Split utils some more, start reorganizing make, move library to assembly

Author: cirosantilli

README.md

@@ -77,10 +77,13 @@ Includes Linux concepts and utilities that work on Linux, not necessarily in the
     1. [cut](cut.sh)
     1. [Eclipse](eclipse.md)
     1. [expand](expand.md)
+    1. [fold](fold.md)
     1. [paste](paste.md)
     1. [printf](printf.sh)
     1. [sed](sed.sh)
+    1. [strings](strings.md)
     1. [tabs](tabs.md)
+    1. [uniq](uniq.md)
     1. [wc](wc.md)
 1.  Binary data viewers
     1. [hd](hd.md)
@@ -92,26 +95,23 @@ Includes Linux concepts and utilities that work on Linux, not necessarily in the
     1. [diff](diff.md)
     1. [wdiff](diff.md)
 1.  Files, directories
-    1. [cp](cp.sh)
-    1. [dd](dd.md)
-    1. [du](du.md)
-    1. [fdupes](fdupes.md)
-    1. [find](find.md)
-    1. links
+    1.  [cp](cp.sh)
+    1.  [dd](dd.md)
+    1.  [du](du.md)
+    1.  [fdupes](fdupes.md)
+    1.  [find](find.md)
+    1.  links
         1. [ln](ln.md)
         1. [readlink](readlink.md)
         1. [realpath](realpath.md)
-    1. [locate](locate.md)
-    1. [ls](ls.md)
-    1. [read](read.md)
-    1. [stat](stat.md)
-    1. [tree](tree.md)
+    1.  [locate](locate.md)
+    1.  [ls](ls.md)
+    1.  [read](read.md)
+    1.  [stat](stat.md)
+    1.  [tree](tree.md)
 1.  File managers
     1. [Krusader](krusader.md)
     1. [vifm](vifm.md)
-1.  [Compilation and libraries](compile.md)
-    1. [GDB](gdb.md)
-    1. [Library](library.md)
 1.  Programming
     1. [ack](ack.sh)
     1. [ctags](ctags/)
@@ -193,15 +193,23 @@ Includes Linux concepts and utilities that work on Linux, not necessarily in the
     1. [chef](chef/)
     1. [puppet](puppet.md)
 1.  Printing
-    1. [CUPS](cups.md)
+    1.  [CUPS](cups.md)
         1. [lp](lp.md)
         1. [lpstat](lpstat.md)
         1. [lpoptions](lpoptions.md)
         1. [system-config-printer](system-config-printer.md)
+1.  Math
+    1.  [bc](bc.md)
+    1.  [factor](factor.md)
+    1.  [primes](primes.md)
+    1.  [seq](seq.md)
+    1.  [shuf](shuf.md)
+    1.  Sorting
+        1. [sort](sort.md)
+        1. [tsort](tsort.md)
 1.  Misc
     1. [cron](cron.sh)
     1. [logrotate](logrotate.md)
-    1. [factor](factor.md)
     1. [xargs](xargs.md)
 1.  [Bibliography](bibliography.md)
 

awk.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# POSIX 7. <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html>
+# POSIX 7. http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html
 
 # Turing Machine, but use only for *ultra simple* POSIX text table field manipulation:
 # it only has better golfing on that very limited problem set.
@@ -46,7 +46,7 @@
     #CONDITION_N  { STATEMENT_N   }
     #END      { STATEMENT_END  }
 
-  echo $'1 2\n3 4' | awk 'BEGIN{print "b"}1<2{print "l"}1<2{print "l2"; print "l3"}1>2{print "l4"}END{print "e"}'
+  printf '1 2\n3 4' | awk 'BEGIN{print "b"}1<2{print "l"}1<2{print "l2"; print "l3"}1>2{print "l4"}END{print "e"}'
   #$'b\nl\nl2\nl3\nl\nl2\nl3\ne
 
   echo '0.5 0.5' | awk '{print $1+$2}'
@@ -63,11 +63,11 @@
   awk 'BEGIN{print "a", 1}'
     #'a 1'
       #by default, print does space separation
-  awk 'BEGIN{print "a"."b"}'
+  awk 'BEGIN{print "a" "b"}'
     #'ab'
       #string concat
-  awk '{print}'
-    #cat
+
+    [ "$(echo 'a' | awk '{print}')" = 'a' ] || exit 1
 
 ## applications
 
@@ -81,8 +81,25 @@
 
   # Same as above, but print only first match:
 
-    [ "$(echo $'1 a\n2 b\n1 c' | awk '$1 == 1 { print $2; exit }')" = a ] || exit 1
+    [ "$(printf '1 a\n2 b\n1 c\n' | awk '$1 == 1 { print $2; exit }')" = 'a' ] || exit 1
 
   # Same as above, but match EREs:
 
-    [ "$(echo $'1 a\n2 b\n1 c' | awk '$1 ~/^1$/ { print $2; exit }')" = a ] || exit 1
+    [ "$(printf '1 a\n2 b\n1 c\n' | awk '$1 ~/^1$/ { print $2; exit }')" = 'a' ] || exit 1
+
+## RS
+
+  # Record separator.
+
+  # `''` is a special value that selects blank lines, i.e. paragraphs:
+  # http://unix.stackexchange.com/questions/82944/how-to-grep-for-text-in-a-file-and-display-the-paragraph-that-has-the-text/82958#82958
+
+    [ "$(printf '1 a0\na1\na2\n\nb0\nb1\nb2\n\nc0\nc1\nc2\n' | awk -v RS='' '/b1/')" = "$(printf 'b0\nb1\nb2')" ] || exit 1
+
+## Subtract adjacent lines
+
+  # TODO fails if the first is zero.
+
+    #[ "$(printf '0\n1\n3\n6' | awk awk 'p{print $0-p}{p=$0}')" = "$(printf '1\n2\n3')" ] || exit 1
+
+echo 'ALL ASSERTS PASSED'

bc.md

@@ -1,14 +1,14 @@
 # bc
 
-POSIX
+POSIX: <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html>
 
 Simple interpreted language, calculator focus.
 
-Cute toy language that only exists because it is POSIX =),
-but is completely superseded by any modern interpreted language,
-and only golfs very slightly better than Python.
+Cute toy language that only exists because it is POSIX =)
 
-C like syntax.
+Completely superseded by any modern interpreted language, and only golfs very slightly better than Python, which also has arbitrary precision calculation out of the box.
+
+C-like syntax.
 
 Features: variable definition, function definition, arrays, strings
 

cups.md

@@ -10,7 +10,9 @@ Port: 631 TCP and UDP.
 
 You can also visit: <http://localhost:631/> to see a web front-end for CUPS. TODO check: is it standard? Works on Ubuntu 14.04.
 
-Configuration files:
+## Ink levels
+
+Not possible with CUPS apparently. Consider `ink`.
 
 ## Bibliography
 

dot/Makefile

@@ -1,19 +1,19 @@
 IN_EXT := .dot
 OUT_EXT := .dot
 
-INS 		:= $(wildcard *$(IN_EXT))
-OUTS_SVG	:= $(patsubst %$(IN_EXT),%.svg,$(INS))
-OUTS_PNG	:= $(patsubst %$(IN_EXT),%.png,$(INS))
+INS := $(wildcard *$(IN_EXT))
+OUTS_SVG := $(patsubst %$(IN_EXT),%.svg,$(INS))
+OUTS_PNG := $(patsubst %$(IN_EXT),%.png,$(INS))
 
 .PHONY: all clean
 
 all: $(OUTS_SVG) $(OUTS_PNG)
 
 %.svg: %$(IN_EXT)
-	dot -Tsvg "$<" > "$@" 
+	dot -Tsvg '$<' > '$@'
 
 %.png: %$(IN_EXT)
-	dot -Tpng "$<" > "$@" 
+	dot -Tpng '$<' > '$@'
 
 clean:
 	rm *.svg *.png

dot/digraph.dot

@@ -1,7 +1,5 @@
 // # Directed graph.
 digraph graphname {
-    3 -> 1;
     1 -> 0;
     1 -> 2;
-    3 -> 4;
 }

factor.md

@@ -1,7 +1,7 @@
 # factor
 
-Coreutils.
+Coreutils: <https://www.gnu.org/software/coreutils/manual/html_node/factor-invocation.html>
 
 Factor a number into prime constituents.
 
-    [ "`factor 30`" = "30: 2 3 5" ] || exit 1
+    [ "$(factor 30)" = '30: 2 3 5' ] || exit 1

fold.md

@@ -0,0 +1,11 @@
+# fold
+
+POSIX 7: <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/fold.html>
+
+Wrap lines:
+
+    [ "$(printf "aaaa\nbb" | fold -w 3)" = "$(printf 'aaa\na\nbb\n')" ] || exit 1
+
+`-s`: only break at spaces:
+
+    [ "$(printf "12345 6\n" | fold -s -w 3)" = "$(printf '123\n45 \n6\n')" ] || exit 1

game.md

@@ -84,18 +84,6 @@ Displays the phase of the moon.
 
     [ "$(echo 'abc' | rot13)" = 'nop' ] || exit 1
 
-#### primes
-
-Print primes between 1 to 100:
-
-    primes 1 100
-
-Count primes:
-
-    primes 1 100 | wc -l
-
-`factor` is not included here as it is part of coreutils.
-
 #### robots
 
 Very simple, fun, but too much luck.

ink.md

@@ -0,0 +1,9 @@
+# ink
+
+Check printer ink levels.
+
+CLI front-end for libinklevel.
+
+Works for many printers, but not all.
+
+TODO usage