<p>
Examples on <a href="https://en.wikipedia.org/wiki/Sort_(Unix)">Wikipedia</a>
</p>

<p>

From <a href="https://www.unix.com/man-page/Linux/1/sort/">https://www.unix.com/man-page/Linux/1/sort/</a> and on your computer <strong>man sort</strong>
</p>
<pre>

<b>NAME</b> 
       sort - sort lines of text files
 
<b>SYNOPSIS</b> 
       sort [OPTION]... [FILE]...
       sort [OPTION]... <b><i>--files0-from=F
</i></b> 
<b>DESCRIPTION</b> 
       Write sorted concatenation of all FILE(s) to standard output.
 
       Mandatory  arguments  to  long  options are mandatory for short options
       too.  Ordering options:
 
       <b><i>-b</i></b>, <b><i>--ignore-leading-blanks
</i></b>	      ignore leading blanks
 
       <b><i>-d</i></b>, <b><i>--dictionary-order
</i></b>	      consider only blanks and alphanumeric characters
 
       <b><i>-f</i></b>, <b><i>--ignore-case
</i></b>	      fold lower case to upper case characters
 
       <b><i>-g</i></b>, <b><i>--general-numeric-sort
</i></b>	      compare according to general numerical value
 
       <b><i>-i</i></b>, <b><i>--ignore-nonprinting
</i></b>	      consider only printable characters
 
       <b><i>-M</i></b>, <b><i>--month-sort
</i></b>	      compare (unknown) < `JAN' < ... < `DEC'
 
       <b><i>-n</i></b>, <b><i>--numeric-sort
</i></b>	      compare according to string numerical value
 
       <b><i>-R</i></b>, <b><i>--random-sort
</i></b>	      sort by random hash of keys
 
       <b><i>--random-source=FILE
</i></b>	      get random bytes from FILE
 
       <b><i>-r</i></b>, <b><i>--reverse
</i></b>	      reverse the result of comparisons
 
       <b><i>--sort=WORD
</i></b>	      sort according to WORD: general-numeric <b><i>-g</i></b>,  month  <b><i>-M</i></b>,  numeric
	      <b><i>-n</i></b>, random <b><i>-R</i></b>, version <b><i>-V
 
</i></b>       <b><i>-V</i></b>, <b><i>--version-sort
</i></b>	      natural sort of (version) numbers within text
 
       Other options:
 
       <b><i>--batch-size=NMERGE
</i></b>	      merge at most NMERGE inputs at once; for more use temp files
 
       <b><i>-c</i></b>, <b><i>--check</i></b>, <b><i>--check=diagnose-first
</i></b>	      check for sorted input; do not sort
 
       <b><i>-C</i></b>, <b><i>--check=quiet</i></b>, <b><i>--check=silent
</i></b>	      like <b><i>-c</i></b>, but do not report first bad line
 
       <b><i>--compress-program=PROG
</i></b>	      compress temporaries with PROG; decompress them with PROG <b><i>-d
 
</i></b>       <b><i>--files0-from=F
</i></b>	      read  input  from the files specified by NUL-terminated names in
	      file F; If F is - then read names from standard input
 
       <b><i>-k</i></b>, --key=POS1[,POS2]
	      start a key at POS1 (origin 1), end it at POS2 (default  end  of
	      line)
 
       <b><i>-m</i></b>, <b><i>--merge
</i></b>	      merge already sorted files; do not sort
 
       <b><i>-o</i></b>, <b><i>--output=FILE
</i></b>	      write result to FILE instead of standard output
 
       <b><i>-s</i></b>, <b><i>--stable
</i></b>	      stabilize sort by disabling last-resort comparison
 
       <b><i>-S</i></b>, <b><i>--buffer-size=SIZE
</i></b>	      use SIZE for main memory buffer
 
       <b><i>-t</i></b>, <b><i>--field-separator=SEP
</i></b>	      use SEP instead of non-blank to blank transition
 
       <b><i>-T</i></b>, <b><i>--temporary-directory=DIR
</i></b>	      use  DIR	for temporaries, not $TMPDIR or /tmp; multiple options
	      specify multiple directories
 
       <b><i>-u</i></b>, <b><i>--unique
</i></b>	      with <b><i>-c</i></b>, check for strict ordering; without <b><i>-c</i></b>, output only  the
	      first of an equal run
 
       <b><i>-z</i></b>, <b><i>--zero-terminated
</i></b>	      end lines with 0 byte, not newline
 
       <b><i>--help</i></b> display this help and exit
 
       <b><i>--version
</i></b>	      output version information and exit
 
       POS  is	F[.C][OPTS],  where  F is the field number and C the character
       position in the field; both are origin 1.  If neither <b><i>-t</i></b> nor <b><i>-b</i></b>	is  in
       effect,	characters  in	a  field are counted from the beginning of the
       preceding whitespace.  OPTS  is	one  or  more  single-letter  ordering
       options,  which	override  global ordering options for that key.  If no
       key is given, use the entire line as the key.
 
       SIZE may be followed by the following multiplicative suffixes: % 1%  of
       memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.
 
       With no FILE, or when FILE is -, read standard input.
 
       ***  WARNING  ***  The locale specified by the environment affects sort
       order.  Set LC_ALL=C to get the traditional sort order that uses native
       byte values.
 
<b>AUTHOR</b> 
       Written by Mike Haertel and Paul Eggert.
 
<b>REPORTING BUGS</b> 
       Report sort bugs to bug-coreutils@gnu.org
       GNU coreutils home page: https://www.gnu.org/software/coreutils/
       General help using GNU software: https://www.gnu.org/gethelp/
 
<b>COPYRIGHT</b> 
       Copyright  (C)  2009  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to	change	and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.
 
<b>SEE ALSO</b> 
       The  full documentation for sort is maintained as a Texinfo manual.  If
       the info and sort programs are properly installed  at  your  site,  the
       command
 
	      info coreutils 'sort invocation'
 
       should give you access to the complete manual.
 
<b>GNU coreutils 7.4</b>		 October 2009			       
</pre>


<p>
The command that promped me to record this episode
<pre>
cat camera-x.txt | sed 's[Camera Model Name               : [[g'| \
awk -F ';' '{print $2" "$1}' | \
sort -i -b -k1,1 -u | \
grep -v "^ "
</pre>
</p>