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how to delete lines from a file which starts with a specific pattern

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# 1  
Old 12-02-2010
Question how to delete lines from a file which starts with a specific pattern
I need to delete those lines from a file, which starts with 45.
How to do it?
# 2  
Old 12-02-2010
thru sed..
Code:
sed '/^45/d' inputfile > outfile

# 3  
Old 12-02-2010
Code:
 # delete lines matching pattern
 sed '/pattern/d'

in your case

Code:
sed -i '/^45/d' infile > outfile

# 4  
Old 12-02-2010
Code:
grep -v '^45' infile > outfile

or:
Code:
awk '!/^45/'  infile > outfile

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