Shell Programming and Scripting

VALUEA
2017-01-01
Lores ipsum
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VALUEB
2017-02-02
...

#SETTINGSBEGIN VALUEA
#DATEA 2017-01-01
...
#DATEB 2017-10-28
TEXT
...
#SETTINGSEND

#SETTINGSBEGIN VALUEB
#DATEA 2017-02-02
...
#DATEB 2017-11-29
TEXT
...
#SETTINGSEND

#SETTINGSBEGIN VALUEС
#DATEA 2017-03-03
...
#DATEB 2017-12-28
TEXT
...
#SETTINGSEND

gawk -v ADD_DAYS=300 '
 /#DATEA/ {
   DT = mktime(gensub(/-/, " ", "g", $2) " 0 0 0")
   DT += 24*60*60*ADD_DAYS
 }
 /#TEXT/ {
   print strftime("#DATEB %Y-%m-%d", DT)
 }
 1' settings.txt > settings_new.txt

#!/bin/bash
ADD_DAYS=300
while read line
do
    [[ "$line" = [#]DATEA\ * ]] && DB=$(date -d "${line#*DATEA } + ${ADD_DAYS}days" +%Y-%m-%d)
    [[ "$line" = [#]TEXT ]] && echo "#DATEB $DB"
    echo "$line"
done < settings.txt > settings_new.txt

gawk -v ADD_DAYS=300 '
/#DATEA/ {
  DT = mktime(gensub(/-/, " ", "g", $2) " 0 0 0")
  DT += 24*60*60*ADD_DAYS
  printf "VALUEA\n%s\n", $2
}
/#VALUE TITLE/ { print gensub(/.*"([^"]+)"/, "\\1","g") }
/#SETTINGSEND/ { print strftime("\nVALUEB\n%Y-%m-%d", DT) }
!/^#/' settings.txt

#!/bin/bash
ADD_DAYS=300
while read line
do
    if [[ "$line" = \#DATEA\ * ]]
    then
       DA=${line#*DATEA }
       DT=$(date -d "$DA + ${ADD_DAYS}days" +%Y-%m-%d)
       printf "VALUEA\n%s\n" "$DA"
    fi
    if [[ "$line" = \#VALUE\ TITLE=* ]]
    then
        line=${line%\"}
        echo "${line#*\"}"
    fi
    [[ "$line" = \#SETTINGSEND* ]] && printf "\nVALUEB\n%s\n" "$DT"
    [[ "$line" = \#* ]] || echo "$line"
done < settings.txt

#!/bin/bash
ADD_DAYS=300
while read line
do
    case "$line" in
        [#]DATEA\ *)
           DA=${line#*DATEA }
           DT=$(date -d "$DA + ${ADD_DAYS}days" +%Y-%m-%d)
           printf "VALUEA\n%s\n" "$DA" ;;
        [#]VALUE\ TITLE=*)
            line=${line%\"}
            echo "${line#*\"}" ;;
        [#]SETTINGSEND*) printf "\nVALUEB\n%s\n" "$DT" ;;
        [#]*) ;;
        *) echo "$line" ;;
    esac
done < settings.txt