diff --git a/check-yamal_sh.sh b/check-yamal_sh.sh
new file mode 100755
index 0000000..3a27852
--- /dev/null
+++ b/check-yamal_sh.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+# Code by Javier E. Perez P. <javier.perez@entelgy.com>
+# Last update: 2017-04-20
+if [ $# -lt 1 ]; then
+        echo "Must specify at least one YAML file as argument"
+else
+        python -c 'import yaml, sys; print yaml.load(sys.stdin)' < $1
+        if [ $? -eq 0 ]; then
+                echo "Well formatted file"
+        else
+                echo "BAD formatted file"
+        fi
+fi
diff --git a/docs/faq-ec2-en.pdf b/docs/faq-ec2-en.pdf
new file mode 100644
index 0000000..e08d18a
Binary files /dev/null and b/docs/faq-ec2-en.pdf differ
diff --git a/docs/faq-s3-en.pdf b/docs/faq-s3-en.pdf
new file mode 100644
index 0000000..3eebae1
Binary files /dev/null and b/docs/faq-s3-en.pdf differ
diff --git a/extensiones-unicas.sh b/extensiones-unicas.sh
index eb9ba17..f566dae 100755
--- a/extensiones-unicas.sh
+++ b/extensiones-unicas.sh
@@ -4,3 +4,5 @@ find . -type f |egrep '^./.*\.' |sed -e "s/\(^.*\.\)\(.*$\)/\2/" |sort |uniq
 # un simulacro para hacer lo mismo (pero no hace lo mismo) 
 # --------------------------------------------------------
 # find . -type f |awk -F'.' '{print $NF}' |sort |uniq
+
+# new comment
diff --git a/hora.sh b/hora.sh
old mode 100644
new mode 100755
diff --git a/screen_ts_ocr_img2txt b/screen_ts_ocr_img2txt
new file mode 100755
index 0000000..b405bbc
--- /dev/null
+++ b/screen_ts_ocr_img2txt
@@ -0,0 +1,18 @@
+#!/bin/bash 
+# taken from: https://askubuntu.com/questions/280475/how-can-instantaneously-extract-text-from-a-screen-area-using-ocr-tools
+# Dependencies: tesseract-ocr imagemagick scrot xsel
+
+select tesseract_lang in eng rus equ ;do break;done
+# quick language menu, add more if you need other languages.
+
+SCR_IMG=`mktemp`
+trap "rm $SCR_IMG*" EXIT
+
+scrot -s $SCR_IMG.png -q 100    
+# increase image quality with option -q from default 75 to 100
+
+mogrify -modulate 100,0 -resize 400% $SCR_IMG.png 
+#should increase detection rate
+
+tesseract $SCR_IMG.png $SCR_IMG &> /dev/null
+cat $SCR_IMG.txt | xsel -bi
diff --git a/yaml2json.sh b/yaml2json.sh
new file mode 100755
index 0000000..69b0165
--- /dev/null
+++ b/yaml2json.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+ruby -ryaml -rjson -e 'puts JSON.pretty_generate(YAML.load(ARGF))'