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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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pr(1) [bsd man page]

PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ] ... [ file ] ... DESCRIPTION
Pr produces a printed listing of one or more files. The output is separated into pages headed by a date, the name of the file or a speci- fied header, and the page number. If there are no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -h Take the next argument as a page header. -wn For purposes of multi-column output, take the width of the page to be n characters instead of the default 72. -f Use formfeeds instead of newlines to separate pages. A formfeed is assumed to use up two blank lines at the top of a page. (Thus this option does not affect the effective page length.) -ln Take the length of the page to be n lines instead of the default 66. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -sc Separate columns by the single character c instead of by the appropriate amount of white space. A missing c is taken to be a tab. -m Print all files simultaneously, each in one column, Inter-terminal messages via write(1) are forbidden during a pr. FILES
/dev/tty? to suspend messages. SEE ALSO
cat(1) DIAGNOSTICS
There are no diagnostics when pr is printing on a terminal. 4th Berkeley Distribution April 29, 1985 PR(1)

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pr(1)							      General Commands Manual							     pr(1)

Name
       pr - print files

Syntax
       pr [ options ] [ files ]

Description
       The  command  prints  the  named files on the standard output.  If file is designated by a minus sign (-), or if no files are specified the
       command assumes standard input.	By default, the listing is separated into pages, each headed by the page number, a date and time, and  the
       name of the file.

       By default, columns are of equal width, separated by at least one space.  Lines that do not fit are truncated. However, if the -s option is
       used, lines are not truncated and columns are separated by the separation character.

       If the standard output is associated with a terminal, error messages are withheld until has finished printing.

Options
       The following options can be used singly or in combination:

       -a      Prints multi-column output across the page.

       -b      Prints blank headers.

       -d      Double-spaces the output.

       -eck    Expands input tabs to character positions k+1, 2*k+1, 3*k+1,... n*k+1.  If k is 0 or is omitted, tabs are set at every eighth posi-
	       tion.  Tab characters in the input are expanded into the appropriate number of spaces.  The default for c (any non-digit character)
	       is the tab character; therefore, if c is given, it is treated as the input tab character.

       -f      Uses form-feed character for new pages.	The default is to use a sequence of line-feeds.  The -f option causes the command to pause
	       before beginning the first page if the standard output is associated with a terminal.

       -h      Uses the next argument as the header to be printed instead of the file name.

       -ick    Replaces  white space in output by inserting tabs to character positions k+1, 2*k+1, 3*k+1,...n*k+1.  If k is 0 or is omitted, tabs
	       are set at every eighth position.  The default for c (any non-digit character) is the tab character; therefore, if c is	given,	it
	       is treated as the input tab character.

       +k      Begins printing with page k (default is 1).

       -k      Produces k-column output (default is 1).  The -e and -i options are assumed for multi-column output.

       -lk     Sets the length of a page to k lines.  The default is 66 lines.

       -m      Merges and prints all files simultaneously, one per column (overrides the -k, and -a options).

       -nck    Numbers	lines.	The default for k is 20.  The number occupies the first k+1 character positions of each column of normal output or
	       each line of -m output.	If c, which is any non-digit character is given, it is appended to the line number  to	separate  it  from
	       whatever follows.  The default for c is a tab.

       -ok     Offsets	each line by k character positions (default is 0).  The number of character positions per line is the sum of the width and
	       offset.

       -p      Pauses before beginning each page if the output is directed to a terminal.  The command rings the bell at the terminal and awaits a
	       carriage return.

       -r      Suppresses diagnostic reports on failure to open files.

       -sc     Separates columns by the single character c instead of by the appropriate number of spaces (default for c is a tab).

       -t      Suppresses  the	five-line  identifying header and the five-line trailer normally supplied for each page.  The -t option causes the
	       command to quit printing after the last line of each file without spacing to the end of the page.

       -wk     Sets the width of a line to k character positions.  The default is 72 for equal-width multi-column output; otherwise  there  is	no
	       limit.

Examples
       Print file1 and file2 as a double-spaced, three-column listing with the heading:  file list.
       pr -3dh "file list" file1 file2
       Write file1 on file2, expanding tabs to columns 10, 19, 28, 37,...:
       pr -e9 -t <file1>file2

Files
       /dev/tty* to suspend messages

See Also
       cat(1)

																	     pr(1)

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