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Increasing a number and appending it to next line of a text file

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# 1  
Old 12-23-2010
Increasing a number and appending it to next line of a text file
Hi all,

I have text file having a number P100. what i need is when i run a script, it should add 1 to the above number and append it to the next line of a same text file.. when i use the script next time it should check the last line and add 1 to the last number and so on..

like the text file should something like below after several runs of a script..

Quote:
P100
P101
P102
P103 and so on...
Pls help me..

Thank you
# 2  
Old 12-23-2010
Code:
awk -FP '{no=$2;print;}END{no++;print "P"no >> file}' file=inputFile inputFile

# 3  
Old 12-23-2010
Or:
Code:
lastline=$(tail -1 file)
echo "$lastline" |awk '{sub("^P",""); print "P" ++$0}' >> file

# 4  
Old 12-23-2010
Quote:
Originally Posted by Franklin52
Or:
Code:
lastline=$(tail -1 file)
echo "$lastline" |awk '{sub("^P",""); print "P" ++$0}' >> file


after the first iteration when i try to run the script again it shows the last like is P100P101
# 5  
Old 12-23-2010
Franklin52's command may be rewritten as:
Code:
tail -1 file | awk '{sub("^P",""); print "P" ++$0}' >> file

Also this command should work.
Pls try again, if doesn't work, post the file content before and after running command. command also.
# 6  
Old 12-23-2010
yes working fine... thank you Franklin and Anurag
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