makeMarkDown.sh

#!/bin/sh
today=$(date +"%Y-%m-%d %T")
RUN_FILE="files/run.sh"
cp README_HEADER.md README_HEADER_TMP.md
for image in nginx 
do
    echo "## $image docker ENV settings" >README_TAIL.md
    echo "###### made date at $today " >>README_TAIL.md
    cat $RUN_FILE  | grep ^export  | cut -d "=" -f 1 | sed 's/export//g' | sed 's/_/\\_/g' > text1
    cat $RUN_FILE | grep ^export  | cut -d ":" -f2 | sed -E 's/-|}|"//g'  | cut -d "#" -f1  | sed 's/_/\\_/g' > text2
    cat $RUN_FILE | grep ^export | grep -v except| cut -d "-" -f2 | cut -d "#" -f2 | sed 's/ *$//'| sed -E 's/-$|}$|"//g'  | sed 's/_/\\_/g'  > text3
    cat $RUN_FILE | grep ^export | grep -v except| cut -d "-" -f2 |  awk -F"#" '{print $3}'|sed -E 's/-$|}$|"//g'  | sed 's/_/\\_/g'| sed 's/\|/\\|/'| sed -e 's/$/\|/' > text4
    echo "| Environment variable | Description|Default value| Allowed value|" >>README_TAIL.md
    echo "|--------|--------|-------|-------|"     >>README_TAIL.md
    paste -d "|" text1  text3 text2  text4      >>README_TAIL.md
done

cat README_HEADER_TMP.md  > README.md
echo "" >> README.md
cat README_TAIL.md  >> README.md

rm -f text1 text2 text3 text4 README_HEADER_TMP.md README_TAIL.md