UNIX for Dummies Questions & Answers

Hi I have the below file
Name=abc
Yr=2011
Mon=05

My script should be in such a way that whenever I run it then
Month should increment by 1 and if the month is 12 then when
I run the script then year should incremented by 1 and month
Should become 01(I.e jan)

Thanks for the help in advance

---------- Post updated at 01:06 PM ---------- Previous update was at 12:01 PM ----------

sorry if I did not mention my requirement properly
Please refer the below scenarios

Scenario 1
================
source file
-----------
Name=abc
Yr=2011
Mon=05

desired output after 1st run of the script
---------------------------------------
Name=abc
Yr=2011
Mon=06


Scenario 2
============================
source file
-----------
Name=abc
Yr=2011
Mon=12

desired output after 1st run of the script
---------------------------------------
Name=abc
Yr=2013
Mon=01

so my requirement is that everytime when I run the script then the month should be incremented by 1 and if month is 12 in the source file then after running the script year should be incremented by 1 and month should become 1.

Please help me

Code:

#!/usr/bin/ksh
typeset -i mYYYY=$(sed -n 's/Yr=//p' input_file)
typeset -i mMM=$(sed -n 's/Mon=//p' input_file)
if [[ ${mMM} -eq 12 ]]; then
  mMM=1
  mYYYY=${mYYYY}+1
else
  mMM=${mMM}+1
fi
sed -e "s/Yr=.*/Yr=${mYYYY}/" -e "s/Mon=.*/Mon=${mMM}/" input_file

Thank you very much
its working fine but only problem is that month is coming as single digit i.e. if it is "05" after running the script it is updated as as "6" but i need it to be "06"

Try this one:

Code:

#!/usr/bin/ksh
typeset -i mYYYY=$(sed -n 's/Yr=//p' input_file)
typeset -i mMM=$(sed -n 's/Mon=//p' input_file)
if [[ ${mMM} -eq 12 ]]; then
  mMM=1
  mYYYY=${mYYYY}+1
else
  mMM=${mMM}+1
fi
mMM2=$(printf "%.2d" ${mMM})
sed -e "s/Yr=.*/Yr=${mYYYY}/" -e "s/Mon=.*/Mon=${mMM2}/" input_file

Thank you very much Its working
need final help,
I need to UPDATE the file with these changes i.e,source file needs to be updated with these new values after the script runs.

Here is one way of updating the file:

Code:

...
sed -e "s/Yr=.*/Yr=${mYYYY}/" -e "s/Mon=.*/Mon=${mMM2}/" input_file > tmp_file
mv tmp_file > input_file

Yup...Its working very well...
thank you very much for the help...
today i learned few things in UNIX,
thank you once again