decrease number by 1 in text file


 
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# 1  
Old 04-18-2010
Power decrease number by 1 in text file

i have text file which contains number like 234565
i need a shell script or command which decrease number by 1 in text file.
pls
# 2  
Old 04-18-2010
Code:
 awk '{printf("%d\n",$1-1)}' numbers.txt

# 3  
Old 04-18-2010
Code:
awk '$1=NF?$NF-1:X' file

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