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--- awk [2017/01/22 18:28]
+++ awk [2022/04/16 12:22] (current)
@@ Line 1: / Line 1: @@
+@tag : [[Shell]] [[Sed]] [[Script]] [[ruby]]
+  * http://www.gnu.org/manual/gawk/html_node/index.html
+  awk '{ print "../" $0 }' < filelist.txt
+Variables :
+  uname -a | awk -v h=$HOSTNAME '{ print h ":" $0 }'
+  dpkg-query -Wf '${Installed-Size}\t${Package}\n' | sort -n | awk '{ SUM += $1} END { print SUM/1024/1024 }'
+Arrays:
+  history | awk '{a[$2]++ } END { for(i in a){print a[i] " " i}}' | sort -rn | head
+filter :
+    cat "$1"  \
+	| awk -v t=0 't==1 { print $0 } '"/${from}/"'{print $0; t=1}  ' \
+	| awk -v t=0 "/${to}/{t=1}"'t==0 { print $0 }' \
+    > "$1.tmp"
+==== regex ====
+<code>
+ echo -e '{\n{\n}\n}' | awk -v l=O ' '"/{/"'{++l; print $0 l; }  '"/}/"'{ --l; print $0 l; }  '
+ echo -e '{\n{\n}\n}' | awk -v l=3 '{for (i = 0 ; i <= l ; i++) printf ",";  printf ".\n" ; }'
+ echo -e '{\n{\n}\n}' | awk -v l=0 '{for (i = 0 ; i < l ; i++) printf "\t";  }  '"/{/"'{++l; print $0 l; }  '"/}/"'{ --l; print $0 l; }  '
+ echo -e '{ one\n{ two\n} two\n} one' | awk -v l=0 '  '"/{/"'{++l; }  {for (i = 0 ; i < l ; i++) printf "\t";  } { print $0 " #" l; } '"/}/"'{ --l; } '
+==== RUBY ====
+  * http://tomayko.com/writings/awkward-ruby
+# thx fb pok:
+ #!/usr/bin/env ruby                                                                                                            │+
+ # Usage: cat source.txt | ./sploup_pipe.rb                                                                                     │+
+ lev = -1; STDIN.each do |line|                                                                                                 │+_
+  puts "\t" * ((open = line =~ /^\{/) ? (lev + 1) : (lev)) + line                                                              │+
+  [  lev = lev.method(open ? :+ : :-).call 1                                                                                      │+
+  : end
+lev = -1; $<.each{|line| puts "\t" * ((open = line =~ /^\{/) ? (lev + 1) : (lev)) + line; lev = lev.method(open ? :+ : :-).call 1}
+</code>
+===== MORE =====
+   * https://ia802309.us.archive.org/25/items/pdfy-MgN0H1joIoDVoIC7/The_AWK_Programming_Language.pdf# EBooK
+   * https://github.com/thewhitetulip/awk-anti-textbook/blob/master/manuscript/0.0firststeps.md# LearN