initial version

README.md

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+# doc4sh
+
+This a collection of scripts that could be a Ghist each.
+
+## `get_comments`
+
+During my _Unix_ course, this is one of the exercice I ask my students in
+in order to start playing with `grep`: 
+"Using only grep, write a script that will extract from a given shell script,
+after checking the file argument, all comments that start at firsh column."
+

get_comments

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+#!/bin/sh
+
+# readable file requiered
+grep -q "" "$1" || exit 1
+
+# extract comments 
+grep '^#' "$1" | cut -c 2- 
+

test0_txt

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+make this file unreadable to all,
+but writable by user and it's group
+(so one can echo test into it...)
+> chmod 0220 test0_txt
+

test1_sh

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+#!/bin/sh
+# Shell script test
+############################
+# 1. Ask for name
+printf "Who are you? " # 1.1 print question
+read name # 1.2 read answer
+# 2. Warm salutions
+printf "\nHello %s\n" "$name" # 2.1. say hello
+printf "\nI am %s\n" "$(uname -n)" # 2.2 introduce yourself
+printf "\nToday is %s\n\n" "$(date +%D)" # 2.3 a memorable day
+# 3 So shy
+sleep 15 # 3.1 nothing to say...
+echo See you # 3.2 say goodbye

test1_txt

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+make this text file readable by everyone
+> chmod 0664 test1_txt
+but it should have any hash sign somewhere
+> sed -i '/#/d' test1_txt