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Full Discussion: How to insert text within a file?
Top Forums Shell Programming and Scripting How to insert text within a file? Post 302947429 by newbie_01 on Thursday 18th of June 2015 02:29:37 AM
Old 06-18-2015
How to insert text within a file?
Hi,

I am trying to check for missing dates in a file and would want to insert the missing date into the file.

Currently the script is as below

Code:
#!/bin/ksh

dates="dates"
cat ${dates} | grep -v "^#"

curr_month=`date '+%m`
curr_day=`date '+%d`
curr_year=`date '+%Y`

#curr_month=02
#curr_month=2016
#leap=${curr_year}; math=`echo "$leap%4" | bc`; [ ! -z $leap ] && [ $math -eq 0 ] && echo "$leap is a leap year!" || echo "$leap isn't a leap year";
leap=${curr_year}; math=`echo "$leap%4" | bc`; [ ! -z $leap ] && [ $math -eq 0 ] && leapyear="Y" || leapyear="N";

case "${curr_month}" in
   01|03|05|07|08|10|12 )
      max_days="31"
      ;;
   04|06|09|11 )
      max_days="30"
      ;;
   02 )
      case "${leapyear}" in
         Y )
            max_days=29
            ;;
         N )
            max_days=28
            ;;
      esac
      ;;
esac

echo
echo "curr_month = ${curr_month}"
echo "curr_day   = ${curr_day}"
echo "curr_year  = ${curr_year}"
echo "leapyear   = ${leapyear}"
echo "max_days   = ${max_days}"
echo

check_day=${curr_day}
while [[ ${check_day} -le ${max_days} ]]
do
   next_date="${curr_year}-${curr_month}-${check_day}"

   if [[ -z "`grep ${next_date} ${dates}`" ]] ; then
      echo "- Missing date ---> ${next_date}"
   fi

   let check_day=${check_day}+1
done

A sample run of the script gives output as below:

Code:
$ ./x.ksh
2015-05-01
2015-05-04
2015-05-05
2015-05-06
2015-05-07
2015-05-08
2015-05-12
2015-05-14
2015-05-15
2015-05-18
2015-05-27
2015-06-02
2015-06-03
2015-06-04
2015-06-05
2015-06-06
2015-06-07
2015-06-08
2015-06-09
2015-06-10
2015-06-11
2015-06-12
2015-06-13
2015-06-14
2015-06-15
2015-06-18
2015-06-22
2015-06-23
2015-06-24
2015-06-26
2015-06-30
2015-07-01

curr_month = 06
curr_day   = 18
curr_year  = 2015
leapyear   = N
max_days   = 30

- Missing date ---> 2015-06-19
- Missing date ---> 2015-06-20
- Missing date ---> 2015-06-21
- Missing date ---> 2015-06-25
- Missing date ---> 2015-06-27
- Missing date ---> 2015-06-28
- Missing date ---> 2015-06-29

I want to insert the missing date into the file in the right ascending order.

Any advice will be much appreciated. Thanks in advance.
 

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LEARN ABOUT DEBIAN

dp

DP(8)								     [nmh-1.5]								     DP(8)

NAME

       dp - parse dates 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...

DESCRIPTION

       Dp  is  a  program that parses dates according to the ARPA Internet standard.  It also understands many non-standard formats, such as those
       produced by TOPS-20 sites and some UNIX sites using ctime(3).  It is useful for seeing how nmh will interpret a date.

       The dp program treats each argument as a single date, and prints the date out in the official 822-format.  Hence, it  is  usually  best	to
       enclose each argument in quotes for the shell.

       To  override  the  output  format  used by dp, the -format string or -format file switches are used.  This permits individual fields of the
       address to be extracted with ease.  The string is simply a format string and the file is simply a format file.  See  mh-format(5)  for  the
       details.

       Here is the default format string used by dp:

	    %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>

       which  says  that  if an error was detected, print the error, a `:', and the date in error.  Otherwise, output the 822-proper format of the
       date.

FILES

       $HOME/.mh_profile	  The user profile

PROFILE COMPONENTS

       None

SEE ALSO

       ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)

DEFAULTS

       `-format' default as described above
       `-width' default to the width of the terminal

CONTEXT

       None

BUGS

       The argument to the -format switch must be interpreted as a single token by the shell that invokes dp.  Therefore, one must  usually  place
       the argument to this switch inside quotes.

MH.6.8								   11 June 2012 							     DP(8)
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