevents further access on the same day. Normally this is done in the /etc/rc file on a machine which may be booted several times in one day. SEE ALSO
cron(8). CALENDAR(1)

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